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Port 829 (pkix-3-ca-ra)

IANA assigns port 829 to pkix-3-ca-ra: PKIX-3 CA/RA.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
pkix-3-ca-ra TCP PKIX-3 CA/RA Carlisle Adams -
pkix-3-ca-ra UDP PKIX-3 CA/RA Carlisle Adams -

Check what is listening on port 829

Linux: is anything listening on TCP 829?
sudo ss -tlnp 'sport = :829'
Linux: UDP 829
sudo ss -ulnp 'sport = :829'
Linux / macOS: which process owns the port
sudo lsof -nP -i :829
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':829 '
Windows (Command Prompt)
netstat -ano | findstr :829
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 829 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 829
From Windows
Test-NetConnection HOST -Port 829
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 829

Block port 829 in the firewall

ufw
sudo ufw deny 829/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 829 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 829 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 829' -Direction Inbound -Protocol TCP -LocalPort 829 -Action Block
ufw
sudo ufw deny 829/udp
iptables
sudo iptables -A INPUT -p udp --dport 829 -j DROP
nftables
sudo nft add rule inet filter input udp dport 829 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 829' -Direction Inbound -Protocol UDP -LocalPort 829 -Action Block

Related ports

810fcp-udp828itm-mcell-s830netconf-ssh847dhcp-failover2

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