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// Other services

Port 2737: SRP Feedback

Port 2737 is assigned by IANA to srp-feedback (SRP Feedback).

2737

How srp-feedback works

Other services
client:2737srp-feedbackresponse client:2737srp-feedbackresponse

The client sends a request to port 2737 and the srp-feedback 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 2737 dangerous?

We have no specific security note for port 2737. 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 2737

ServicePortTransportDescriptionReferenceUpdated
srp-feedback 2737 TCP, UDP SRP Feedback - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2737, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2737'      # process listening on 2737
sudo lsof -nP -i :2737

macOS

sudo lsof -nP -i :2737

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2737 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2737
netstat -ano | findstr :2737

From another machine

nmap -p 2737 -sV <host>
sudo nmap -sU -p 2737 <host>
nc -zv <host> 2737

Block it in the firewall

sudo ufw deny 2737/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2737" -Direction Inbound -LocalPort 2737 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2737 used for?

Port 2737 is assigned by IANA to srp-feedback (SRP Feedback).

Is port 2737 TCP or UDP?

Port 2737 is registered for TCP and UDP.

Is it safe to open port 2737?

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 2737 is open?

On Linux run "ss -ltnup 'sport = :2737'", on macOS "lsof -nP -i :2737", and on Windows "netstat -ano | findstr :2737" to see the local process. From another machine, "nmap -p 2737 <host>" shows whether it is reachable.

05 Related
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