Example Domain Name

The following example illustrates the difference between a URL (Uniform Resource Locator) and a domain name:
URL: http://www.example.net/index.html
Domain name: www.example.net
Registered domain name: example.net

As a general rule, the IP address and the server name are interchangeable. For most Internet services, the server will not have any way to know which was used. However, the explosion of interest in the Web means that there are far more Web sites than servers. To accommodate this, the hypertext transfer protocol (HTTP) specifies that the client tells the server which name is being used. This way, one server with one IP address can provide different sites for different domain names. This feature goes under the name virtual hosting and is commonly used by Web hosts.

For example, as referenced in RFC 2606 (Reserved Top Level DNS Names), the server at IP address 192.0.34.166 handles all of the following sites:
example.com
www.example.com
example.net
www.example.net
example.org
www.example.org

When a request is made, the data corresponding to the hostname requested is served to the user.

Overview

The most common types of domain names are hostnames that provide more memorable names to stand in for numeric IP addresses. They allow for any service to move to a different location in the topology of the Internet (or an intranet), which would then have a different IP address.

By allowing the use of unique alphabetical addresses instead of numeric ones, domain names allow Internet users to more easily find and communicate with web sites and other server-based services. The flexibility of the domain name system allows multiple IP addresses to be assigned to a single domain name, or multiple domain names to be assigned to a single IP address. This means that one server may have multiple roles (such as hosting multiple independent Web sites), or that one role can be spread among many servers. One IP address can also be assigned to several servers, as used in anycast and hijacked IP space.

Hostnames are restricted to the ASCII letters "a" through "z" (case-insensitive), the digits "0" through "9", and the hyphen, with some other restrictions. Registrars restrict the domains to valid hostnames, since, otherwise, they would be useless. The Internationalized domain name (IDN) system has been developed to bypass the restrictions on character allowances in hostnames, making it easier for users of non-English alphabets to use the Internet. The underscore character is frequently used to ensure that a domain name is not recognized as a hostname, for example with the use of SRV records, although some older systems, such as NetBIOS did allow it. Due to confusion and other reasons, domain names with underscores in them are sometimes used where hostnames are required.

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Whether it's Windows, Unix, Mac, Novel, or Linux platform on a failed hard disk drive, NAS, RAID server, laptop, DLT, ZIP, or Jaz disks device, DataRAID engineers and technicians can help. We develop and use state-of-the-art tools and techniques to recover your critical data and because we develop our own tools we can recover from situations that most other companies simply cannot. In addition to working with a leader and receiving the best customer service and support in the industry, here is what you can expect as a DataRAID client:
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Hard Drive and RAID Data Recovery Services & Software Tools

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Virtual web hosting FAQ

How does APNIC evaluate assignments for virtual web hosting?

APNIC strongly encourages name-based web hosting. If you don't plan to provide name-based hosting, you must provide technical justification.

If you assign more than a /22 for IP-based web hosting, then the next time you request address space from APNIC, you will be required to list each of the IP addresses assigned for web hosting and their corresponding URLs.

The decision to encourage name-based web hosting and strongly discourage IP-based hosting is the result of a discussion paper and vote held during APRICOT 2000 in Seoul, Korea.

Top of page
What is virtual web hosting?

Virtual web hosting refers to the process of running multiple "virtual" web servers on a single physical host computer. Using this technique, a single computer can host thousands of independent web sites. Commercial web hosting service providers often use this technique to allow better manageability, efficiency and scalability of their service infrastructure.

Most virtual web hosting applications rely on virtual DNS resolution, so that a specific domain name (such as a customer's own registered domain name) may be associated with each independent virtual web server. This can be achieved through either name-based or IP-based virtual web hosting. These techniques are explained below.

Top of page
What is name-based web hosting?

Name-based web hosting is a technique that can be used when providing virtual web hosting services. Each web site that is hosted on a single machine shares a single public IP address. All HTTP GET requests received by this web server are answered according to the domain name supplied by the requesting client, enabling the web server to differentiate between multiple virtual sites on the one IP address.

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What is IP-based web hosting?

IP-based hosting is a technique that can be used when providing virtual web hosting services. Each web site that is hosted on a single machine is given its own separate public IP address. The HTTP GET requests are resolved by using the IP address instead of the name.

Operating system limitations may also limit the maximum number of IP addresses that can be assigned to a single machine, especially if separate log files are used.

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What is the 'Host:' header field?

The definition of a Host: header is taken from section 14.23 of RFC 2616

The Host request-header field specifies the Internet host and port number of the resource being requested, as obtained from the original URI given by the user or referring resource (generally an HTTP URL, as described in section 3.2.2). The Host field value MUST represent the naming authority of the origin server or gateway given by the original URL. This allows the origin server or gateway to differentiate between internally ambiguous URLs, such as the root "/" URL of a server for multiple host names on a single IP address).

Top of page
Under what circumstances is name-based web hosting possible?

Name-based web hosting is generally possible for web sites that do not have any special security requirements. For example, name-based hosting would be appropriate for personal web sites or servers that need to be accessible via more than one domain name.

Top of page
Under what circumstances is name-based web hosting not possible?

There are a few technical limitations to name-based hosting. The most common one is some websites requirements of using SSL (Secure Sockets Layer) for e-commerce services, particularly if a separate certificate is used for each virtual domain, and for anonymous login functionality with virtual FTP services.

Top of page
Can browsers that are only HTTP/1.0 compliant view websites that are hosted by a name-based virtual hosting system?

Browsers that are HTTP/1.0 compliant can view websites that are hosted by name if their version of the browser issues requests with an additional Host: header field. (This is a required header in HTTP/1.1, but all current HTTP/1.0 browsers also issue this header)

The justification of browsers not being HTTP1.0 compliant is not sufficient to warrant large scale IP-based hosting. Statistics collected by APNIC over a four month period show that almost all browsers visiting www.apnic.net provide the Host: header field (98.9% of HTTP1.0 and 99.8% HTTP1.1).

TOP useful Freeware software!

Office
OpenOffice - office suite
PC Suite 602 - office suite
AbiWord - text editor
Atlantis Nova - text editor
Microsoft PowerPoint Viewer - power point files viewer
Adobe Reader - pdf reader
Foxit PDF Reader - pdf reader
PDFCreator - create pdf documents
Doc Convertor - document convertor
Convert - unit convertor
Converber - unit convertor
Sunbird - calendar/organizer
EssentialPIM Free - calendar/organizer
PhraseExpress - speed up your writing
ATnotes - create notes on the desktop
Archive managers
7-Zip - compression program
IZArc - compression program
TugZIP - compression program
CabPack - compression program
Universal Extractor - extract files from any type of archive

Internet
Firefox - web browser
Internet Explorer- web browser
Maxthon - web browser
Opera - web browser
Avant Browser - web browser
Thunderbird - email client
PopTray - check for emails
Free Download Manager - download manager
FlashGet - download manager
WellGet - download manager
Download Master - download manager
WGET - commandline download manager
HTTrack - offline browser
WebReaper - offline browser
Yeah Reader - RSS reader
GreatNews - RSS reader
RSSOwl - RSS reader
P2P this is sharing files on your computer with someone else.
?Torrent - torrent client
Azureus - torrent client
BitComet - torrent client
ABC - torrent client
BitTornado - torrent client
eMule - p2p client
SoulSeek - p2p client
Shareaza - p2p client
DC++ - Direct Connect network client
PeerGuardian - IP blocker

Chat
Miranda - chat client
MSN Messenger - chat client
Yahoo Messenger - chat client
QIP - chat client
Gaim - chat client
JAJC - chat client
HydraIRC - IRC client
Talkative IRC - IRC client
IceChat - IRC client
Skype - VOIP client
Google Talk - VOIP client
VoipStunt - VOIP client
Gizmo - VOIP client
Wengo - VOIP client

Security
AVG Free - antivirus
Avast Home Free - antivirus
AntiVir PersonalEdition - antivirus
BitDefender Free - antivirus
ClamWin - antivirus
CyberDifender - Internet Security Suite
Ad-aware - anti-spyware
Spybot: Search & Destroy - anti-spyware
Windows Defender - anti-spyware
SpywareBlaster - anti-spyware
Spyware Terminator - anti-spyware
Tootkit Reveaker - rootkit detection utility
Winpooch - system protection
HiJack Free - system protection
HighJackThis - hijackers detector and remover
Kerio Personal Firewall - firewall
Sygate Personal Firewall - firewall
ZoneAlarm - firewall
AxCrypt - file encryption
Simple File Shredder - securely delete files
PuTTy - SSH client
KeePass - password manager
LockNote - password manager
nPassword - password manager
Microsoft Baseline Security Analyzer - identify security misconfigurations

Network
Hamachi - VPN client
RealVNC - remote control
UltraVNC - remote control
Ethereal - local area network administration
The Dude - network administration
Wireshark - network administration
Angry IP Scanner - IP scanner
IP-Tools - IP scanner
Free Port Scanner - IP scanner
NetMeter - network bandwidth monitoring

Servers
FileZilla - FTP client
FileZilla Server - FTP server
EFTP - FTP client/server
XAMPP - integrated server package of Apache, mySQL, PHP and Perl
WAMP - Apache, PHP5 and MySQL server

Audio
Foobar2000 - audio player
WinAmp - audio player
1by1 - audio player
JetAudio - audio player
XMPlay - audio player
Xion - audio player
Apollo - audio player
MediaMonkey - music organizer
The GodFather - music organizer
dBpowerAMP - audio converter
Audacity - audio converter
WavePad - audio converter
Kristal Audio Engine - audio editor
Exact Audio Copy - CD ripper
Audiograbber - CD ripper
CDex - CD ripper
Mp3 Tag Tools - tag editor
Mp3tag - tag editor
Taggin? MP3 - tag editor
Monkey?s Audio - APE compressor/decompressor
mpTrim - mp3 editor
WavTrim - wave editor
EncSpot Basic - analyse mp3 files

Video
Windows Media Player - audio/video player
VLC - video player
Media Player Classic - video player
MV2Player - video player
CrystalPlayer 1.95 - video player
Zoom Player - video player
GOM Player - video player
viPlay - video player
DSPlayer - video player
VirtualDub - video editor
CamStudio - video screen recording
AviSplit - Avi splitter
Video mp3 Extractor - rip audio from video files
Free iPod Converter - convert all popular video formats to iPod video
MediaPortal - turning your PCinto a Media Center
The FilmMachine

Image
Gimp - image editor
PhotoFiltre - image editor
Paint.net - image editor
ArtRage - image editor
Artweaver - image editor
IrfanView - image viewer
Picasa - image viewer
XnView - image viewer
FastStone Image Viewer - image viewer
FuturixImager - image viewer
Easy Thumbnails - create thumbnails from images
JoJoThumb - create thumbnails from images
iWebAlbum - create web photo albums
JAlbum - create web photo albums
3D Box Shot Maker - design quality box shot
FastStone Capture - screen capture
WinSnap - screen capture

3D
Blender3D - 3D renderer
3Delight Free - 3D renderer
SketchUp - 3D modeling
Maya Learning Edition - 3D modeling

Developers
AutoIt - task automation
SciTE4AutoIt3 - text editor for AutoIt
AutoHotkey - task automation
PHP Designer - PHP editor
Notepad++ - text editor
ConTEXT Editor - text editor
PSPad - text editor
FoxEditor - text editor
Crimson Editor - source code editor
Elfima Notepad - text editor
Notepad2 - text editor
Nvu - HTML editor
Alleycode - HTML editor
BlockNote - web page editor
Weaverslave - web page editor

CD/DVD
DeepBurner - CD/DVD burner
CDBurner XP Pro - CD/DVD burner
BurnAtOnce - CD/DVD burner
Express Burn - CD/DVD burner
Zilla CD-DVD Rip?n?Burn - CD/DVD burner
ImgBurn - ISO, BIN burner
Daemon tools - virtual CD/DVD
DVD Decrypter - DVD ripper
DVD Shrink - DVD ripper
Nero CD-DVD Speed - CD/DVD info and quality test


Codecs
GSpot - codec information
AC3Filter - audio codec
Xvid - video codec
QuickTime Alternative - video codec
Real Alternative - video codec
K-Lite Codec Pack - all codecs
System Ulilities
CCleaner - system cleaner
xp-AntiSpy - OS setup
jv16 Powertools - system utilities
XP SysPad - system monitoring utility
What?s Running - process guard
Registrar Lite - registry editor
WinIPConfig - replacement for ?ipconfig.exe? and ?route.exe?
Unlocker - file eraser
Eraser - secure file eraser
Undelete Plus - file recovery
freeCommander - file manager
ExplorerXP - file manager
Duplicate File Finder - find all duplicate files
Ant Renamer - file renaming
ReNamer - file renaming
Icons From File - icos extractor
Chaos MD5 - MD5 generator
HashTab - MD5, SHA1 and CRC-32 file hashes
Rainlendar Lite - desktop calendar
Weather Watcher - weather firecast
Subtitle Workshop - subtitles editor
Ant Movie Catalog - movie organizer
Disclib - CD organizer
Dexpot - virtual desktops
DriveImage XML - create partition images
MozBackup - backup and restore bookmarks, etc.
SyncBack - system backup
Atomic Cock Sync - syncronize your clock
Citrus Alarm Clock - alarm clock
TaskSwitchXP - Alt-Tab replacement
Launchy - application launcher
allSnap - make all windows snap
Sysinternals Tools - various system tools
StrokeIt - mouse gestures
Net Profiles - create profiles of your network settings
ResourceHacker - view, modify, rename, add, delete
Java Runtime Environment - java for Windows

UI Enhancements
RocketDock - application launcher
AveDesk - desktop enhancer
IconPhile - customize windows?s system icons
CursorXP Free - change mouse cursors
MacSound - volume control
LClock - Windows Longhorn clock
Y?z Dock - application launcher
Y?z Shadow - shadow effect to the windows
Y?z Toolbar - change the toolbar icons in Explorer and Internet Explorer
Taskbar Shuffle - rearrange the programs on the taskbar by dragging
Visual Task Tips - thumbnail preview image for each task in the taskbar
Badges - put badges on any folder or file
Folderico - change icons of the folders
Folder Marker - mark your folders
Folder2MyPC - add favourite locations to My Computer
Microsoft TweakUI - system settings
BricoPacks - shell packs
ShellPacks - shell packs
Tango Shell Patcher - shell patcher
XPize - GUI enhancer
Vista Transformation Pack - complete visual style
Vista Sound Scheme - Windows Vista sound scheme
Royale Theme - visual style
Hardware monitoring/Benchmarking
CPU-Z - cpu information
CrystalCPUID - cpu information
Central Brain Identifier - cpu information
Everest - system information
SiSoft Sandra - system information
SpeedFan - hardware monitor
Memtest86 - memory test
PowerMax - HDD test
3Dmark 06 - 3D game performance benchmark
Aquamark - performance benchmark
rthdribl - 3D benchmark
Fraps - 3D benchmark, fps viewer and screen recorder
Prime 95 - cpu benchmarking
SuperPI - cpu benchmarking
CPU Rightmark - cpu overclock
Core Temp - cpu temperature
ATiTool - video overclock
ATI Tray Tools - Radeon tweaker
aTuner - GeForce and Radeontweaker
RivaTuner - video overclock
Nokia Monitor Test - monitor adjustmets
UDPixel - fix dead pixels

Games
123 Free Solitaire - solitaire games collection
Arcade Pack - classic arcade games
Live For Speed - online racing simulator
Enigma - puzzle game
Freeciv - multiplayer strategy game
Tux Racer - race down steep, snow-covered mount?ins

Windows XP Tutorial: 100 Keyboard shortcuts

CTRL+C (Copy)
CTRL+X (Cut)
CTRL+V (Paste)
CTRL+Z (Undo)
DELETE (Delete)
SHIFT+DELETE (Delete the selected item permanently without placing the item in the Recycle Bin)
CTRL while dragging an item (Copy the selected item)
CTRL+SHIFT while dragging an item (Create a shortcut to the selected item)
F2 key (Rename the selected item)
CTRL+RIGHT ARROW (Move the insertion point to the beginning of the next word)
CTRL+LEFT ARROW (Move the insertion point to the beginning of the previous word)
CTRL+DOWN ARROW (Move the insertion point to the beginning of the next paragraph)
CTRL+UP ARROW (Move the insertion point to the beginning of the previous paragraph)
CTRL+SHIFT with any of the arrow keys (Highlight a block of text)
SHIFT with any of the arrow keys (Select more than one item in a window or on the desktop, or select text in a document)
CTRL+A (Select all)
F3 key (Search for a file or a folder)
ALT+ENTER (View the properties for the selected item)
ALT+F4 (Close the active item, or quit the active program)
ALT+ENTER (Display the properties of the selected object)
ALT+SPACEBAR (Open the shortcut menu for the active window)
CTRL+F4 (Close the active document in programs that enable you to have multiple documents open simultaneously)
ALT+TAB (Switch between the open items)
ALT+ESC (Cycle through items in the order that they had been opened)
F6 key (Cycle through the screen elements in a window or on the desktop)
F4 key (Display the Address bar list in My Computer or Windows Explorer)
SHIFT+F10 (Display the shortcut menu for the selected item)
ALT+SPACEBAR (Display the System menu for the active window)
CTRL+ESC (Display the Start menu)
ALT+Underlined letter in a menu name (Display the corresponding menu)
Underlined letter in a command name on an open menu (Perform the corresponding command)
F10 key (Activate the menu bar in the active program)
RIGHT ARROW (Open the next menu to the right, or open a submenu)
LEFT ARROW (Open the next menu to the left, or close a submenu)
F5 key (Update the active window)
BACKSPACE (View the folder one level up in My Computer or Windows Explorer)
ESC (Cancel the current task)
SHIFT when you insert a CD-ROM into the CD-ROM drive (Prevent the CD-ROM from automatically playing)
Dialog Box Keyboard Shortcuts
CTRL+TAB (Move forward through the tabs)
CTRL+SHIFT+TAB (Move backward through the tabs)
TAB (Move forward through the options)
SHIFT+TAB (Move backward through the options)
ALT+Underlined letter (Perform the corresponding command or select the corresponding option)
ENTER (Perform the command for the active option or button)
SPACEBAR (Select or clear the check box if the active option is a check box)
Arrow keys (Select a button if the active option is a group of option buttons)
F1 key (Display Help)
F4 key (Display the items in the active list)
BACKSPACE (Open a folder one level up if a folder is selected in the Save As or Open dialog box)
m*cro$oft Natural Keyboard Shortcuts
Windows Logo (Display or hide the Start menu)
Windows Logo+BREAK (Display the System Properties dialog box)
Windows Logo+D (Display the desktop)
Windows Logo+M (Minimize all of the windows)
Windows Logo+SHIFT+M (Restore the minimized windows)
Windows Logo+E (Open My Computer)
Windows Logo+F (Search for a file or a folder)
CTRL+Windows Logo+F (Search for computers)
Windows Logo+F1 (Display Windows Help)
Windows Logo+ L (Lock the keyboard)
Windows Logo+R (Open the Run dialog box)
Windows Logo+U (Open Utility Manager)
Accessibility Keyboard Shortcuts
Right SHIFT for eight seconds (Switch FilterKeys either on or off)
Left ALT+left SHIFT+PRINT SCREEN (Switch High Contrast either on or off)
Left ALT+left SHIFT+NUM LOCK (Switch the MouseKeys either on or off)
SHIFT five times (Switch the StickyKeys either on or off)
NUM LOCK for five seconds (Switch the ToggleKeys either on or off)
Windows Logo +U (Open Utility Manager)
Windows Explorer Keyboard Shortcuts
END (Display the bottom of the active window)
HOME (Display the top of the active window)
NUM LOCK+Asterisk sign (*) (Display all of the subfolders that are under the selected folder)
NUM LOCK+Plus sign (+) (Display the contents of the selected folder)
NUM LOCK+Minus sign (-) (Collapse the selected folder)
LEFT ARROW (Collapse the current selection if it is expanded, or select the parent folder)
RIGHT ARROW (Display the current selection if it is collapsed, or select the first subfolder)
Shortcut Keys for Character Map
After you double-click a character on the grid of characters, you can move through the grid by using the keyboard shortcuts:
RIGHT ARROW (Move to the right or to the beginning of the next line)
LEFT ARROW (Move to the left or to the end of the previous line)
UP ARROW (Move up one row)
DOWN ARROW (Move down one row)
PAGE UP (Move up one screen at a time)
PAGE DOWN (Move down one screen at a time)
HOME (Move to the beginning of the line)
END (Move to the end of the line)
CTRL+HOME (Move to the first character)
CTRL+END (Move to the last character)
SPACEBAR (Switch between Enlarged and Normal mode when a character is selected)
m*cro$oft Management Console (MMC) Main Window Keyboard Shortcuts
CTRL+O (Open a saved console)
CTRL+N (Open a new console)
CTRL+S (Save the open console)
CTRL+M (Add or remove a console item)
CTRL+W (Open a new window)
F5 key (Update the content of all console windows)
ALT+SPACEBAR (Display the MMC window menu)
ALT+F4 (Close the console)
ALT+A (Display the Action menu)
ALT+V (Display the View menu)
ALT+F (Display the File menu)
ALT+O (Display the Favorites menu)
MMC Console Window Keyboard Shortcuts
CTRL+P (Print the current page or active pane)
ALT+Minus sign (-) (Display the window menu for the active console window)
SHIFT+F10 (Display the Action shortcut menu for the selected item)
F1 key (Open the Help topic, if any, for the selected item)
F5 key (Update the content of all console windows)
CTRL+F10 (Maximize the active console window)
CTRL+F5 (Restore the active console window)
ALT+ENTER (Display the Properties dialog box, if any, for the selected item)
F2 key (Rename the selected item)
CTRL+F4 (Close the active console window. When a console has only one console window, this shortcut closes the console)
Remote Desktop Connection Navigation
CTRL+ALT+END (Open the m*cro$oft Windows NT Security dialog box)
ALT+PAGE UP (Switch between programs from left to right)
ALT+PAGE DOWN (Switch between programs from right to left)
ALT+INSERT (Cycle through the programs in most recently used order)
ALT+HOME (Display the Start menu)
CTRL+ALT+BREAK (Switch the client computer between a window and a full screen)
ALT+DELETE (Display the Windows menu)
CTRL+ALT+Minus sign (-) (Place a snapshot of the active window in the client on the Terminal server clipboard and provide the same functionality as pressing PRINT SCREEN on a local computer.)
CTRL+ALT+Plus sign (+) (Place a snapshot of the entire client window area on the Terminal server clipboard and provide the same functionality as pressing ALT+PRINT SCREEN on a local computer.)
m*cro$oft Internet Explorer Navigation
CTRL+B (Open the Organize Favorites dialog box)
CTRL+E (Open the Search bar)
CTRL+F (Start the Find utility)
CTRL+H (Open the History bar)
CTRL+I (Open the Favorites bar)
CTRL+L (Open the Open dialog box)
CTRL+N (Start another instance of the browser with the same Web address)
CTRL+O (Open the Open dialog box, the same as CTRL+L)
CTRL+P (Open the Print dialog box)
CTRL+R (Update the current Web page)
CTRL+W (Close the current window)