Port 2126PacketCable COPS

PacketCable policy-control traffic using the Common Open Policy Service protocol.

transport: tcp · udp
in transit: cleartext
assignment: official
risk: 2/10
lookups: 0

also known as pktcable-cops

Technical Details

what runs on :2126

PacketCable COPS is based on the Common Open Policy Service protocol, a client/server policy-control protocol that normally uses a persistent TCP connection and binary, length-delimited messages. IANA assigns both TCP and UDP port 2126 for this PacketCable-specific service; the general COPS service is associated with a different port, so traffic on 2126 should be identified as the PacketCable profile rather than generic COPS.

Security Information

exposure of :2126

risk score

2/ 10safe

routine exposure. this port is rarely the way in on its own — keep it patched and logged and move on.

network services averages 3.1 across 905 ports — this one sits 1.1 below.

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

This traffic is not encrypted by default and is intended for controlled provider-network links, not direct Internet exposure. An exposed endpoint could permit policy probing or disruption and may be vulnerable to malformed-message handling issues; restrict it to trusted PacketCable peers and use network-layer protection where required.

Record

iana registry entry

port: :2126
service: PacketCable COPS
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 2/10safe
category: Network Services
usage: PacketCable COPS is used by cable-telephony infrastructure to exchange policy and admission-control information between network elements and policy servers. Engineers are most likely to encounter it inside provider access networks, rather than on general-purpose hosts.
lookups: 0rank 994
added: 2026-09-02
updated: 2026-09-02
references: IANA service name registry — port 2126

Something wrong?

This record is maintained by the engineers who use port 2126. 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 2026-09-02.

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edit this record →back to the registry

Related Ports

all 905 in network services →

the 8 most looked-up other ports in network services — 905 ports carry that label.

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: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 :2126PacketCable COPS

Technical Details

Security Information

Related Ports

Port 2126PacketCable COPS