Port 9875Session Announcement Protocol v1

Distributes multicast session announcements, commonly carrying SDP descriptions for streaming media.

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

also known as sapv1, SAP

1 other service is registered on port 9875. compare all 2 →

Technical Details

what runs on :9875

SAP sends periodic announcement datagrams, normally to a multicast SAP address, with no connection setup or request/response handshake. A versioned header identifies the message, source, message ID, optional authentication, encryption, or compression, followed by a payload commonly containing an SDP session description; an empty or deletion announcement can withdraw a session. The IANA assignment lists TCP and UDP port 9875, but SAP deployments generally use UDP 9875.

Security Information

exposure of :9875

risk score

2/ 10safe

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

streaming averages 3.2 across 41 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 · udp

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

security overview

SAP announcements are not encrypted by default and can be spoofed or modified by an attacker able to inject traffic into the announcement scope, potentially directing receivers to malicious or unwanted streams. It should generally remain limited to the intended multicast domain rather than be exposed to the public internet; implementations should also validate and safely parse announcement payloads.

Record

iana registry entry

port: :9875
service: Session Announcement Protocol v1
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 2/10safe
category: Streaming Media
usage: Session Announcement Protocol (SAP) distributes descriptions of multicast sessions, typically for streaming audio or video. It is normally encountered on multicast networks with SDP payloads, rather than as a public internet service; the registry assignment covers both TCP and UDP, although normal SAP traffic uses UDP.
lookups: 0rank 994
added: 2026-09-15
updated: 2026-09-15
references: IANA service name registry — port 9875
RFC 2974

Something wrong?

This record is maintained by the engineers who use port 9875. 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 2026-09-15.

01edit any field on a page of its own
02a model checks it for accuracy and spam
03clean and confident goes live immediately

edit this record →back to the registry

Related Ports

all 41 in streaming →

the 8 most looked-up other ports in streaming — 41 ports carry that label.

port	service	proto	category	risk	views
:8888	GNUmp3d Streaming HTTP	TCP	Web Services	caution	76.3k
:8000	Alternate HTTP / SHOUTcast	TCP	Web Services	caution	45.0k
:8880	Windows Media SOAP Connector	TCP	Streaming	caution	24.3k
:5001	Slingbox	TCP	Streaming	caution	22.4k
:1220	QTSS Admin	TCP	Streaming	safe	20.6k
:19294	Google Talk Voice/Video	TCP	Streaming	caution	16.6k
:12013	Audition Korea Server	TCPUDP	Streaming	caution	14.5k
:9000	SqueezeCenter	TCP	Web Services	caution	14.4k

risk mix of the 8 listed

safe13%
caution88%

0 of 8 encrypted

Port :9875Session Announcement Protocol v1

Technical Details

Security Information

Related Ports

Port 9875Session Announcement Protocol v1