CyberHunter
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// Other services

Port 4107: JDL Accounting LAN Service

Port 4107 is assigned by IANA to j-ac (JDL Accounting LAN Service).

4107

How j-ac works

Other services
client:4107j-acresponse client:4107j-acresponse

The client sends a request to port 4107 and the j-ac 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 4107 dangerous?

We have no specific security note for port 4107. 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 4107

ServicePortTransportDescriptionReferenceUpdated
j-ac 4107 TCP, UDP JDL Accounting LAN Service - 2006-09

// source: IANA service name and port number registry

03 Check it

Which program uses port 4107, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4107'      # process listening on 4107
sudo lsof -nP -i :4107

macOS

sudo lsof -nP -i :4107

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4107 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4107
netstat -ano | findstr :4107

From another machine

nmap -p 4107 -sV <host>
sudo nmap -sU -p 4107 <host>
nc -zv <host> 4107

Block it in the firewall

sudo ufw deny 4107/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4107" -Direction Inbound -LocalPort 4107 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4107 used for?

Port 4107 is assigned by IANA to j-ac (JDL Accounting LAN Service).

Is port 4107 TCP or UDP?

Port 4107 is registered for TCP and UDP.

Is it safe to open port 4107?

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 4107 is open?

On Linux run "ss -ltnup 'sport = :4107'", on macOS "lsof -nP -i :4107", and on Windows "netstat -ano | findstr :4107" to see the local process. From another machine, "nmap -p 4107 <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

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