HTTPfy

Port 1717 (fj-hdnet)

IANA assigns port 1717 to fj-hdnet.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
fj-hdnet TCP fj-hdnet Manabu Makino -
fj-hdnet UDP fj-hdnet Manabu Makino -

Check what is listening on port 1717

Linux: is anything listening on TCP 1717?
sudo ss -tlnp 'sport = :1717'
Linux: UDP 1717
sudo ss -ulnp 'sport = :1717'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1717
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1717 '
Windows (Command Prompt)
netstat -ano | findstr :1717
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1717 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1717
From Windows
Test-NetConnection HOST -Port 1717
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1717

Block port 1717 in the firewall

ufw
sudo ufw deny 1717/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1717 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1717 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1717' -Direction Inbound -Protocol TCP -LocalPort 1717 -Action Block
ufw
sudo ufw deny 1717/udp
iptables
sudo iptables -A INPUT -p udp --dport 1717 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1717 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1717' -Direction Inbound -Protocol UDP -LocalPort 1717 -Action Block

Related ports

1715houdini-lm1716xmsg1718h323gatedisc1719h323gatestat

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