HTTPfy

Port 6946 (bioserver)

IANA assigns port 6946 to bioserver: Biometrics Server.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
bioserver TCP Biometrics Server ISHII AKIO -
bioserver UDP Biometrics Server ISHII AKIO -

Registry dates for this port: registered 2006-01.

Check what is listening on port 6946

Linux: is anything listening on TCP 6946?
sudo ss -tlnp 'sport = :6946'
Linux: UDP 6946
sudo ss -ulnp 'sport = :6946'
Linux / macOS: which process owns the port
sudo lsof -nP -i :6946
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':6946 '
Windows (Command Prompt)
netstat -ano | findstr :6946
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 6946 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 6946
From Windows
Test-NetConnection HOST -Port 6946
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 6946

Block port 6946 in the firewall

ufw
sudo ufw deny 6946/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 6946 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 6946 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 6946' -Direction Inbound -Protocol TCP -LocalPort 6946 -Action Block
ufw
sudo ufw deny 6946/udp
iptables
sudo iptables -A INPUT -p udp --dport 6946 -j DROP
nftables
sudo nft add rule inet filter input udp dport 6946 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 6946' -Direction Inbound -Protocol UDP -LocalPort 6946 -Action Block

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