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// Other services

Port 3606: Splitlock Server

Port 3606 is assigned by IANA to splitlock (Splitlock Server).

3606

How splitlock works

Other services
client:3606splitlockresponse client:3606splitlockresponse

The client sends a request to port 3606 and the splitlock 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 3606 dangerous?

We have no specific security note for port 3606. 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 3606

ServicePortTransportDescriptionReferenceUpdated
splitlock 3606 TCP, UDP Splitlock Server - 2002-09

// source: IANA service name and port number registry

03 Check it

Which program uses port 3606, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3606'      # process listening on 3606
sudo lsof -nP -i :3606

macOS

sudo lsof -nP -i :3606

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3606 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3606
netstat -ano | findstr :3606

From another machine

nmap -p 3606 -sV <host>
sudo nmap -sU -p 3606 <host>
nc -zv <host> 3606

Block it in the firewall

sudo ufw deny 3606/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3606" -Direction Inbound -LocalPort 3606 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3606 used for?

Port 3606 is assigned by IANA to splitlock (Splitlock Server).

Is port 3606 TCP or UDP?

Port 3606 is registered for TCP and UDP.

Is it safe to open port 3606?

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 3606 is open?

On Linux run "ss -ltnup 'sport = :3606'", on macOS "lsof -nP -i :3606", and on Windows "netstat -ano | findstr :3606" to see the local process. From another machine, "nmap -p 3606 <host>" shows whether it is reachable.

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