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// Other services

Port 2504: WLBS

Port 2504 is assigned by IANA to wlbs (WLBS).

2504

How wlbs works

Other services
client:2504wlbsresponse client:2504wlbsresponse

The client sends a request to port 2504 and the wlbs 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 2504 dangerous?

We have no specific security note for port 2504. 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 2504

ServicePortTransportDescriptionReferenceUpdated
wlbs 2504 TCP, UDP WLBS - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2504, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2504'      # process listening on 2504
sudo lsof -nP -i :2504

macOS

sudo lsof -nP -i :2504

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2504 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2504
netstat -ano | findstr :2504

From another machine

nmap -p 2504 -sV <host>
sudo nmap -sU -p 2504 <host>
nc -zv <host> 2504

Block it in the firewall

sudo ufw deny 2504/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2504" -Direction Inbound -LocalPort 2504 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2504 used for?

Port 2504 is assigned by IANA to wlbs (WLBS).

Is port 2504 TCP or UDP?

Port 2504 is registered for TCP and UDP.

Is it safe to open port 2504?

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 2504 is open?

On Linux run "ss -ltnup 'sport = :2504'", on macOS "lsof -nP -i :2504", and on Windows "netstat -ano | findstr :2504" to see the local process. From another machine, "nmap -p 2504 <host>" shows whether it is reachable.

05 Related
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