Archived Basic Domain Name Information

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NOTE: The content provided on this page is archived from 1998.
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What is a Domain Name?
In simple terms, a domain name is a human-language equivalent of an address on the Internet. The name actually translates to a number, or more correctly a series of numbers, roughly comparable to a telephone number. Like a telephone number, an Internet address is unique, that is to say, no two are the same. And like a telephone number, it serves to connect "callers" to one specific place on the Net.
There are advantages to using names instead of just the numbers alone. The most obvious is that people can more easily recognize and remember a meaningful word than a long string of numerals.

Another, major advantage is that a domain can be moved to a new machine, where it will have a new number, but the name will remain the same. The DNS (Domain Name System) records are simply altered to reflect the change, and access to the domain continues unchanged.

An Internet domain may be the "home" for any number of things: web sites, mailboxes, files for downloading, even entire computer networks. You see domain names as part of practically every Internet address. In the e-mail address info@domains.org (a mailbox), the domain name is domains.org. In the Web address http://www.lycos.com (a web page), the domain name is lycos.com.

Occasionally, you will see the numeric address instead of the domain name. http://206.184.226.167/basics.html is a perfectly serviceable address for this web page you're reading.

That number is called an IP Address, meaning Internet Protocol address. Internet Protocol is a standard for network communications, which is used throughout Net.

It is sometimes useful to match up a domain name with its IP Address, or vice-versa. This is commonly done with a utility called "nslookup". There are many nslookup "gateways" scattered around the Web. The list below points to some of them.

Now we'll examine the name itself. Domain names have at least two parts, separated by a dot or period.

The part after the dot is called the Top Level Domain (TLD). The Top Level Domain serves to broadly categorize the name as to its type or purpose. Common TLDs include .com (commercial), .org (organization), .edu (educational institutions), .net (networks), .gov (U.S. government)and .mil (U.S. military).

There are also hundreds of country TLDs, such as .us (USA), .fr (France), .de (Germany), etc. These are in more general use outside the US.

Additional "generic" TLDs (gTLDs) have been proposed and will probably come into general use by sometime in 1988. Domain names ending in .firm, .store, .web, .arts, .rec, .info, .nom and possibly many others will become widespread on the Net.

Addresses ending in .com are by far the most common at present; they're generally intended to be commercial in nature, although at present the .com TLD actually serves as a catch-all for virtually all domain names that don't fit the other, more specific TLDs.

The part of the domain name before the dot is the Second Level Domain (SLD). If you're registering a name, you have considerable freedom of choice in what this will be. So long as the name you choose does not already exist under the same TLD, and is not obviously a famous trademark owned by someone else, its registration is generally allowed. An SLD can contain up to 24 characters: letters, numbers and dashes are allowed.

Databases of domain records are maintained by InterNIC, the primary name registry on the Internet in the US, and by a variety of similar agencies throughout the world. Accessed through a utility program called WHOIS, these databases are easily accessed from throughout the Net. There's a list below of sites that provide a WHOIS "gateway" for queries of domain name databases from your Web browser.

(Incidentally, you may do well to remember that your own domain registration will become a publicly-available WHOIS record. For instance, perhaps you have a phone number or e-mail address you'd rather not share with literally the entire world...)

WHOIS Gateways
The following gateways vary, but generally, simply entering a domain name on the query form will yield a record for that name. Entering company names, individual names, e-mail addresses and other queries may also yield information. WHOIS provides a good way to investigate prospective names to determine which are already registered, and to find what companies or persons are associated with a domain name.

Web-based WHOIS Gateways

Various gateways at North American commercial and academic sites:

InterNIC Web Interface to Whois:
http://www.rs.internic.net/cgi-bin/whois
or http://rs.internic.net/cgi-bin/whois
Sparknet:
http://www.sparknet.net/cgi-bin/whois
Martinet Development Corp.:
http://www.martinet.com/~tadman/
whois/whois.cgi
or http://www.martinet.com/~tadman/whois/
Sentex:
http://www.sentex.net/cgi-bin/whois
Heller Information Services:
http://www.his.com/cgi-bin/whois
Internet Images Worldwide:
http://www.inet-images.com/whois.html
Internet Texoma:
http://home.texoma.net/cgi-bin/whois
UnaBEST's Gateway - Combined WHOIS, nslookup, finger and traceroute:
http://www.magibox.net/~unabest/whois/
College of Saint Benedict & Saint John's University:
http://www.csbsju.edu/cgi-bin/whois
or http://www.physics.csbsju.edu/cgi-bin/whois
University of Michigan:
http://mendel.hgp.med.umich.edu/cgi-bin/whois
Indiana University:
http://iuaccounts.ucs.indiana.edu/open-bin/whois
or http://whois.indiana.edu/open-bin/whois
US Air Force Air Education and Training Command, Randolph Air Force Base, Texas:
http://www.aetc.af.mil/AETC-NetMgmt/whois.html
CAIS (multi-purpose gateway):
http://networking.cais.net/gateways.html
Hiway Technologies (check for name availability only):
http://www.hway.net/whois.html

European and other international WHOIS gateways

EUnet GB (CO.UK domains):
http://www.britain.eu.net/naming-co/whois-form.html
University of Regensburg, Germany:
http://rchs1.uni-regensburg.de/cgi-bin/whois
Darmstadt Technical School, Germany:
http://www.th-darmstadt.de/cgi-bin/whois
Sven's W3 WHOIS Gateway (German)
http://mbpc07.cl.ba-karlsruhe.de/whois.html
Academic and Research Network of Slovenia:
http://www.arnes.si/cgi-bin/whois
SWITCH - Swiss Academic and Research Network:
http://www.switch.ch/switch
/info/whois_form.html
or http://www.tlab.ch/praktika/
c04/whois_form.html
RESTENA (RESTENA manages the top-level domain .lu for Luxembourg):
http://www.domain-registration.lu/whois.html
National Computerization Agency, Korea:
http://202.30.64.22/cgi-bin/whois
KRNIC (Korean Network Information Center):
http://www.krnic.net/cgi-bin/whois_kr
or http://www.krnic.net/cgi-bin/whois

WHOIS via Telnet

WHOIS Gateway via nic.switch.ch (Switzerland):
telnet://130.59.1.40/
WHOIS Gateway via info.ripe.net (also Gopher, WAIS, WWW)
telnet://193.0.0.195/
WHOIS Gateway via Internic
telnet://198.41.0.5/

More Info

WHOIS servers list:
ftp://sipb.mit.edu/pub/whois/whois-servers.list

Nslookup Gateway
Just a few of many...

North America

Hood College, Maryland:
http://www.hood.edu/cgi-bin/nslookup.sh.cgi
Eastern New Mexico University:
http://www.enmu.edu/~moorej/cgi-bin/nslookup.gate
UCLA:
http://morganism.unex.ucla.edu/nslookup.htm
Sparknet:
http://www.sparknet.net/cgi-bin/nslookup
KCOnline, Kosciusko County, Indiana:
http://www2.kconline.com/cgi-bin/nslookup
Sittcom:
http://www.sitt.com/cgi-bin/nslookup
Troubador Systems:
http://troubador.com/cgi-bin/nslook
UnaBEST's Gateway - Combined WHOIS, nslookup, finger and traceroute:
http://www.magibox.net/~unabest/nslookup/
or http://www.magibox.net/~unabest/whois/
Multiple gateways, courtesy Patrick McConnell:
http://www.interlog.com/~patrick
/personal/online/gateways.html
On the personal page of
marcus@ocala.cs.miami.edu:
http://ocala.cs.miami.edu/~jmcla/cgi-bin
/lookup.cgi

Europe, etc.

Koninklijke Bibliotheek (National Library of the Netherlands):
http://www.konbib.nl/cgi-bin
/nslookupgateway.sh
University of Antwerp:
http://www.uia.ac.be/ds/nslookup.html
Electromagnetic Wave Laboratory, Nagasaki University, Japan:
http://ebisu.ec.nagasaki-u.ac.jp/cgi/nslookup.cgi
Vit Internet Service, Japan:
http://www.vit.or.jp/~minamino
/nslookup.htm

ที่มา
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