CyberHunter
LinkedIn profile - Bastien Cordier Email: contact@bastiencordier.pro
// Other services

Port 4913: LUTher Control Protocol

Port 4913 is assigned by IANA to lutcp (LUTher Control Protocol).

4913

How lutcp works

Other services
client:4913lutcpresponse client:4913lutcpresponse

The client sends a request to port 4913 and the lutcp 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 4913 dangerous?

We have no specific security note for port 4913. 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 4913

ServicePortTransportDescriptionReferenceUpdated
lutcp 4913 TCP LUTher Control Protocol - 2007-07-03

// source: IANA service name and port number registry

03 Check it

Which program uses port 4913, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4913'      # process listening on 4913
sudo lsof -nP -i :4913

macOS

sudo lsof -nP -i :4913

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4913 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4913
netstat -ano | findstr :4913

From another machine

nmap -p 4913 -sV <host>
nc -zv <host> 4913

Block it in the firewall

sudo ufw deny 4913/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4913" -Direction Inbound -LocalPort 4913 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4913 used for?

Port 4913 is assigned by IANA to lutcp (LUTher Control Protocol).

Is port 4913 TCP or UDP?

Port 4913 is registered for TCP.

Is it safe to open port 4913?

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 4913 is open?

On Linux run "ss -ltnup 'sport = :4913'", on macOS "lsof -nP -i :4913", and on Windows "netstat -ano | findstr :4913" to see the local process. From another machine, "nmap -p 4913 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

Latest vulnerability news

All news