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// Other services

Port 463: alpes

Port 463 is assigned by IANA to alpes (alpes).

463

How alpes works

Other services
client:463alpesresponse client:463alpesresponse

The client sends a request to port 463 and the alpes 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 463 dangerous?

We have no specific security note for port 463. 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 463

ServicePortTransportDescriptionReferenceUpdated
alpes 463 TCP, UDP alpes - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 463, and is it reachable?

Linux

sudo ss -ltnup 'sport = :463'      # process listening on 463
sudo lsof -nP -i :463

macOS

sudo lsof -nP -i :463

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 463 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 463
netstat -ano | findstr :463

From another machine

nmap -p 463 -sV <host>
sudo nmap -sU -p 463 <host>
nc -zv <host> 463

Block it in the firewall

sudo ufw deny 463/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 463" -Direction Inbound -LocalPort 463 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 463 used for?

Port 463 is assigned by IANA to alpes (alpes).

Is port 463 TCP or UDP?

Port 463 is registered for TCP and UDP.

Is it safe to open port 463?

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 463 is open?

On Linux run "ss -ltnup 'sport = :463'", on macOS "lsof -nP -i :463", and on Windows "netstat -ano | findstr :463" to see the local process. From another machine, "nmap -p 463 <host>" shows whether it is reachable.

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