If an address from our network appeared in a log, a firewall rule or an abuse report, this page is the answer. Nothing here is secret: we publish it so nobody has to guess, and so an automated reputation list has something accurate to read.

Write to noc@as204921.net with the address, the timestamp with its time zone, and what you saw. We answer. If a device on your own network is the one talking to our resolvers, it is doing so because something on that device chose to — the resolvers accept queries from anyone and initiate nothing.

Every prefix above carries a signed ROA for AS204921. A route to one of them from any other origin is not ours, and any validating network will drop it. That is checkable from outside — the looking glass and any public validator will tell you the same thing.