CyberHunter
Local dataset, no network
// Other services

Port 3137: rtnt-1 data packets

Port 3137 is assigned by IANA to rtnt-1 (rtnt-1 data packets).

3137

How rtnt-1 works

Other services
client:3137rtnt-1response client:3137rtnt-1response

The client sends a request to port 3137 and the rtnt-1 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 3137 dangerous?

We have no specific security note for port 3137. 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 3137

ServicePortTransportDescriptionReferenceUpdated
rtnt-1 3137 TCP, UDP rtnt-1 data packets - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3137, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3137'      # process listening on 3137
sudo lsof -nP -i :3137

macOS

sudo lsof -nP -i :3137

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3137 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3137
netstat -ano | findstr :3137

From another machine

nmap -p 3137 -sV <host>
sudo nmap -sU -p 3137 <host>
nc -zv <host> 3137

Block it in the firewall

sudo ufw deny 3137/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3137" -Direction Inbound -LocalPort 3137 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3137 used for?

Port 3137 is assigned by IANA to rtnt-1 (rtnt-1 data packets).

Is port 3137 TCP or UDP?

Port 3137 is registered for TCP and UDP.

Is it safe to open port 3137?

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 3137 is open?

On Linux run "ss -ltnup 'sport = :3137'", on macOS "lsof -nP -i :3137", and on Windows "netstat -ano | findstr :3137" to see the local process. From another machine, "nmap -p 3137 <host>" shows whether it is reachable.

05 Related
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