knownports / Ports 100–199 / Port 139

Port139

  • netbios-ssnNETBIOS Session Service

IANA has registered port 139 to netbios-ssn on TCP and UDP.

  1. 136profile
  2. 137netbios-ns
  3. 138netbios-dgm
  4. 139netbios-ssn
  5. 140emfis-data
  6. 141emfis-cntl
  7. 142bl-idm
TCP assignedUDP assignedreservedno entryAll 98 assigned numbers in ports 100–199

Registry entries

ServiceProtocolsRegisteredModifiedRFCsOther specs
netbios-ssnTCPUDP————

Where it sits in the registry

Port 139 is one of 98 numbers with an assignment in ports 100–199 (98.0% of the range). 95 other numbers in the range are assigned on exactly the same transports, TCP and UDP, the usual pattern for older entries. The registry records no registration date for it, as for 97 other numbers in the range; dates were recorded mainly from 2002 on.

Status on each protocol

ProtocolOn port 139Other numbers with the same statusNearest with the same status
TCPassigned to netbios-ssn5,887138 netbios-dgm
UDPassigned to netbios-ssn5,500138 netbios-dgm
SCTPno entry5,999138 netbios-dgm
DCCPno entry6,080138 netbios-dgm

5,273 other assigned numbers in the registry have exactly this combination across all four protocols.

The nearest assigned numbers

PortServiceLabelProtocolsRegisteredDistance
136profilePROFILE Naming SystemTCPUDP—3
137netbios-nsNETBIOS Name ServiceTCPUDP—2
138netbios-dgmNETBIOS Datagram ServiceTCPUDP—1
140emfis-dataEMFIS Data ServiceTCPUDP—1
141emfis-cntlEMFIS Control ServiceTCPUDP—2
142bl-idmBritton-Lee IDMTCPUDP—3