CyberHunter
Local dataset, no network
// Other services

Port 4989: Parallel for GAUSS (tm)

Port 4989 is assigned by IANA to parallel (Parallel for GAUSS (tm)).

4989

How parallel works

Other services
client:4989parallelresponse client:4989parallelresponse

The client sends a request to port 4989 and the parallel 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 4989 dangerous?

We have no specific security note for port 4989. 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 4989

ServicePortTransportDescriptionReferenceUpdated
parallel 4989 TCP, UDP Parallel for GAUSS (tm) - 2003-03

// source: IANA service name and port number registry

03 Check it

Which program uses port 4989, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4989'      # process listening on 4989
sudo lsof -nP -i :4989

macOS

sudo lsof -nP -i :4989

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4989 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4989
netstat -ano | findstr :4989

From another machine

nmap -p 4989 -sV <host>
sudo nmap -sU -p 4989 <host>
nc -zv <host> 4989

Block it in the firewall

sudo ufw deny 4989/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4989" -Direction Inbound -LocalPort 4989 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4989 used for?

Port 4989 is assigned by IANA to parallel (Parallel for GAUSS (tm)).

Is port 4989 TCP or UDP?

Port 4989 is registered for TCP and UDP.

Is it safe to open port 4989?

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 4989 is open?

On Linux run "ss -ltnup 'sport = :4989'", on macOS "lsof -nP -i :4989", and on Windows "netstat -ano | findstr :4989" to see the local process. From another machine, "nmap -p 4989 <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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