CyberHunter
Local dataset, no network
// Other services

Port 430: UTMPSD

Port 430 is assigned by IANA to utmpsd (UTMPSD).

430

How utmpsd works

Other services
client:430utmpsdresponse client:430utmpsdresponse

The client sends a request to port 430 and the utmpsd 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 430 dangerous?

We have no specific security note for port 430. 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 430

ServicePortTransportDescriptionReferenceUpdated
utmpsd 430 TCP, UDP UTMPSD - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 430, and is it reachable?

Linux

sudo ss -ltnup 'sport = :430'      # process listening on 430
sudo lsof -nP -i :430

macOS

sudo lsof -nP -i :430

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 430 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 430
netstat -ano | findstr :430

From another machine

nmap -p 430 -sV <host>
sudo nmap -sU -p 430 <host>
nc -zv <host> 430

Block it in the firewall

sudo ufw deny 430/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 430" -Direction Inbound -LocalPort 430 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 430 used for?

Port 430 is assigned by IANA to utmpsd (UTMPSD).

Is port 430 TCP or UDP?

Port 430 is registered for TCP and UDP.

Is it safe to open port 430?

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 430 is open?

On Linux run "ss -ltnup 'sport = :430'", on macOS "lsof -nP -i :430", and on Windows "netstat -ano | findstr :430" to see the local process. From another machine, "nmap -p 430 <host>" shows whether it is reachable.

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