Ask the ASN 112 folks how many queries their servers handle.
http://www.as112.net/
I have a few stats for ISC's AS112 node:
- It gets about 2300 DNS UDP queries/sec + about 1300/sec SOA (due to dynamic DNS updates) + about 1000/sec PTR
- It also gets about 1200 DNS TCP connections/sec, which appear to be mostly TKEY queries.
- Today the busiest source IP address is sending 50 PTR queries/sec. Number two is 30/sec.
Duane W.