As far as I can tell AWstats can work in two modes with
It can either use a static dns cache file, but won't do
any more lookups if they are not in the file.
Or it can do the lookups as it goes along, and writes out
a dnscache file.
Can it combine the two? So make use of the cache file
of lookups it has already done, but still do real lookups
for ones it doesn't already know, and update the
cache file with these results?