CyberHunter
Local dataset, no network
// Other services

Port 489: nest-protocol

Port 489 is assigned by IANA to nest-protocol (nest-protocol).

489

How nest-protocol works

Other services
client:489nest-protocolresponse client:489nest-protocolresponse

The client sends a request to port 489 and the nest-protocol 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 489 dangerous?

We have no specific security note for port 489. 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 489

ServicePortTransportDescriptionReferenceUpdated
nest-protocol 489 TCP, UDP nest-protocol - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 489, and is it reachable?

Linux

sudo ss -ltnup 'sport = :489'      # process listening on 489
sudo lsof -nP -i :489

macOS

sudo lsof -nP -i :489

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 489 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 489
netstat -ano | findstr :489

From another machine

nmap -p 489 -sV <host>
sudo nmap -sU -p 489 <host>
nc -zv <host> 489

Block it in the firewall

sudo ufw deny 489/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 489" -Direction Inbound -LocalPort 489 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 489 used for?

Port 489 is assigned by IANA to nest-protocol (nest-protocol).

Is port 489 TCP or UDP?

Port 489 is registered for TCP and UDP.

Is it safe to open port 489?

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 489 is open?

On Linux run "ss -ltnup 'sport = :489'", on macOS "lsof -nP -i :489", and on Windows "netstat -ano | findstr :489" to see the local process. From another machine, "nmap -p 489 <host>" shows whether it is reachable.

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