16 Mar
2004
16 Mar
'04
1:30 p.m.
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.