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// Other services

Port 1628: LonTalk normal

Port 1628 is assigned by IANA to lontalk-norm (LonTalk normal).

1628

How lontalk-norm works

Other services
client:1628lontalk-normresponse client:1628lontalk-normresponse

The client sends a request to port 1628 and the lontalk-norm 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 1628 dangerous?

We have no specific security note for port 1628. 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 1628

ServicePortTransportDescriptionReferenceUpdated
lontalk-norm 1628 TCP, UDP LonTalk normal - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1628, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1628'      # process listening on 1628
sudo lsof -nP -i :1628

macOS

sudo lsof -nP -i :1628

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1628 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1628
netstat -ano | findstr :1628

From another machine

nmap -p 1628 -sV <host>
sudo nmap -sU -p 1628 <host>
nc -zv <host> 1628

Block it in the firewall

sudo ufw deny 1628/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1628" -Direction Inbound -LocalPort 1628 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1628 used for?

Port 1628 is assigned by IANA to lontalk-norm (LonTalk normal).

Is port 1628 TCP or UDP?

Port 1628 is registered for TCP and UDP.

Is it safe to open port 1628?

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 1628 is open?

On Linux run "ss -ltnup 'sport = :1628'", on macOS "lsof -nP -i :1628", and on Windows "netstat -ano | findstr :1628" to see the local process. From another machine, "nmap -p 1628 <host>" shows whether it is reachable.

05 Related
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