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Port 3233 (whisker)

IANA assigns port 3233 to whisker: WhiskerControl main port.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
whisker TCP WhiskerControl main port Rudolf Cardinal -
whisker UDP WhiskerControl main port Rudolf Cardinal -

Registry dates for this port: registered 2002-02.

Check what is listening on port 3233

Linux: is anything listening on TCP 3233?
sudo ss -tlnp 'sport = :3233'
Linux: UDP 3233
sudo ss -ulnp 'sport = :3233'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3233
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3233 '
Windows (Command Prompt)
netstat -ano | findstr :3233
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3233 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3233
From Windows
Test-NetConnection HOST -Port 3233
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3233

Block port 3233 in the firewall

ufw
sudo ufw deny 3233/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3233 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3233 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3233' -Direction Inbound -Protocol TCP -LocalPort 3233 -Action Block
ufw
sudo ufw deny 3233/udp
iptables
sudo iptables -A INPUT -p udp --dport 3233 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3233 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3233' -Direction Inbound -Protocol UDP -LocalPort 3233 -Action Block

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