DNS requests for 1918 space

Tue Mar 16 18:30:19 UTC 2004

> The IN-ADDR.ARPA delegations for RFC1918 space are just like any
> other block. You'll just end up hitting IANA's blackhole servers,
> and not all that much, the cache times are one week.

In theory, yes.

In reality there are quite a few resolvers that, apparently, do not
receive the delegation response and continue to hit the roots with
PTR queries for RFC1918 space.

Recent measurements at a single instance of an anycasted root server
show that at least 250 such resolvers generate between 60-120 RFC1918
PTR queries/sec.

Duane W.