HTTPfy

Port 1554 (caci-lm)

IANA assigns port 1554 to caci-lm: CACI Products Company License Manager.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
caci-lm TCP CACI Products Company License Manager Erik Blume -
caci-lm UDP CACI Products Company License Manager Erik Blume -

Check what is listening on port 1554

Linux: is anything listening on TCP 1554?
sudo ss -tlnp 'sport = :1554'
Linux: UDP 1554
sudo ss -ulnp 'sport = :1554'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1554
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1554 '
Windows (Command Prompt)
netstat -ano | findstr :1554
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1554 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1554
From Windows
Test-NetConnection HOST -Port 1554
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1554

Block port 1554 in the firewall

ufw
sudo ufw deny 1554/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1554 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1554 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1554' -Direction Inbound -Protocol TCP -LocalPort 1554 -Action Block
ufw
sudo ufw deny 1554/udp
iptables
sudo iptables -A INPUT -p udp --dport 1554 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1554 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1554' -Direction Inbound -Protocol UDP -LocalPort 1554 -Action Block

Related ports

1552pciarray1553sna-cs1555livelan1556veritas-pbx, veritas_pbx

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