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Port 5820 (autopassdaemon)

IANA assigns port 5820 to autopassdaemon: AutoPass licensing.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference
autopassdaemon TCP AutoPass licensing opentext -

Registry dates for this port: registered 2022-06-10, last modified 2024-08-01.

Check what is listening on port 5820

Linux: is anything listening on TCP 5820?
sudo ss -tlnp 'sport = :5820'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5820
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':5820 '
Windows (Command Prompt)
netstat -ano | findstr :5820
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 5820 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 5820
From Windows
Test-NetConnection HOST -Port 5820

Block port 5820 in the firewall

ufw
sudo ufw deny 5820/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 5820 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 5820 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 5820' -Direction Inbound -Protocol TCP -LocalPort 5820 -Action Block

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