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Port 1443 (ies-lm)

IANA assigns port 1443 to ies-lm: Integrated Engineering Software.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ies-lm TCP Integrated Engineering Software David Tong -
ies-lm UDP Integrated Engineering Software David Tong -

Check what is listening on port 1443

Linux: is anything listening on TCP 1443?
sudo ss -tlnp 'sport = :1443'
Linux: UDP 1443
sudo ss -ulnp 'sport = :1443'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1443
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1443 '
Windows (Command Prompt)
netstat -ano | findstr :1443
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1443 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1443
From Windows
Test-NetConnection HOST -Port 1443
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1443

Block port 1443 in the firewall

ufw
sudo ufw deny 1443/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1443 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1443 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1443' -Direction Inbound -Protocol TCP -LocalPort 1443 -Action Block
ufw
sudo ufw deny 1443/udp
iptables
sudo iptables -A INPUT -p udp --dport 1443 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1443 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1443' -Direction Inbound -Protocol UDP -LocalPort 1443 -Action Block

Related ports

1441cadis-11442cadis-21444marcam-lm1445proxima-lm

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