Port 1762 (cft-1)

IANA assigns port 1762 to cft-1.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference

cft-1 TCP cft-1 Martine Marchand -

cft-1 UDP cft-1 Martine Marchand -

Linux: is anything listening on TCP 1762?

sudo ss -tlnp 'sport = :1762'

Linux: UDP 1762

sudo ss -ulnp 'sport = :1762'

Linux / macOS: which process owns the port

sudo lsof -nP -i :1762

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':1762 '

Windows (Command Prompt)

netstat -ano | findstr :1762

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1762 -State Listen | Select LocalAddress,OwningProcess

From another machine

nc -vz -w 5 HOST 1762

From Windows

Test-NetConnection HOST -Port 1762

UDP probe (no reply does not prove it is closed)

nc -vzu -w 5 HOST 1762

ufw

sudo ufw deny 1762/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 1762 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 1762 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 1762' -Direction Inbound -Protocol TCP -LocalPort 1762 -Action Block

ufw

sudo ufw deny 1762/udp

iptables

sudo iptables -A INPUT -p udp --dport 1762 -j DROP

nftables

sudo nft add rule inet filter input udp dport 1762 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block UDP 1762' -Direction Inbound -Protocol UDP -LocalPort 1762 -Action Block

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