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// Other services

Port 4663: Note It! Message Service

Port 4663 is assigned by IANA to noteit (Note It! Message Service).

4663

How noteit works

Other services
client:4663noteitresponse client:4663noteitresponse

The client sends a request to port 4663 and the noteit 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 4663 dangerous?

We have no specific security note for port 4663. 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 4663

ServicePortTransportDescriptionReferenceUpdated
noteit 4663 TCP, UDP Note It! Message Service - 2006-02

// source: IANA service name and port number registry

03 Check it

Which program uses port 4663, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4663'      # process listening on 4663
sudo lsof -nP -i :4663

macOS

sudo lsof -nP -i :4663

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4663 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4663
netstat -ano | findstr :4663

From another machine

nmap -p 4663 -sV <host>
sudo nmap -sU -p 4663 <host>
nc -zv <host> 4663

Block it in the firewall

sudo ufw deny 4663/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4663" -Direction Inbound -LocalPort 4663 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4663 used for?

Port 4663 is assigned by IANA to noteit (Note It! Message Service).

Is port 4663 TCP or UDP?

Port 4663 is registered for TCP and UDP.

Is it safe to open port 4663?

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 4663 is open?

On Linux run "ss -ltnup 'sport = :4663'", on macOS "lsof -nP -i :4663", and on Windows "netstat -ano | findstr :4663" to see the local process. From another machine, "nmap -p 4663 <host>" shows whether it is reachable.

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