mailgun.org has no AAAA records.
Apex domains cannot have CNAME records.
Google
Domain verification
google-site-verification=FIGVOKZm6lQFDBJaiC2DdwvBy8TInunoGCt-1gnL4PA
Yahoo
Domain verification
yahoo-verification-key=6SqcA173NI/sqCJxeUdqWBdMhCYOvO3l8KcWWDpf0qY=
8f7088gv5932jxw9lwwd1b6ttx2pw2ds
_8nu1z7buo055obs89jw55hkjzooc4nm
bm875fk62qjqg22ls9c0hzvp69fg6v45
ns-133.awsdns-16.com
Amazon Web Services
Route 53
ns-1482.awsdns-57.org
Amazon Web Services
Route 53
ns-1614.awsdns-09.co.uk
Amazon Web Services
Route 53
ns-586.awsdns-09.net
Amazon Web Services
Route 53
Zone apex
Start of authority
Email
Serial
1
Refresh
2h
Retry
15m
Expire
14d
Negative cache TTL
1d