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// Other services

Port 450: Computer Supported Telecomunication Applications

Port 450 is assigned by IANA to tserver (Computer Supported Telecomunication Applications).

450

How tserver works

Other services
client:450tserverresponse client:450tserverresponse

The client sends a request to port 450 and the tserver 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 450 dangerous?

We have no specific security note for port 450. 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 450

ServicePortTransportDescriptionReferenceUpdated
tserver 450 TCP, UDP Computer Supported Telecomunication Applications - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 450, and is it reachable?

Linux

sudo ss -ltnup 'sport = :450'      # process listening on 450
sudo lsof -nP -i :450

macOS

sudo lsof -nP -i :450

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 450 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 450
netstat -ano | findstr :450

From another machine

nmap -p 450 -sV <host>
sudo nmap -sU -p 450 <host>
nc -zv <host> 450

Block it in the firewall

sudo ufw deny 450/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 450" -Direction Inbound -LocalPort 450 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 450 used for?

Port 450 is assigned by IANA to tserver (Computer Supported Telecomunication Applications).

Is port 450 TCP or UDP?

Port 450 is registered for TCP and UDP.

Is it safe to open port 450?

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 450 is open?

On Linux run "ss -ltnup 'sport = :450'", on macOS "lsof -nP -i :450", and on Windows "netstat -ano | findstr :450" to see the local process. From another machine, "nmap -p 450 <host>" shows whether it is reachable.

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