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// Other services

Port 3237: appareNet Test Packet Sequencer

Port 3237 is assigned by IANA to apparenet-tps (appareNet Test Packet Sequencer).

3237

How apparenet-tps works

Other services
client:3237apparenet-tpsresponse client:3237apparenet-tpsresponse

The client sends a request to port 3237 and the apparenet-tps 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 3237 dangerous?

We have no specific security note for port 3237. 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 3237

ServicePortTransportDescriptionReferenceUpdated
apparenet-tps 3237 TCP, UDP appareNet Test Packet Sequencer - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3237, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3237'      # process listening on 3237
sudo lsof -nP -i :3237

macOS

sudo lsof -nP -i :3237

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3237 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3237
netstat -ano | findstr :3237

From another machine

nmap -p 3237 -sV <host>
sudo nmap -sU -p 3237 <host>
nc -zv <host> 3237

Block it in the firewall

sudo ufw deny 3237/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3237" -Direction Inbound -LocalPort 3237 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3237 used for?

Port 3237 is assigned by IANA to apparenet-tps (appareNet Test Packet Sequencer).

Is port 3237 TCP or UDP?

Port 3237 is registered for TCP and UDP.

Is it safe to open port 3237?

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 3237 is open?

On Linux run "ss -ltnup 'sport = :3237'", on macOS "lsof -nP -i :3237", and on Windows "netstat -ano | findstr :3237" to see the local process. From another machine, "nmap -p 3237 <host>" shows whether it is reachable.

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