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Port 419 (ariel1)

IANA assigns port 419 to ariel1: Ariel 1.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
ariel1 TCP Ariel 1 Joel Karafin -
ariel1 UDP Ariel 1 Joel Karafin -

Check what is listening on port 419

Linux: is anything listening on TCP 419?
sudo ss -tlnp 'sport = :419'
Linux: UDP 419
sudo ss -ulnp 'sport = :419'
Linux / macOS: which process owns the port
sudo lsof -nP -i :419
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':419 '
Windows (Command Prompt)
netstat -ano | findstr :419
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 419 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 419
From Windows
Test-NetConnection HOST -Port 419
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 419

Block port 419 in the firewall

ufw
sudo ufw deny 419/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 419 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 419 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 419' -Direction Inbound -Protocol TCP -LocalPort 419 -Action Block
ufw
sudo ufw deny 419/udp
iptables
sudo iptables -A INPUT -p udp --dport 419 -j DROP
nftables
sudo nft add rule inet filter input udp dport 419 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 419' -Direction Inbound -Protocol UDP -LocalPort 419 -Action Block

Related ports

417onmux418hyper-g420smpte421ariel2

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