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Port 22335 (shrewd-control, shrewd-stream)

IANA assigns port 22335 to shrewd-control, shrewd-stream: Initium Labs Security and Automation Control.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
shrewd-control TCP Initium Labs Security and Automation Control Initium Labs LLC -
shrewd-stream UDP Initium Labs Security and Automation Streaming Initium Labs LLC -

Registry dates for this port: registered 2015-03-06.

Check what is listening on port 22335

Linux: is anything listening on TCP 22335?
sudo ss -tlnp 'sport = :22335'
Linux: UDP 22335
sudo ss -ulnp 'sport = :22335'
Linux / macOS: which process owns the port
sudo lsof -nP -i :22335
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':22335 '
Windows (Command Prompt)
netstat -ano | findstr :22335
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 22335 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 22335
From Windows
Test-NetConnection HOST -Port 22335
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 22335

Block port 22335 in the firewall

ufw
sudo ufw deny 22335/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 22335 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 22335 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 22335' -Direction Inbound -Protocol TCP -LocalPort 22335 -Action Block
ufw
sudo ufw deny 22335/udp
iptables
sudo iptables -A INPUT -p udp --dport 22335 -j DROP
nftables
sudo nft add rule inet filter input udp dport 22335 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 22335' -Direction Inbound -Protocol UDP -LocalPort 22335 -Action Block

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