Port 4317 (OpenTelemetry OTLP gRPC)

OTLP over gRPC: applications send traces, metrics and logs to the OpenTelemetry Collector.

Registered (user) port, 1024-49151 TCP Monitoring and logging Do not expose to the internet

What port 4317 is used for

OTLP over gRPC: applications send traces, metrics and logs to the OpenTelemetry Collector.

Do not expose to the internet. If exposed for browser or mobile telemetry, put auth in front; otherwise anyone can inject data.

Service nameProtoDescriptionAssigneeReference

opentelemetry TCP OpenTelemetry Protocol OpenTelemetry -

Registry dates for this port: registered 2020-12-09.

Linux: is anything listening on TCP 4317?

sudo ss -tlnp 'sport = :4317'

Linux / macOS: which process owns the port

sudo lsof -nP -i :4317

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':4317 '

Windows (Command Prompt)

netstat -ano | findstr :4317

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4317 -State Listen | Select LocalAddress,OwningProcess

From another machine

nc -vz -w 5 HOST 4317

From Windows

Test-NetConnection HOST -Port 4317

ufw

sudo ufw deny 4317/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 4317 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 4317 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 4317' -Direction Inbound -Protocol TCP -LocalPort 4317 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.