HTTPfy

Port 5746 (fcopys-server)

IANA assigns port 5746 to fcopys-server.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
fcopys-server TCP fcopys-server Moshe Leibovitch -
fcopys-server UDP fcopys-server Moshe Leibovitch -

Check what is listening on port 5746

Linux: is anything listening on TCP 5746?
sudo ss -tlnp 'sport = :5746'
Linux: UDP 5746
sudo ss -ulnp 'sport = :5746'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5746
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':5746 '
Windows (Command Prompt)
netstat -ano | findstr :5746
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 5746 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 5746
From Windows
Test-NetConnection HOST -Port 5746
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 5746

Block port 5746 in the firewall

ufw
sudo ufw deny 5746/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 5746 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 5746 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 5746' -Direction Inbound -Protocol TCP -LocalPort 5746 -Action Block
ufw
sudo ufw deny 5746/udp
iptables
sudo iptables -A INPUT -p udp --dport 5746 -j DROP
nftables
sudo nft add rule inet filter input udp dport 5746 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 5746' -Direction Inbound -Protocol UDP -LocalPort 5746 -Action Block

Related ports

5744watchdoc5745fcopy-server5747tunatic5748tunalyzer

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