HTTPfy

Port 1752 (lofr-lm)

IANA assigns port 1752 to lofr-lm: Leap of Faith Research License Manager.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
lofr-lm TCP Leap of Faith Research License Manager - -
lofr-lm UDP Leap of Faith Research License Manager - -

Check what is listening on port 1752

Linux: is anything listening on TCP 1752?
sudo ss -tlnp 'sport = :1752'
Linux: UDP 1752
sudo ss -ulnp 'sport = :1752'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1752
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1752 '
Windows (Command Prompt)
netstat -ano | findstr :1752
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1752 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1752
From Windows
Test-NetConnection HOST -Port 1752
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1752

Block port 1752 in the firewall

ufw
sudo ufw deny 1752/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1752 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1752 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1752' -Direction Inbound -Protocol TCP -LocalPort 1752 -Action Block
ufw
sudo ufw deny 1752/udp
iptables
sudo iptables -A INPUT -p udp --dport 1752 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1752 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1752' -Direction Inbound -Protocol UDP -LocalPort 1752 -Action Block

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