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Port 1629 (lontalk-urgnt)

IANA assigns port 1629 to lontalk-urgnt: LonTalk urgent.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
lontalk-urgnt TCP LonTalk urgent Bob Dolin -
lontalk-urgnt UDP LonTalk urgent Bob Dolin -

Registry dates for this port: registered 2008-04-10.

Check what is listening on port 1629

Linux: is anything listening on TCP 1629?
sudo ss -tlnp 'sport = :1629'
Linux: UDP 1629
sudo ss -ulnp 'sport = :1629'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1629
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1629 '
Windows (Command Prompt)
netstat -ano | findstr :1629
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1629 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1629
From Windows
Test-NetConnection HOST -Port 1629
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1629

Block port 1629 in the firewall

ufw
sudo ufw deny 1629/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1629 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1629 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1629' -Direction Inbound -Protocol TCP -LocalPort 1629 -Action Block
ufw
sudo ufw deny 1629/udp
iptables
sudo iptables -A INPUT -p udp --dport 1629 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1629 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1629' -Direction Inbound -Protocol UDP -LocalPort 1629 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.