CyberHunter
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// Other services

Port 2938: SM-PAS-1

Port 2938 is assigned by IANA to sm-pas-1 (SM-PAS-1).

2938

How sm-pas-1 works

Other services
client:2938sm-pas-1response client:2938sm-pas-1response

The client sends a request to port 2938 and the sm-pas-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 2938 dangerous?

We have no specific security note for port 2938. 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 2938

ServicePortTransportDescriptionReferenceUpdated
sm-pas-1 2938 TCP, UDP SM-PAS-1 - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2938, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2938'      # process listening on 2938
sudo lsof -nP -i :2938

macOS

sudo lsof -nP -i :2938

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2938 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2938
netstat -ano | findstr :2938

From another machine

nmap -p 2938 -sV <host>
sudo nmap -sU -p 2938 <host>
nc -zv <host> 2938

Block it in the firewall

sudo ufw deny 2938/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2938" -Direction Inbound -LocalPort 2938 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2938 used for?

Port 2938 is assigned by IANA to sm-pas-1 (SM-PAS-1).

Is port 2938 TCP or UDP?

Port 2938 is registered for TCP and UDP.

Is it safe to open port 2938?

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 2938 is open?

On Linux run "ss -ltnup 'sport = :2938'", on macOS "lsof -nP -i :2938", and on Windows "netstat -ano | findstr :2938" to see the local process. From another machine, "nmap -p 2938 <host>" shows whether it is reachable.

05 Related
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