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// Other services

Port 689: NMAP

Port 689 is assigned by IANA to nmap (NMAP).

689

How nmap works

Other services
client:689nmapresponse client:689nmapresponse

The client sends a request to port 689 and the nmap 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
Well-known (0-1023)
Category
Other services
01 Security

Is port 689 dangerous?

We have no specific security note for port 689. 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 689

ServicePortTransportDescriptionReferenceUpdated
nmap 689 TCP, UDP NMAP - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 689, and is it reachable?

Linux

sudo ss -ltnup 'sport = :689'      # process listening on 689
sudo lsof -nP -i :689

macOS

sudo lsof -nP -i :689

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 689 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 689
netstat -ano | findstr :689

From another machine

nmap -p 689 -sV <host>
sudo nmap -sU -p 689 <host>
nc -zv <host> 689

Block it in the firewall

sudo ufw deny 689/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 689" -Direction Inbound -LocalPort 689 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 689 used for?

Port 689 is assigned by IANA to nmap (NMAP).

Is port 689 TCP or UDP?

Port 689 is registered for TCP and UDP.

Is it safe to open port 689?

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 689 is open?

On Linux run "ss -ltnup 'sport = :689'", on macOS "lsof -nP -i :689", and on Windows "netstat -ano | findstr :689" to see the local process. From another machine, "nmap -p 689 <host>" shows whether it is reachable.

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