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Port 1763 (cft-2)

IANA assigns port 1763 to cft-2.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
cft-2 TCP cft-2 Martine Marchand -
cft-2 UDP cft-2 Martine Marchand -

Check what is listening on port 1763

Linux: is anything listening on TCP 1763?
sudo ss -tlnp 'sport = :1763'
Linux: UDP 1763
sudo ss -ulnp 'sport = :1763'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1763
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1763 '
Windows (Command Prompt)
netstat -ano | findstr :1763
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1763 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1763
From Windows
Test-NetConnection HOST -Port 1763
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1763

Block port 1763 in the firewall

ufw
sudo ufw deny 1763/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1763 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1763 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1763' -Direction Inbound -Protocol TCP -LocalPort 1763 -Action Block
ufw
sudo ufw deny 1763/udp
iptables
sudo iptables -A INPUT -p udp --dport 1763 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1763 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1763' -Direction Inbound -Protocol UDP -LocalPort 1763 -Action Block

Related ports

1761cft-01762cft-11764cft-31765cft-4

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