NetBIOS over TCP/IP

NetBIOS-over-TCP
Communication protocol
IntroductionMarch 1983 (1983-03)
OSI layerLayer 7, Application layer
Port(s)137/udp, 137/tcp, 138/udp, 139/tcp
RFC(s)1001, 1002

NetBIOS over TCP/IP (NBT, or sometimes NetBT) is a networking protocol that allows legacy computer applications relying on the NetBIOS API to be used on modern TCP/IP networks.

NetBIOS was developed in the early 1980s, targeting very small networks (about a dozen computers). Some applications still use NetBIOS, and do not scale well in today's networks of hundreds of computers when NetBIOS is run over the NetBIOS Frames protocol. When properly configured, NetBIOS over TCP/IP allows those applications to be run on large TCP/IP networks (including the whole Internet, although that is likely to be subject to security problems) without change.

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