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Port 1767 (cft-6)

IANA assigns port 1767 to cft-6.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
cft-6 TCP cft-6 Martine Marchand -
cft-6 UDP cft-6 Martine Marchand -

Check what is listening on port 1767

Linux: is anything listening on TCP 1767?
sudo ss -tlnp 'sport = :1767'
Linux: UDP 1767
sudo ss -ulnp 'sport = :1767'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1767
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1767 '
Windows (Command Prompt)
netstat -ano | findstr :1767
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1767 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1767
From Windows
Test-NetConnection HOST -Port 1767
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1767

Block port 1767 in the firewall

ufw
sudo ufw deny 1767/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1767 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1767 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1767' -Direction Inbound -Protocol TCP -LocalPort 1767 -Action Block
ufw
sudo ufw deny 1767/udp
iptables
sudo iptables -A INPUT -p udp --dport 1767 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1767 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1767' -Direction Inbound -Protocol UDP -LocalPort 1767 -Action Block

Related ports

1765cft-41766cft-51768cft-71769bmc-net-adm

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