Port 5161SNMP over SSH

TCP 5161 carries SNMP management messages through an encrypted SSH connection.

transport: tcp
in transit: encrypted
assignment: official
risk: 4/10
lookups: 0

also known as snmpssh, SNMP over SSH Transport Model, RFC 5592

Technical Details

what runs on :5161

The manager connects over TCP to port 5161 and establishes an SSH connection, then carries SNMP messages over an SSH channel using the SNMP subsystem. Messages use BER encoding with a four-octet length prefix for framing. SSH provides the negotiated encryption and integrity protection, while SSH user authentication and the SNMP security model provide identity and access control. This is distinct from ordinary SSH shell access on TCP 22 and from the commonly deployed SNMP-over-UDP service on port 161.

Security Information

exposure of :5161

risk score

4/ 10caution

worth attention. how exposed you are depends on configuration — don't leave it reachable from the internet without a reason.

security averages 3.1 across 385 ports — this one sits 0.9 above.

in transit

encrypted

payloads are protected on the wire

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

Traffic is encrypted and integrity-protected by SSH, but an exposed listener is still a remote SNMP management interface. Restrict it to trusted management networks, use strong SSH authentication, and limit SNMP permissions; attackers may probe for weak credentials or flaws in the SSH and SNMP implementations. It is uncommon in internet-wide scans, but should not be treated as harmless if present.

Record

iana registry entry

port: :5161
service: SNMP over SSH
transport: TCP
encryption: tls / encrypted
assignment: iana registered
risk: 4/10caution
category: Security Network Services
usage: This port is defined for the SNMP over SSH Transport Model (RFC 5592), allowing an SNMP manager to communicate with an agent over SSH. It is a specialized, uncommon alternative to the usual SNMP transports, especially UDP port 161; finding it open may indicate an explicitly configured management service.
lookups: 0rank 993
added: 2026-10-07
updated: 2026-10-07
references: IANA service name registry — port 5161
RFC 5592

Something wrong?

This record is maintained by the engineers who use port 5161. 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 2026-10-07.

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 385 in security →

the 8 most looked-up other ports in security — 385 ports carry that label.

port	service	proto	category	risk	views
:8881	Atlasz Secure Server	TCP	Web Services	caution	67.6k
:443	HTTPS	TCPtls	Web Services	caution	65.9k
:8291	Winbox MikroTik Admin	TCP	Security	caution	62.9k
:3268	Microsoft Global Catalog (GC)	TCPUDP	Security	caution	54.6k
:135	Microsoft EPMAP	TCPUDP	Security	caution	51.9k
:3128	Squid Proxy HTTP	TCP	Web Services	caution	45.8k
:8080	HTTP Alternate	TCP	Web Services	caution	44.9k
:7000	Vuze HTTPS Tracker	TCPtls	Security	caution	28.9k

risk mix of the 8 listed

caution100%

2 of 8 encrypted

Port :5161SNMP over SSH

Technical Details

Security Information

Related Ports

Port 5161SNMP over SSH