HTTPfy

Port 8001 (vcom-tunnel)

IANA assigns port 8001 to vcom-tunnel: VCOM Tunnel.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
vcom-tunnel TCP VCOM Tunnel Mark Lewandowski -
vcom-tunnel UDP VCOM Tunnel Mark Lewandowski -

Check what is listening on port 8001

Linux: is anything listening on TCP 8001?
sudo ss -tlnp 'sport = :8001'
Linux: UDP 8001
sudo ss -ulnp 'sport = :8001'
Linux / macOS: which process owns the port
sudo lsof -nP -i :8001
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':8001 '
Windows (Command Prompt)
netstat -ano | findstr :8001
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 8001 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 8001
From Windows
Test-NetConnection HOST -Port 8001
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 8001

Block port 8001 in the firewall

ufw
sudo ufw deny 8001/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 8001 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 8001 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 8001' -Direction Inbound -Protocol TCP -LocalPort 8001 -Action Block
ufw
sudo ufw deny 8001/udp
iptables
sudo iptables -A INPUT -p udp --dport 8001 -j DROP
nftables
sudo nft add rule inet filter input udp dport 8001 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 8001' -Direction Inbound -Protocol UDP -LocalPort 8001 -Action Block

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