I. Addressing and Naming conventions

1.  Form of an Electronic Address on the internet:
	<userid>@<computer-hostdomainname>

2. Examples of fully qualified domain names:
	katz@scn.org
	arkay@halcyon.com
	katz@hcc-cis.ctc.edu
	p00719@psilink.com
	melissa%misty@ucsd.edu

3. Each part of a domain name describes the computer and is called a subdomain.
Subdomains are separated by periods.  The rightmost subdomain is called the top
level domain, and is the most general. It becomes more specific reading to the
left.

4. Note: the non-userid part of Electronic addresses are case-insensitive; 
but the userid is case-sensitive

5. IP addresses: the numerical equivalent of host domain names (also several 
parts separated by periods:
  198.137.231.1	coho.halcyon.com	[Northwest Nexus 
						Provider]
  198.137.188.24	scn.org		[Seattle Community
 						Network]
  198.137.188.2		spl.lib.wa.us	[Seattle Public
 						Library]
  129.79.254.191	cs.indiana.edu 2627	[Dictionary Server,
 							port]
  38.8.1.2		psilink.com		[psi provider]

6. DNS (Domain Name System) translates between Domain names and IP addresses.  
In UNIX, the command: 
$ host <address> 	or
$ nslookup <address> 
can be used with one form of address to get the other form.

7. Other network addressing systems (pseudo-domains)
* UUCP addresses: Specifies the computer name route the 	
message shall take: e.g.  
	alpha $ mail beta!gamma!delta.com!murray
	(Compare with: alpha $ mail murray@delta.com)
* CompuServe addresses: To send mail to a CompuServe 	
user 12345,678 do   
	alpha $ mail 12345.678@compuserve.com
* MCIMail addresses: To send mail to an MCIMail user 	
12345 with user name rkatz do
	alpha $ mail 12345@mcimail.com
* FidoNet addresses: To send mail to a user on a FidoNet 	
computer 1:234/567 with user 
	Robert Katz do                  (node  net  zone)
	alpha $ mail Robert.Katz@f567.n234.z1.fidonet.org
* Bitnet addresses: To send mail to a Bitnet computer user arkay at 
alpha $ mail arkay@psuvm.bitnet  or	(Gateway)
alpha $ mail arkay%psuvm.bitnet@cornellc.cit.cornell.edu

8. Types of domains: Organizational (within the U.S.) and Geographical

Domain	Meaning
com		commercial organization
edu		educational institution
gov		(U.S.) government
int		international organization
mil		military
net		networking organization
org		non-profit organization

at		Austria
au		Australia
ca		Canada
ch		Switzerland (Cantons of Helvetia)
de		Germany (Deutschland)
dk		Denmark
es		Spain (Espana)
fr		France
gr		Greece
ie		Ireland
jp		Japan
nz		New Zealand
uk		United Kingdom
us		United States

Questions? Robert Katz: katz@ned.highline.edu
Last Update August 8, 1998