CyberHunter
LinkedIn profile - Bastien Cordier Email: contact@bastiencordier.pro
// Other services

Port 6951: OTLP

Port 6951 is assigned by IANA to otlp (OTLP).

6951

How otlp works

Other services
client:6951otlpresponse client:6951otlpresponse

The client sends a request to port 6951 and the otlp service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 6951 dangerous?

We have no specific security note for port 6951. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 6951

ServicePortTransportDescriptionReferenceUpdated
otlp 6951 TCP, UDP OTLP - 2006-04

// source: IANA service name and port number registry

03 Check it

Which program uses port 6951, and is it reachable?

Linux

sudo ss -ltnup 'sport = :6951'      # process listening on 6951
sudo lsof -nP -i :6951

macOS

sudo lsof -nP -i :6951

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 6951 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 6951
netstat -ano | findstr :6951

From another machine

nmap -p 6951 -sV <host>
sudo nmap -sU -p 6951 <host>
nc -zv <host> 6951

Block it in the firewall

sudo ufw deny 6951/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 6951" -Direction Inbound -LocalPort 6951 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 6951 used for?

Port 6951 is assigned by IANA to otlp (OTLP).

Is port 6951 TCP or UDP?

Port 6951 is registered for TCP and UDP.

Is it safe to open port 6951?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 6951 is open?

On Linux run "ss -ltnup 'sport = :6951'", on macOS "lsof -nP -i :6951", and on Windows "netstat -ano | findstr :6951" to see the local process. From another machine, "nmap -p 6951 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

Latest vulnerability news

All news