Port 469 (rcp)

IANA assigns port 469 to rcp: Radio Control Protocol.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference

rcp TCP Radio Control Protocol Jim Jennings -

rcp UDP Radio Control Protocol Jim Jennings -

Linux: is anything listening on TCP 469?

sudo ss -tlnp 'sport = :469'

Linux: UDP 469

sudo ss -ulnp 'sport = :469'

Linux / macOS: which process owns the port

sudo lsof -nP -i :469

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':469 '

Windows (Command Prompt)

netstat -ano | findstr :469

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 469 -State Listen | Select LocalAddress,OwningProcess

From another machine

nc -vz -w 5 HOST 469

From Windows

Test-NetConnection HOST -Port 469

UDP probe (no reply does not prove it is closed)

nc -vzu -w 5 HOST 469

ufw

sudo ufw deny 469/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 469 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 469 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 469' -Direction Inbound -Protocol TCP -LocalPort 469 -Action Block

ufw

sudo ufw deny 469/udp

iptables

sudo iptables -A INPUT -p udp --dport 469 -j DROP

nftables

sudo nft add rule inet filter input udp dport 469 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block UDP 469' -Direction Inbound -Protocol UDP -LocalPort 469 -Action Block

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