EchoDNS

A simple DNS server that returns IP addresses on demand.

Why?

For testing? Or if you ever find some very bad network access controls that rely on resolving an hostname using dns.

Examples

$ nslookup 127-0-0-1.echodns.werebug.com 192.168.1.193
Server:		192.168.1.193
Address:	192.168.1.193#53

Name:	127-0-0-1.echodns.werebug.com
Address: 127.0.0.1
Name:	127-0-0-1.echodns.werebug.com
Address: 127.0.0.1

$ nslookup 0a0a3520.echodns.werebug.com 192.168.1.193
Server:		192.168.1.193
Address:	192.168.1.193#53

Name:	0a0a3520.echodns.werebug.com
Address: 10.10.53.32
Name:	0a0a3520.echodns.werebug.com
Address: 10.10.53.32