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Port 1756 (capfast-lmd)

IANA assigns port 1756 to capfast-lmd.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
capfast-lmd TCP capfast-lmd Chuck Neal -
capfast-lmd UDP capfast-lmd Chuck Neal -

Check what is listening on port 1756

Linux: is anything listening on TCP 1756?
sudo ss -tlnp 'sport = :1756'
Linux: UDP 1756
sudo ss -ulnp 'sport = :1756'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1756
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1756 '
Windows (Command Prompt)
netstat -ano | findstr :1756
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1756 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1756
From Windows
Test-NetConnection HOST -Port 1756
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1756

Block port 1756 in the firewall

ufw
sudo ufw deny 1756/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1756 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1756 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1756' -Direction Inbound -Protocol TCP -LocalPort 1756 -Action Block
ufw
sudo ufw deny 1756/udp
iptables
sudo iptables -A INPUT -p udp --dport 1756 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1756 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1756' -Direction Inbound -Protocol UDP -LocalPort 1756 -Action Block

Related ports

1754oracle-em21755ms-streaming1757cnhrp1758tftp-mcast

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