[dns-operations] A very good list of open public DNS resolvers

[Stephane Bortzmeyer]

On Tue, Dec 08, 2009 at 11:10:56PM +0000,
 Tony Finch <dot at dotat.at> wrote 
 a message of 19 lines which said:

> For instance, it lists the IPv6 addresses of Cambridge's resolvers,
> but not the corresponding IPv4 addresses, and in any case only about
> 40,000 people are permitted to use them.

It is compiled by hand so, there are probably a few mistakes and,
anyway, filtering may change on a daily basis (or the tester was
simply on the campus at the time of the test and forgot that point...)

Most open resolvers (for instance the famous Level-3 ones) do not have
an explicit policy about being open and so can close at any time.