DNS over TLS
Encrypted DNS to a resolver
Security: Can bypass corporate DNS filtering if unmanaged
TCP · Encrypted: Yes
Port
Port 853
Conventionally used by DNS over TLS. Port assignments are conventions, so confirm the actual listener before you write a rule around this number.
TCPEncrypted: Yes
Protocols on this port
Where this port appears in the documentation
Exposure guidance
Decide reachability from the identity of the caller, not from the port number. If the service on this port carries credentials or administrative control, restrict it to an administrative network, require strong authentication, and log every session that reaches it.
Nearby ports
In the knowledge graph
Open the interactive map centred on this entity to see everything it connects to and travel outwards from there.