Port 4317OpenTelemetry Protocol (OTLP/gRPC)

Port 4317 carries OpenTelemetry telemetry data over OTLP's gRPC transport, usually to a Collector or telemetry backend.

transport: tcp
in transit: cleartext
assignment: official
risk: 5/10
lookups: 0

also known as OTLP/gRPC

Technical Details

what runs on :4317

OTLP/gRPC uses TCP with HTTP/2 framing and Protocol Buffers messages, including gRPC service calls for exporting traces, metrics, and logs. The conventional endpoint is localhost:4317; collectors and SDKs can be configured with other endpoints. TLS is supported but is not enabled by default in typical deployments, so deployments that need confidentiality or peer authentication must configure it explicitly. OTLP/HTTP is a related transport, conventionally on port 4318.

Security Information

exposure of :4317

risk score

5/ 10caution

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

network services averages 2.6 across 1,517 ports — this one sits 2.4 above.

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 exposed receiver may accept telemetry from unauthenticated clients unless authentication and network controls are configured. Untrusted submissions can pollute monitoring data or consume receiver and backend resources; telemetry can also contain sensitive operational details. Avoid direct internet exposure: restrict access to trusted networks and configure TLS and authentication where appropriate.

Record

iana registry entry

port: :4317
service: OpenTelemetry Protocol (OTLP/gRPC)
transport: TCP
encryption: cleartext
assignment: iana registered
risk: 5/10caution
category: Network Services System
usage: OpenTelemetry SDKs and agents send traces, metrics, and logs to an OpenTelemetry Collector or compatible backend on this port. It is the standard OTLP/gRPC port; OTLP over HTTP commonly uses port 4318 instead.
lookups: 0rank 993
added: 2026-10-04
updated: 2026-10-04
references: IANA service name registry — port 4317

Something wrong?

This record is maintained by the engineers who use port 4317. 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 2026-10-04.

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

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risk mix of the 8 listed

caution100%

0 of 8 encrypted

Port :4317OpenTelemetry Protocol (OTLP/gRPC)

Technical Details

Security Information

Related Ports

Port 4317OpenTelemetry Protocol (OTLP/gRPC)