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// Other services

Port 3737: XPanel Daemon

Port 3737 is assigned by IANA to xpanel (XPanel Daemon).

3737

How xpanel works

Other services
client:3737xpanelresponse client:3737xpanelresponse

The client sends a request to port 3737 and the xpanel 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 3737 dangerous?

We have no specific security note for port 3737. 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 3737

ServicePortTransportDescriptionReferenceUpdated
xpanel 3737 TCP XPanel Daemon - 2009-03-04
-3737-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 3737, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3737'      # process listening on 3737
sudo lsof -nP -i :3737

macOS

sudo lsof -nP -i :3737

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3737 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3737
netstat -ano | findstr :3737

From another machine

nmap -p 3737 -sV <host>
nc -zv <host> 3737

Block it in the firewall

sudo ufw deny 3737/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3737" -Direction Inbound -LocalPort 3737 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3737 used for?

Port 3737 is assigned by IANA to xpanel (XPanel Daemon).

Is port 3737 TCP or UDP?

Port 3737 is registered for TCP.

Is it safe to open port 3737?

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 3737 is open?

On Linux run "ss -ltnup 'sport = :3737'", on macOS "lsof -nP -i :3737", and on Windows "netstat -ano | findstr :3737" to see the local process. From another machine, "nmap -p 3737 <host>" shows whether it is reachable.

05 Related
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