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Port 129 (pwdgen)

IANA assigns port 129 to pwdgen: Password Generator Protocol.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
pwdgen TCP Password Generator Protocol Frank J Wacho -
pwdgen UDP Password Generator Protocol Frank J Wacho -

Check what is listening on port 129

Linux: is anything listening on TCP 129?
sudo ss -tlnp 'sport = :129'
Linux: UDP 129
sudo ss -ulnp 'sport = :129'
Linux / macOS: which process owns the port
sudo lsof -nP -i :129
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':129 '
Windows (Command Prompt)
netstat -ano | findstr :129
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 129 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 129
From Windows
Test-NetConnection HOST -Port 129
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 129

Block port 129 in the firewall

ufw
sudo ufw deny 129/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 129 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 129 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 129' -Direction Inbound -Protocol TCP -LocalPort 129 -Action Block
ufw
sudo ufw deny 129/udp
iptables
sudo iptables -A INPUT -p udp --dport 129 -j DROP
nftables
sudo nft add rule inet filter input udp dport 129 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 129' -Direction Inbound -Protocol UDP -LocalPort 129 -Action Block

Related ports

127locus-con128gss-xlicen130cisco-fna131cisco-tna

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