Free service automatically determines one's address on the Internet.

IP Performance Metrics (IPPM) Working Group at IETF.

Request For Comments 791 documents the fundamental workings of IP.

Forum to accelerate adoption of the IP Multicast Initiative through education and marketing.

Offers information and news on the evolving technologies of internet protocol television including hardware, software, and services.

Free utility detects one's current IP address from behind a router.

This 18-question online quiz tests your knowledge of the nuts and bolts of Internet Protocol.

Collection of broken, malformed, or peculiar packets found on the Internet, with theories as to how they came to be.

ACM Crossroads magazine article explains network protocol concepts, IP packets, and IP addressing.

Section 3 of "Connected: An Internet Encyclopedia" discusses datagrams and streams, subnetting, and the delivery model.