Internet Protocol Addressing
Discussion of IP classes, subnetting, whois, private networks, Name Resolution (hosts file, DNS, nslookup, etc)
Checked: may-02
Whois
IP Index  
(who owns what IP range divided by Class A, B, C) Was very useful
but is currently under restructuring (since Feb-02)
Fast Guide to DSL
  including 8 paragraphs on what it is and then a comparison of
the different types of DSL: ADSL, CDSL, DSL-lite, IDSL, RADL, SDSL,
UDSL, VDSL, x2/DSL.
Checked: nov-06
ADSLguide.org.uk
  including FAQs, tech description, and comparisons of facilities and rates of
DSL service providers
Checked: nov-06
LivingInternet's Comprehensive Guide to the Internet  
easily digestable info on Internet history, Email, WWW, Usenet,
IRC, MUDs. e.g. the Internet section contains good intros to technical
stuff like IP addressing, packet switching, Routing Protocol
comparison, DNS, Ethernet, ...
Checked: may-02
Introduction to the Internet Protocols
  (1987)  
Tutorials of a couple of pages each on :
  What is TCPIP,
    TCP, IP and ethernet levels
    Well known ports,
  UDP, ICMP,
  DNS,
  Routing,
  Subnets & broadcasting,
  fragmentation, ethernet encapsulation, ARP,
  Discussion of IP classes, subnetting, whois, private networks,
  Name Resolution (hosts file, DNS, nslookup, etc)
Checked: may-02-00