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// Other services

Port 1629: LonTalk urgent

Port 1629 is assigned by IANA to lontalk-urgnt (LonTalk urgent).

1629

How lontalk-urgnt works

Other services
client:1629lontalk-urgntresponse client:1629lontalk-urgntresponse

The client sends a request to port 1629 and the lontalk-urgnt 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 1629 dangerous?

We have no specific security note for port 1629. 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 1629

ServicePortTransportDescriptionReferenceUpdated
lontalk-urgnt 1629 TCP, UDP LonTalk urgent - 2008-04-10

// source: IANA service name and port number registry

03 Check it

Which program uses port 1629, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1629'      # process listening on 1629
sudo lsof -nP -i :1629

macOS

sudo lsof -nP -i :1629

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1629 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1629
netstat -ano | findstr :1629

From another machine

nmap -p 1629 -sV <host>
sudo nmap -sU -p 1629 <host>
nc -zv <host> 1629

Block it in the firewall

sudo ufw deny 1629/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1629" -Direction Inbound -LocalPort 1629 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1629 used for?

Port 1629 is assigned by IANA to lontalk-urgnt (LonTalk urgent).

Is port 1629 TCP or UDP?

Port 1629 is registered for TCP and UDP.

Is it safe to open port 1629?

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 1629 is open?

On Linux run "ss -ltnup 'sport = :1629'", on macOS "lsof -nP -i :1629", and on Windows "netstat -ano | findstr :1629" to see the local process. From another machine, "nmap -p 1629 <host>" shows whether it is reachable.

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