mod_geoip2 has been replaced by mod_maxminddb, and should be so in ports as well. The libmaxminddb requirement is already in ports. It seems like mod_geoip2 stopped getting updates in 2015, has been labeled as “legacy”, and support documentation was removed in early 2016. The main advantage of mod_maxminddb is IPv6 support and faster lookups. https://github.com/maxmind/mod_maxminddb https://dev.maxmind.com/geoip/legacy/mod_geoip2/ https://github.com/maxmind/geoip-api-mod_geoip2
So www/mod_geoip2 expired today and got removed.
A commit references this bug: Author: rene Date: Sat Feb 16 18:06:12 UTC 2019 New revision: 493056 URL: https://svnweb.freebsd.org/changeset/ports/493056 Log: MOVED: provide alternative for expired www/mod_geoip2 PR: 217756 Submitted by: code@daniel.priv.no Changes: head/MOVED