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Port 11371 (hkp)

IANA assigns port 11371 to hkp: OpenPGP HTTP Keyserver.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
hkp TCP OpenPGP HTTP Keyserver David Shaw -
hkp UDP OpenPGP HTTP Keyserver David Shaw -

Registry dates for this port: registered 2003-05.

Check what is listening on port 11371

Linux: is anything listening on TCP 11371?
sudo ss -tlnp 'sport = :11371'
Linux: UDP 11371
sudo ss -ulnp 'sport = :11371'
Linux / macOS: which process owns the port
sudo lsof -nP -i :11371
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':11371 '
Windows (Command Prompt)
netstat -ano | findstr :11371
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 11371 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 11371
From Windows
Test-NetConnection HOST -Port 11371
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 11371

Block port 11371 in the firewall

ufw
sudo ufw deny 11371/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 11371 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 11371 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 11371' -Direction Inbound -Protocol TCP -LocalPort 11371 -Action Block
ufw
sudo ufw deny 11371/udp
iptables
sudo iptables -A INPUT -p udp --dport 11371 -j DROP
nftables
sudo nft add rule inet filter input udp dport 11371 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 11371' -Direction Inbound -Protocol UDP -LocalPort 11371 -Action Block

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