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I'm always forgetting this information. Here's a handy reference for example domain names, example IPv4 addresses and example IPv6 addresses.

Example Domain names

From RFC 2606:

.test

For testing DNS related code

example

example.com

example.net

example.org

For documentation or as examples

IPv4 Addresses

From RFC 3330:

192.0.2.0/24 is used for documentation and example code.

198.18.0.0/15 is used for benchmark tests of network interconnect devices. See RFC 2544

IPv6 Addresses

From RFC 3849:

2001:DB8::/32 is used for documentation and examples.