converting ip numbers to domain names in log files

[J.D. Carlson]

I'd like to know if there is a program I can filter a log file through
that will resolve the ip numbers into the respective names.  Running
bind 8.2.2-P5 on OpenBSD 2.6, with no problems.  When I turn on query
logging on I would like to go back and see where some of the domains
are.  I'm well acquainted with 'host', 'dig', and 'nslookup'. I'd like
to be able to 'grep <some expression> logfile | <addr2name prog> and see
the results with IP numbers replaced by names.

Thanks for any suggestions.

J.D. Carlson