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Port 20202 (ipdtp-port)

IANA assigns port 20202 to ipdtp-port: IPD Tunneling Port.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ipdtp-port TCP IPD Tunneling Port Vikki Yin Wei -
ipdtp-port UDP IPD Tunneling Port Vikki Yin Wei -

Registry dates for this port: registered 2003-01.

Check what is listening on port 20202

Linux: is anything listening on TCP 20202?
sudo ss -tlnp 'sport = :20202'
Linux: UDP 20202
sudo ss -ulnp 'sport = :20202'
Linux / macOS: which process owns the port
sudo lsof -nP -i :20202
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':20202 '
Windows (Command Prompt)
netstat -ano | findstr :20202
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 20202 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 20202
From Windows
Test-NetConnection HOST -Port 20202
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 20202

Block port 20202 in the firewall

ufw
sudo ufw deny 20202/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 20202 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 20202 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 20202' -Direction Inbound -Protocol TCP -LocalPort 20202 -Action Block
ufw
sudo ufw deny 20202/udp
iptables
sudo iptables -A INPUT -p udp --dport 20202 -j DROP
nftables
sudo nft add rule inet filter input udp dport 20202 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 20202' -Direction Inbound -Protocol UDP -LocalPort 20202 -Action Block

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