Port 138

Modified by:

Port 138 is used for the NetBIOS datagram service, which is responsible for sending and receiving broadcast messages used for name resolution in a network. It is an older protocol, and is typically used in older Microsoft Windows environments. Today, it is mostly replaced by newer protocols such as DNS and WINS.

Ports those registered with IANA are shown as official ports. The same port number may be unofficialy used by various services or applications. The official usage are listed separately below its usage may change from time to time.

Official

Port
Protocol (TCP/UDP)
Title
Description
Port Type
Port 138
tcp
netbios-dgm
NETBIOS Datagram Service
WELL KNOWN PORT
Port 138
udp
netbios-dgm
NETBIOS Datagram Service
WELL KNOWN PORT

UnOfficial

Unofficialy or sometimes with conflict, the same port may be used by different applications.

Port Protocol (TCP/UDP) Description
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