Parsing Weblogs for ISP info

[FinnMan]

I'm looking for a quick way to parse access logs and identify originating ISP based on the IP address. I can script something up that does a whois query but these logs are rather large and that seems a little 'dirty'.

Anybody by any chance know a more efficient way?

Thx!

 

[lgarner]

You can turn on domainlookups in the configuration, but that will impact performance and won't always tell you the ISP.