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Port 629 (3com-amp3)

IANA assigns port 629 to 3com-amp3: 3Com AMP3.

Well-known (system) port, 0-1023 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
3com-amp3 TCP 3Com AMP3 Prakash Banthia -
3com-amp3 UDP 3Com AMP3 Prakash Banthia -

Check what is listening on port 629

Linux: is anything listening on TCP 629?
sudo ss -tlnp 'sport = :629'
Linux: UDP 629
sudo ss -ulnp 'sport = :629'
Linux / macOS: which process owns the port
sudo lsof -nP -i :629
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':629 '
Windows (Command Prompt)
netstat -ano | findstr :629
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 629 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 629
From Windows
Test-NetConnection HOST -Port 629
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 629

Block port 629 in the firewall

ufw
sudo ufw deny 629/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 629 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 629 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 629' -Direction Inbound -Protocol TCP -LocalPort 629 -Action Block
ufw
sudo ufw deny 629/udp
iptables
sudo iptables -A INPUT -p udp --dport 629 -j DROP
nftables
sudo nft add rule inet filter input udp dport 629 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 629' -Direction Inbound -Protocol UDP -LocalPort 629 -Action Block

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All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.