The dns/dnscheck port has not been updated in over a decade and is no longer supported by the author and port maintainer (err, me..). Many online tools exist today with similar, if not the same functionality. Thanks.
A commit references this bug: Author: meta Date: Tue Nov 27 05:21:24 UTC 2018 New revision: 485983 URL: https://svnweb.freebsd.org/changeset/ports/485983 Log: dns/dnscheck: Remove port Unmaintained upstream over a decade. PR: 233529 Submitted by: jarrod@downtools.com.au (maintainer, upstream author) Approved by: mentors (implicit) Changes: head/MOVED head/dns/Makefile head/dns/dnscheck/
Committed, thanks for your contribution up to today!
Note that its customary (and a better user experience) to deprecate a port for some period before deleting it, to allow users time to find alternatives.
(In reply to Kubilay Kocak from comment #3) I see, thanks for the info.