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Port 9021 (panagolin-ident)

IANA assigns port 9021 to panagolin-ident: Pangolin Identification.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
panagolin-ident TCP Pangolin Identification William Benner -
panagolin-ident UDP Pangolin Identification William Benner -

Registry dates for this port: registered 2002-03.

Check what is listening on port 9021

Linux: is anything listening on TCP 9021?
sudo ss -tlnp 'sport = :9021'
Linux: UDP 9021
sudo ss -ulnp 'sport = :9021'
Linux / macOS: which process owns the port
sudo lsof -nP -i :9021
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':9021 '
Windows (Command Prompt)
netstat -ano | findstr :9021
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 9021 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 9021
From Windows
Test-NetConnection HOST -Port 9021
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 9021

Block port 9021 in the firewall

ufw
sudo ufw deny 9021/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 9021 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 9021 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 9021' -Direction Inbound -Protocol TCP -LocalPort 9021 -Action Block
ufw
sudo ufw deny 9021/udp
iptables
sudo iptables -A INPUT -p udp --dport 9021 -j DROP
nftables
sudo nft add rule inet filter input udp dport 9021 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 9021' -Direction Inbound -Protocol UDP -LocalPort 9021 -Action Block

Related ports

9011d-star9020tambora9022paragent9023swa-1

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