HTTPfy

Port 7022 (ctdp)

IANA assigns port 7022 to ctdp: CT Discovery Protocol.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ctdp TCP CT Discovery Protocol James Kirkwood -
ctdp UDP CT Discovery Protocol James Kirkwood -

Registry dates for this port: registered 2005-06.

Check what is listening on port 7022

Linux: is anything listening on TCP 7022?
sudo ss -tlnp 'sport = :7022'
Linux: UDP 7022
sudo ss -ulnp 'sport = :7022'
Linux / macOS: which process owns the port
sudo lsof -nP -i :7022
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':7022 '
Windows (Command Prompt)
netstat -ano | findstr :7022
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 7022 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 7022
From Windows
Test-NetConnection HOST -Port 7022
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 7022

Block port 7022 in the firewall

ufw
sudo ufw deny 7022/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 7022 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 7022 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 7022' -Direction Inbound -Protocol TCP -LocalPort 7022 -Action Block
ufw
sudo ufw deny 7022/udp
iptables
sudo iptables -A INPUT -p udp --dport 7022 -j DROP
nftables
sudo nft add rule inet filter input udp dport 7022 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 7022' -Direction Inbound -Protocol UDP -LocalPort 7022 -Action Block

Related ports

7020dpserve7021dpserveadmin7023ct2nmcs7024vmsvc

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