Port 12002IBM Enterprise Extender SNA COS High Priority

IBM Enterprise Extender traffic for high-priority SNA Class of Service flows.

transport: tcp · udp
in transit: cleartext
assignment: official
risk: 6/10
lookups: 0

also known as entexthigh

Technical Details

what runs on :12002

Enterprise Extender encapsulates SNA traffic for transport across IP, normally using UDP and assigning different service ports to SNA Class of Service priorities. Port 12002 is the registered high-priority COS port; the IANA registration lists both TCP and UDP, although deployed Enterprise Extender traffic is ordinarily UDP-based. It is part of the related IBM Enterprise Extender port range and is not a general-purpose web or application protocol.

Security Information

exposure of :12002

risk score

6/ 10risk

treat as sensitive. widely scanned and regularly exploited when reachable — restrict it to known sources.

network services averages 2.6 across 1,559 ports — this one sits 3.4 above.

in transit

cleartext

credentials and payloads are readable by anyone on path

assignment

official

registered with iana for this service — scanners fingerprint it by number

reachable over

tcp · udp

udp is connectionless — source addresses are trivially spoofed and it is a reflection favourite

security overview

Enterprise Extender traffic is not encrypted by default, so this port should normally be restricted to trusted enterprise networks or protected with network-layer security such as IPsec or a private WAN. Internet exposure can disclose legacy SNA application traffic and permits spoofing or denial-of-service attempts against reachable SNA infrastructure; it should not ordinarily be exposed to the public Internet.

Record

iana registry entry

port: :12002
service: IBM Enterprise Extender SNA COS High Priority
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 6/10risk
category: Network Services System
usage: This port is used by IBM Enterprise Extender to transport Systems Network Architecture traffic between SNA nodes across an IP network. It is typically encountered on IBM mainframe, host-integration, and networking systems rather than on general-purpose Internet servers.
lookups: 0rank 993
added: 2026-08-25
updated: 2026-09-22
references: IANA service name registry — port 12002

Something wrong?

This record is maintained by the engineers who use port 12002. Every field on it is editable — change what's wrong, say how you know, and a reviewer publishes it, usually within a minute. Last touched 2026-09-22.

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edit this record →back to the registry

Related Ports

all 1,559 in network services →

the 8 most looked-up other ports in network services — 1,559 ports carry that label.

port	service	proto	category	risk	views
:9080	Groove RPC	TCPUDP	Web Services	caution	70.8k
:6543	Jetnet	UDP	Network Services	caution	65.3k
:5938	TeamViewer	TCPUDP	Remote Access	caution	65.0k
:8291	Winbox MikroTik Admin	TCP	Security	caution	62.9k
:3233	WhiskerControl Protocol	TCPUDP	Network Services	caution	61.9k
:3268	Microsoft Global Catalog (GC)	TCPUDP	Security	caution	54.6k
:135	Microsoft EPMAP	TCPUDP	Security	caution	51.9k
:3128	Tatsoft Default HTTP Proxy	TCP	Web Services	caution	46.8k

risk mix of the 8 listed

caution100%

0 of 8 encrypted

Port :12002IBM Enterprise Extender SNA COS High Priority

Technical Details

Security Information

Related Ports

Port 12002IBM Enterprise Extender SNA COS High Priority