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// Other services

Port 4065: Avanti Common Data

Port 4065 is assigned by IANA to avanti_cdp (Avanti Common Data), avanti-cdp (Avanti Common Data IANA assigned this well-formed service name as a replacement for "avanti_cdp".).

4065

How avanti_cdp works

Other services
client:4065avanti_cdpresponse client:4065avanti_cdpresponse

The client sends a request to port 4065 and the avanti_cdp service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned2 registered services
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 4065 dangerous?

We have no specific security note for port 4065. 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 4065

ServicePortTransportDescriptionReferenceUpdated
avanti_cdp 4065 TCP, UDP Avanti Common Data - 2007-02
avanti-cdp 4065 TCP, UDP Avanti Common Data IANA assigned this well-formed service name as a replacement for "avanti_cdp". - 2007-02

// source: IANA service name and port number registry

03 Check it

Which program uses port 4065, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4065'      # process listening on 4065
sudo lsof -nP -i :4065

macOS

sudo lsof -nP -i :4065

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4065 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4065
netstat -ano | findstr :4065

From another machine

nmap -p 4065 -sV <host>
sudo nmap -sU -p 4065 <host>
nc -zv <host> 4065

Block it in the firewall

sudo ufw deny 4065/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4065" -Direction Inbound -LocalPort 4065 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4065 used for?

Port 4065 is assigned by IANA to avanti_cdp (Avanti Common Data), avanti-cdp (Avanti Common Data IANA assigned this well-formed service name as a replacement for "avanti_cdp".).

Is port 4065 TCP or UDP?

Port 4065 is registered for TCP and UDP.

Is it safe to open port 4065?

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 4065 is open?

On Linux run "ss -ltnup 'sport = :4065'", on macOS "lsof -nP -i :4065", and on Windows "netstat -ano | findstr :4065" to see the local process. From another machine, "nmap -p 4065 <host>" shows whether it is reachable.

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