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Port 6222 (radmind)

IANA assigns port 6222 to radmind: Radmind Access Protocol.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
radmind TCP Radmind Access Protocol Patrick M McNeal -
radmind UDP Radmind Access Protocol Patrick M McNeal -

Registry dates for this port: registered 2006-03.

Check what is listening on port 6222

Linux: is anything listening on TCP 6222?
sudo ss -tlnp 'sport = :6222'
Linux: UDP 6222
sudo ss -ulnp 'sport = :6222'
Linux / macOS: which process owns the port
sudo lsof -nP -i :6222
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':6222 '
Windows (Command Prompt)
netstat -ano | findstr :6222
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 6222 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 6222
From Windows
Test-NetConnection HOST -Port 6222
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 6222

Block port 6222 in the firewall

ufw
sudo ufw deny 6222/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 6222 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 6222 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 6222' -Direction Inbound -Protocol TCP -LocalPort 6222 -Action Block
ufw
sudo ufw deny 6222/udp
iptables
sudo iptables -A INPUT -p udp --dport 6222 -j DROP
nftables
sudo nft add rule inet filter input udp dport 6222 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 6222' -Direction Inbound -Protocol UDP -LocalPort 6222 -Action Block

Related ports

6201thermo-calc6209qmtps6241jeol-nsdtp-1, jeol-nsddp-16242jeol-nsdtp-2, jeol-nsddp-2

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