zcat /a/squid/archive/mobile/mobile-sampled-100.tsv.log-20130421.gz | awk '{ print $5 }' | sort | uniq -c | sort -nr | head
7706 208.80.154.x
7523 208.80.154.x
7467 208.80.154.x
7133 208.80.154.x
I'm running a job to learn more about the sessions with the most pageviews so hopefully the mystery will be solved soon, but afaik the isPageview filter excludes hits that match our CIDR ranges (and it has tests). I'll certainly double-check it, as it's used everywhere. (Also, this dataset comes from the mobile varnishes, not the squids, fwiw.)