CyberHunter
Local dataset, no network
// Other services

Port 4345: Macro 4 Network AS

Port 4345 is assigned by IANA to m4-network-as (Macro 4 Network AS).

4345

How m4-network-as works

Other services
client:4345m4-network-asresponse client:4345m4-network-asresponse

The client sends a request to port 4345 and the m4-network-as 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 4345 dangerous?

We have no specific security note for port 4345. 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 4345

ServicePortTransportDescriptionReferenceUpdated
m4-network-as 4345 TCP, UDP Macro 4 Network AS - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 4345, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4345'      # process listening on 4345
sudo lsof -nP -i :4345

macOS

sudo lsof -nP -i :4345

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4345 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4345
netstat -ano | findstr :4345

From another machine

nmap -p 4345 -sV <host>
sudo nmap -sU -p 4345 <host>
nc -zv <host> 4345

Block it in the firewall

sudo ufw deny 4345/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4345" -Direction Inbound -LocalPort 4345 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4345 used for?

Port 4345 is assigned by IANA to m4-network-as (Macro 4 Network AS).

Is port 4345 TCP or UDP?

Port 4345 is registered for TCP and UDP.

Is it safe to open port 4345?

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 4345 is open?

On Linux run "ss -ltnup 'sport = :4345'", on macOS "lsof -nP -i :4345", and on Windows "netstat -ano | findstr :4345" to see the local process. From another machine, "nmap -p 4345 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

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