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// Other services

Port 8937: Transaction Warehouse Data Service

Port 8937 is assigned by IANA to twds (Transaction Warehouse Data Service).

8937

How twds works

Other services
client:8937twdsresponse client:8937twdsresponse

The client sends a request to port 8937 and the twds service answers.

Transport
TCP
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 8937 dangerous?

We have no specific security note for port 8937. 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 8937

ServicePortTransportDescriptionReferenceUpdated
twds 8937 TCP Transaction Warehouse Data Service - 2009-09-18
-8937-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 8937, and is it reachable?

Linux

sudo ss -ltnup 'sport = :8937'      # process listening on 8937
sudo lsof -nP -i :8937

macOS

sudo lsof -nP -i :8937

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 8937 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 8937
netstat -ano | findstr :8937

From another machine

nmap -p 8937 -sV <host>
nc -zv <host> 8937

Block it in the firewall

sudo ufw deny 8937/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 8937" -Direction Inbound -LocalPort 8937 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 8937 used for?

Port 8937 is assigned by IANA to twds (Transaction Warehouse Data Service).

Is port 8937 TCP or UDP?

Port 8937 is registered for TCP.

Is it safe to open port 8937?

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 8937 is open?

On Linux run "ss -ltnup 'sport = :8937'", on macOS "lsof -nP -i :8937", and on Windows "netstat -ano | findstr :8937" to see the local process. From another machine, "nmap -p 8937 <host>" shows whether it is reachable.

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