Port 9339gNMI/gNOI

gNMI/gNOI gRPC endpoint for network-device configuration, telemetry, and operational actions.

transport: tcp
in transit: encrypted
assignment: official
risk: 8/10
lookups: 0

Technical Details

what runs on :9339

This is a TCP endpoint for gNMI and gNOI, RPC interfaces defined using Protocol Buffers and carried by gRPC over HTTP/2. gNMI provides Get, Set, and streaming Subscribe operations for device state and configuration; gNOI provides operational RPCs for tasks such as system, file, OS, and certificate operations. With TLS, gRPC negotiates HTTP/2 (commonly using ALPN h2); the RPCs use protobuf messages framed within gRPC streams. TLS and authentication are common in production, but the port number alone does not guarantee either. Port 9339 is the registry assignment; gNMI is also commonly deployed on other ports, including 57400.

Security Information

exposure of :9339

risk score

8/ 10risk

treat as sensitive. widely scanned and regularly exploited when reachable — restrict it to known sources.

network services averages 2.6 across 1,848 ports — this one sits 5.4 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

An exposed endpoint can provide access to sensitive network telemetry and, depending on enabled RPCs and authorization, allow configuration changes or other device operations. Restrict it to a trusted management network or VPN, require TLS and strong authentication, and apply least-privilege authorization; do not assume that use of this port ensures encryption or access control.

Record

iana registry entry

port: :9339
service: gNMI/gNOI
transport: TCP
encryption: tls / encrypted
assignment: iana registered
risk: 8/10risk
category: Network Services
usage: Network-device management clients use gNMI to read or change configuration and stream telemetry, and gNOI to perform operational tasks such as software or certificate management. The endpoint is typically on a router, switch, or network operating system; port 9339 is registered for these interfaces, though deployments may use other ports.
lookups: 0rank 993
added: 2026-10-15
updated: 2026-10-15
references: IANA service name registry — port 9339

Something wrong?

This record is maintained by the engineers who use port 9339. 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 2026-10-15.

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02a model checks it for accuracy and spam
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edit this record →back to the registry

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risk mix of the 8 listed

caution100%

0 of 8 encrypted

Port :9339gNMI/gNOI

Technical Details

Security Information

Related Ports

Port 9339gNMI/gNOI