Port 3288COPS (Common Open Policy Service)

COPS carries policy requests and decisions between network devices and policy servers, typically over TCP.

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

also known as Common Open Policy Service

Technical Details

what runs on :3288

COPS uses TCP port 3288 for a persistent connection, normally initiated by the PEP to the PDP. Messages have a fixed header containing version, opcode, client type, and total length, followed by typed objects carrying policy information; request, decision, and report messages support the exchange. Although IANA lists both TCP and UDP for this assignment, the standard COPS protocol uses TCP. Related extensions include COPS-PR for policy provisioning.

Security Information

exposure of :3288

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 2.7 across 1,380 ports — this one sits 0.7 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

COPS can convey and apply network policy, so an exposed PDP or PEP may reveal sensitive configuration or create control-plane risk. The protocol does not encrypt traffic by default and depends on deployment-level protections such as IPsec and network isolation; do not expose it directly to the internet. Public scan data has not commonly observed this port open.

Record

iana registry entry

port: :3288
service: COPS (Common Open Policy Service)
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 2/10safe
category: Network Services
usage: COPS is a policy-control protocol connecting a policy enforcement point (PEP), such as a network device, to a policy decision point (PDP). It is mainly encountered in managed network environments; it is not commonly exposed on the public internet.
lookups: 0rank 993
added: 2026-09-28
updated: 2026-09-28
references: IANA service name registry — port 3288

Something wrong?

This record is maintained by the engineers who use port 3288. 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 2026-09-28.

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edit this record →back to the registry

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all 1,380 in network services →

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risk mix of the 8 listed

caution100%

0 of 8 encrypted

Port :3288COPS (Common Open Policy Service)

Technical Details

Security Information

Related Ports

Port 3288COPS (Common Open Policy Service)