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// Other services

Port 3647: Splitlock Gateway

Port 3647 is assigned by IANA to splitlock-gw (Splitlock Gateway).

3647

How splitlock-gw works

Other services
client:3647splitlock-gwresponse client:3647splitlock-gwresponse

The client sends a request to port 3647 and the splitlock-gw 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 3647 dangerous?

We have no specific security note for port 3647. 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 3647

ServicePortTransportDescriptionReferenceUpdated
splitlock-gw 3647 TCP, UDP Splitlock Gateway - 2003-01

// source: IANA service name and port number registry

03 Check it

Which program uses port 3647, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3647'      # process listening on 3647
sudo lsof -nP -i :3647

macOS

sudo lsof -nP -i :3647

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3647 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3647
netstat -ano | findstr :3647

From another machine

nmap -p 3647 -sV <host>
sudo nmap -sU -p 3647 <host>
nc -zv <host> 3647

Block it in the firewall

sudo ufw deny 3647/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3647" -Direction Inbound -LocalPort 3647 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3647 used for?

Port 3647 is assigned by IANA to splitlock-gw (Splitlock Gateway).

Is port 3647 TCP or UDP?

Port 3647 is registered for TCP and UDP.

Is it safe to open port 3647?

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 3647 is open?

On Linux run "ss -ltnup 'sport = :3647'", on macOS "lsof -nP -i :3647", and on Windows "netstat -ano | findstr :3647" to see the local process. From another machine, "nmap -p 3647 <host>" shows whether it is reachable.

05 Related
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