We perform regular scans of >200M domains for CAA support and show their CAA adoption above. The peak in "TUM-DETAIL with CAA or CNAME2CAA" in early November stems from a hoster enabling CAA on its base domain, to which about 15k customer domains point.
These figures show the use of CAA tags by base domains.
# of domains that return inconsistent CAA configurations across their authoritative name servers. The peak in October is discussed in our paper.
caa [AT] list.net.in.tum.de