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// Other services

Port 4181: MacBak

Port 4181 is assigned by IANA to macbak (MacBak).

4181

How macbak works

Other services
client:4181macbakresponse client:4181macbakresponse

The client sends a request to port 4181 and the macbak 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 4181 dangerous?

We have no specific security note for port 4181. 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 4181

ServicePortTransportDescriptionReferenceUpdated
macbak 4181 TCP, UDP MacBak - 2007-04

// source: IANA service name and port number registry

03 Check it

Which program uses port 4181, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4181'      # process listening on 4181
sudo lsof -nP -i :4181

macOS

sudo lsof -nP -i :4181

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4181 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4181
netstat -ano | findstr :4181

From another machine

nmap -p 4181 -sV <host>
sudo nmap -sU -p 4181 <host>
nc -zv <host> 4181

Block it in the firewall

sudo ufw deny 4181/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4181" -Direction Inbound -LocalPort 4181 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4181 used for?

Port 4181 is assigned by IANA to macbak (MacBak).

Is port 4181 TCP or UDP?

Port 4181 is registered for TCP and UDP.

Is it safe to open port 4181?

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 4181 is open?

On Linux run "ss -ltnup 'sport = :4181'", on macOS "lsof -nP -i :4181", and on Windows "netstat -ano | findstr :4181" to see the local process. From another machine, "nmap -p 4181 <host>" shows whether it is reachable.

05 Related
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