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// Other services

Port 1767: cft-6

Port 1767 is assigned by IANA to cft-6 (cft-6).

1767

How cft-6 works

Other services
client:1767cft-6response client:1767cft-6response

The client sends a request to port 1767 and the cft-6 service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 1767 dangerous?

We have no specific security note for port 1767. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 1767

ServicePortTransportDescriptionReferenceUpdated
cft-6 1767 TCP, UDP cft-6 - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1767, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1767'      # process listening on 1767
sudo lsof -nP -i :1767

macOS

sudo lsof -nP -i :1767

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1767 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1767
netstat -ano | findstr :1767

From another machine

nmap -p 1767 -sV <host>
sudo nmap -sU -p 1767 <host>
nc -zv <host> 1767

Block it in the firewall

sudo ufw deny 1767/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1767" -Direction Inbound -LocalPort 1767 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1767 used for?

Port 1767 is assigned by IANA to cft-6 (cft-6).

Is port 1767 TCP or UDP?

Port 1767 is registered for TCP and UDP.

Is it safe to open port 1767?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 1767 is open?

On Linux run "ss -ltnup 'sport = :1767'", on macOS "lsof -nP -i :1767", and on Windows "netstat -ano | findstr :1767" to see the local process. From another machine, "nmap -p 1767 <host>" shows whether it is reachable.

05 Related
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