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Port 2381 (compaq-https)

IANA assigns port 2381 to compaq-https: Compaq HTTPS.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
compaq-https TCP Compaq HTTPS Scott Shaffer -
compaq-https UDP Compaq HTTPS Scott Shaffer -

Check what is listening on port 2381

Linux: is anything listening on TCP 2381?
sudo ss -tlnp 'sport = :2381'
Linux: UDP 2381
sudo ss -ulnp 'sport = :2381'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2381
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2381 '
Windows (Command Prompt)
netstat -ano | findstr :2381
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2381 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2381
From Windows
Test-NetConnection HOST -Port 2381
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2381

Block port 2381 in the firewall

ufw
sudo ufw deny 2381/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2381 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2381 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2381' -Direction Inbound -Protocol TCP -LocalPort 2381 -Action Block
ufw
sudo ufw deny 2381/udp
iptables
sudo iptables -A INPUT -p udp --dport 2381 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2381 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2381' -Direction Inbound -Protocol UDP -LocalPort 2381 -Action Block

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