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// Other services

Port 4046: Accounting Protocol

Port 4046 is assigned by IANA to acp-proto (Accounting Protocol).

4046

How acp-proto works

Other services
client:4046acp-protoresponse client:4046acp-protoresponse

The client sends a request to port 4046 and the acp-proto 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 4046 dangerous?

We have no specific security note for port 4046. 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 4046

ServicePortTransportDescriptionReferenceUpdated
acp-proto 4046 TCP, UDP Accounting Protocol - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 4046, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4046'      # process listening on 4046
sudo lsof -nP -i :4046

macOS

sudo lsof -nP -i :4046

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4046 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4046
netstat -ano | findstr :4046

From another machine

nmap -p 4046 -sV <host>
sudo nmap -sU -p 4046 <host>
nc -zv <host> 4046

Block it in the firewall

sudo ufw deny 4046/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4046" -Direction Inbound -LocalPort 4046 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4046 used for?

Port 4046 is assigned by IANA to acp-proto (Accounting Protocol).

Is port 4046 TCP or UDP?

Port 4046 is registered for TCP and UDP.

Is it safe to open port 4046?

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 4046 is open?

On Linux run "ss -ltnup 'sport = :4046'", on macOS "lsof -nP -i :4046", and on Windows "netstat -ano | findstr :4046" to see the local process. From another machine, "nmap -p 4046 <host>" shows whether it is reachable.

05 Related
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