HTTPfy

Port 3106 (cardbox-http)

IANA assigns port 3106 to cardbox-http: Cardbox HTTP.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
cardbox-http TCP Cardbox HTTP Martin Kochanski -
cardbox-http UDP Cardbox HTTP Martin Kochanski -

Check what is listening on port 3106

Linux: is anything listening on TCP 3106?
sudo ss -tlnp 'sport = :3106'
Linux: UDP 3106
sudo ss -ulnp 'sport = :3106'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3106
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3106 '
Windows (Command Prompt)
netstat -ano | findstr :3106
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3106 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3106
From Windows
Test-NetConnection HOST -Port 3106
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3106

Block port 3106 in the firewall

ufw
sudo ufw deny 3106/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3106 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3106 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3106' -Direction Inbound -Protocol TCP -LocalPort 3106 -Action Block
ufw
sudo ufw deny 3106/udp
iptables
sudo iptables -A INPUT -p udp --dport 3106 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3106 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3106' -Direction Inbound -Protocol UDP -LocalPort 3106 -Action Block

Related ports

3104autocuelog, autocuetime3105cardbox3107business3108geolocate

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