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// Other services

Port 3810: WLAN AS server

Port 3810 is assigned by IANA to wlanauth (WLAN AS server).

3810

How wlanauth works

Other services
client:3810wlanauthresponse client:3810wlanauthresponse

The client sends a request to port 3810 and the wlanauth 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 3810 dangerous?

We have no specific security note for port 3810. 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 3810

ServicePortTransportDescriptionReferenceUpdated
wlanauth 3810 TCP, UDP WLAN AS server - 2004-02

// source: IANA service name and port number registry

03 Check it

Which program uses port 3810, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3810'      # process listening on 3810
sudo lsof -nP -i :3810

macOS

sudo lsof -nP -i :3810

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3810 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3810
netstat -ano | findstr :3810

From another machine

nmap -p 3810 -sV <host>
sudo nmap -sU -p 3810 <host>
nc -zv <host> 3810

Block it in the firewall

sudo ufw deny 3810/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3810" -Direction Inbound -LocalPort 3810 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3810 used for?

Port 3810 is assigned by IANA to wlanauth (WLAN AS server).

Is port 3810 TCP or UDP?

Port 3810 is registered for TCP and UDP.

Is it safe to open port 3810?

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 3810 is open?

On Linux run "ss -ltnup 'sport = :3810'", on macOS "lsof -nP -i :3810", and on Windows "netstat -ano | findstr :3810" to see the local process. From another machine, "nmap -p 3810 <host>" shows whether it is reachable.

05 Related
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