CyberHunter
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// Other services

Port 3119: D2000 Kernel Port

Port 3119 is assigned by IANA to d2000kernel (D2000 Kernel Port).

3119

How d2000kernel works

Other services
client:3119d2000kernelresponse client:3119d2000kernelresponse

The client sends a request to port 3119 and the d2000kernel 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 3119 dangerous?

We have no specific security note for port 3119. 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 3119

ServicePortTransportDescriptionReferenceUpdated
d2000kernel 3119 TCP, UDP D2000 Kernel Port - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3119, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3119'      # process listening on 3119
sudo lsof -nP -i :3119

macOS

sudo lsof -nP -i :3119

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3119 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3119
netstat -ano | findstr :3119

From another machine

nmap -p 3119 -sV <host>
sudo nmap -sU -p 3119 <host>
nc -zv <host> 3119

Block it in the firewall

sudo ufw deny 3119/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3119" -Direction Inbound -LocalPort 3119 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3119 used for?

Port 3119 is assigned by IANA to d2000kernel (D2000 Kernel Port).

Is port 3119 TCP or UDP?

Port 3119 is registered for TCP and UDP.

Is it safe to open port 3119?

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 3119 is open?

On Linux run "ss -ltnup 'sport = :3119'", on macOS "lsof -nP -i :3119", and on Windows "netstat -ano | findstr :3119" to see the local process. From another machine, "nmap -p 3119 <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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