Port 861One-Way Active Measurement Protocol (OWAMP) Control

Control channel for OWAMP network measurements, coordinating one-way delay and packet-loss test sessions.

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

also known as owamp-control, OWAMP, One-Way Active Measurement Protocol

Technical Details

what runs on :861

OWAMP-Control runs over TCP port 861. After establishing a control connection, the client and server negotiate security and measurement session parameters, create test sessions, start them, and later fetch or stop their results. The actual OWAMP-Test packets use UDP and are exchanged on negotiated ports; port 8760 is the commonly assigned default for OWAMP-Test. OWAMP supports unauthenticated, authenticated, and encrypted security modes, so protection depends on the selected deployment mode.

Security Information

exposure of :861

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 3.2 across 878 ports — this one sits 1.2 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

every listening transport is another surface to filter at the edge

security overview

An Internet-facing OWAMP server can be probed for implementation and measurement capabilities and may be abused to consume measurement resources or generate unwanted test traffic. Use authenticated or encrypted modes where supported, restrict control access to authorized measurement peers, and avoid exposing the service broadly unless public measurement service is intended.

Record

iana registry entry

port: :861
service: One-Way Active Measurement Protocol (OWAMP) Control
transport: TCP
encryption: cleartext
assignment: iana registered
risk: 2/10safe
category: Network Services
usage: OWAMP-Control is the TCP control channel used to authenticate, configure, start, and retrieve one-way delay and packet-loss measurement sessions. Network operators encounter it on OWAMP measurement servers, while the associated test traffic uses separately negotiated UDP sessions, commonly involving port 8760.
lookups: 0rank 994
added: 2026-08-31
updated: 2026-08-31
references: IANA service name registry — port 861
RFC 4656

Something wrong?

This record is maintained by the engineers who use port 861. 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 2026-08-31.

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risk mix of the 8 listed

caution100%

0 of 8 encrypted

Port :861One-Way Active Measurement Protocol (OWAMP) Control

Technical Details

Security Information

Related Ports

Port 861One-Way Active Measurement Protocol (OWAMP) Control