#TrackingTheTrackers I'm digging into tools these days, #faup provides lookups if a string is a known domain name, and #ipgrep returns all strings that resolve to an IP address. The #ipgrep approach seems much more useful since it doesn't need a pre-prepared list of "known domain names", instead #DNS provides that

https://github.com/stricaud/faup
https://github.com/jedisct1/ipgrep