Quoting "Phil (Medway Hosting)" phil@medwayhosting.com:

Question for admins

Is it ok if I run a list of 45k IP's I am researching, against SURBL list please ? I didn't want to do it without permission in case you suddenly thought I have become a MUCH larger company !!

Many thanks

Phil

Anything up to 100k to 250k per day is ok to query against the public nameservers. However it's probably more efficient to rsync the zone files and compare the data locally.

Some notes:

1. There aren't many IP addresses on the SURBL blacklists. 2. Most of them are cracked phishing sites or botnet web hosts. 3. The detection of botnet web host IPs may be Zipfian: a few IPs are seen very frequently and many IPs are seen infrequently, perhaps even as infrequently as just once. If so, then blacklisting them (at least the infrequently seen ones) may not be too useful.

Cheers,

Jeff C.