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// Other services

Port 3913: ListCREATOR Port

Port 3913 is assigned by IANA to listcrt-port (ListCREATOR Port).

3913

How listcrt-port works

Other services
client:3913listcrt-portresponse client:3913listcrt-portresponse

The client sends a request to port 3913 and the listcrt-port 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 3913 dangerous?

We have no specific security note for port 3913. 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 3913

ServicePortTransportDescriptionReferenceUpdated
listcrt-port 3913 TCP, UDP ListCREATOR Port - 2003-11

// source: IANA service name and port number registry

03 Check it

Which program uses port 3913, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3913'      # process listening on 3913
sudo lsof -nP -i :3913

macOS

sudo lsof -nP -i :3913

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3913 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3913
netstat -ano | findstr :3913

From another machine

nmap -p 3913 -sV <host>
sudo nmap -sU -p 3913 <host>
nc -zv <host> 3913

Block it in the firewall

sudo ufw deny 3913/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3913" -Direction Inbound -LocalPort 3913 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3913 used for?

Port 3913 is assigned by IANA to listcrt-port (ListCREATOR Port).

Is port 3913 TCP or UDP?

Port 3913 is registered for TCP and UDP.

Is it safe to open port 3913?

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 3913 is open?

On Linux run "ss -ltnup 'sport = :3913'", on macOS "lsof -nP -i :3913", and on Windows "netstat -ano | findstr :3913" to see the local process. From another machine, "nmap -p 3913 <host>" shows whether it is reachable.

05 Related
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