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// Other services

Port 2951: OTTP

Port 2951 is assigned by IANA to ottp (OTTP).

2951

How ottp works

Other services
client:2951ottpresponse client:2951ottpresponse

The client sends a request to port 2951 and the ottp 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 2951 dangerous?

We have no specific security note for port 2951. 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 2951

ServicePortTransportDescriptionReferenceUpdated
ottp 2951 TCP, UDP OTTP - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2951, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2951'      # process listening on 2951
sudo lsof -nP -i :2951

macOS

sudo lsof -nP -i :2951

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2951 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2951
netstat -ano | findstr :2951

From another machine

nmap -p 2951 -sV <host>
sudo nmap -sU -p 2951 <host>
nc -zv <host> 2951

Block it in the firewall

sudo ufw deny 2951/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2951" -Direction Inbound -LocalPort 2951 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2951 used for?

Port 2951 is assigned by IANA to ottp (OTTP).

Is port 2951 TCP or UDP?

Port 2951 is registered for TCP and UDP.

Is it safe to open port 2951?

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 2951 is open?

On Linux run "ss -ltnup 'sport = :2951'", on macOS "lsof -nP -i :2951", and on Windows "netstat -ano | findstr :2951" to see the local process. From another machine, "nmap -p 2951 <host>" shows whether it is reachable.

05 Related
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