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Port 1441 (cadis-1)

IANA assigns port 1441 to cadis-1: Cadis License Management.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
cadis-1 TCP Cadis License Management - -
cadis-1 UDP Cadis License Management - -

Check what is listening on port 1441

Linux: is anything listening on TCP 1441?
sudo ss -tlnp 'sport = :1441'
Linux: UDP 1441
sudo ss -ulnp 'sport = :1441'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1441
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1441 '
Windows (Command Prompt)
netstat -ano | findstr :1441
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1441 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1441
From Windows
Test-NetConnection HOST -Port 1441
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1441

Block port 1441 in the firewall

ufw
sudo ufw deny 1441/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1441 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1441 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1441' -Direction Inbound -Protocol TCP -LocalPort 1441 -Action Block
ufw
sudo ufw deny 1441/udp
iptables
sudo iptables -A INPUT -p udp --dport 1441 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1441 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1441' -Direction Inbound -Protocol UDP -LocalPort 1441 -Action Block

Related ports

1439eicon-x251440eicon-slp1442cadis-21443ies-lm

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