CyberHunter
Local dataset, no network
// Other services

Port 1989: MHSnet system

Port 1989 is assigned by IANA to mshnet (MHSnet system), tr-rsrb-p3 (cisco RSRB Priority 3 port).

1989

How mshnet works

Other services
client:1989mshnetresponse client:1989mshnetresponse

The client sends a request to port 1989 and the mshnet service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned2 registered services
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 1989 dangerous?

We have no specific security note for port 1989. 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 1989

ServicePortTransportDescriptionReferenceUpdated
mshnet 1989 TCP, UDP MHSnet system - -
tr-rsrb-p3 1989 TCP, UDP cisco RSRB Priority 3 port - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1989, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1989'      # process listening on 1989
sudo lsof -nP -i :1989

macOS

sudo lsof -nP -i :1989

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1989 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1989
netstat -ano | findstr :1989

From another machine

nmap -p 1989 -sV <host>
sudo nmap -sU -p 1989 <host>
nc -zv <host> 1989

Block it in the firewall

sudo ufw deny 1989/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1989" -Direction Inbound -LocalPort 1989 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1989 used for?

Port 1989 is assigned by IANA to mshnet (MHSnet system), tr-rsrb-p3 (cisco RSRB Priority 3 port).

Is port 1989 TCP or UDP?

Port 1989 is registered for TCP and UDP.

Is it safe to open port 1989?

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 1989 is open?

On Linux run "ss -ltnup 'sport = :1989'", on macOS "lsof -nP -i :1989", and on Windows "netstat -ano | findstr :1989" to see the local process. From another machine, "nmap -p 1989 <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