// REFERENCE
Port 137 (NetBIOS Name)
Protocol: UDP
Service: NetBIOS-NS
High risk
NetBIOS name service (legacy Windows). It leaks host and domain names and is a target for spoofing (LLMNR/NBT-NS) to steal hashes. It must not leave the LAN.
Related tools
Work with this in:
Related
111
Port 111 (RPCbind / Portmapper) 135
Port 135 (MSRPC) 138
Port 138 (NetBIOS Datagram) 1883
Port 1883 (MQTT) 2375
Port 2375 (Docker API) 2376
Port 2376 (Docker API TLS)
Port 111 (RPCbind / Portmapper) 135
Port 135 (MSRPC) 138
Port 138 (NetBIOS Datagram) 1883
Port 1883 (MQTT) 2375
Port 2375 (Docker API) 2376
Port 2376 (Docker API TLS)
Assignments per the IANA port registry. Educational content.