Networking

Addressing IPv4

You should never see packets on the Internet coming from these networks

Addressing IPv6

IPv6 General

Regional Address registry

Routing

Multihoming

Some back-bone providers will filter your route away if you advertise less than a /19 or /20 block.

Tools

Doing whois it is sometimes difficult to find out which whois server to query. HINT: query TLD.whois-servers.net which is a cname to the correct whois server (service provided by the Geektools people).

Avoid the Problems

Books