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// Other services

Port 4075: ISC Alarm Message Service

Port 4075 is assigned by IANA to perimlan (ISC Alarm Message Service).

4075

How perimlan works

Other services
client:4075perimlanresponse client:4075perimlanresponse

The client sends a request to port 4075 and the perimlan 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 4075 dangerous?

We have no specific security note for port 4075. 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 4075

ServicePortTransportDescriptionReferenceUpdated
perimlan 4075 TCP, UDP ISC Alarm Message Service - 2007-08-20

// source: IANA service name and port number registry

03 Check it

Which program uses port 4075, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4075'      # process listening on 4075
sudo lsof -nP -i :4075

macOS

sudo lsof -nP -i :4075

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4075 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4075
netstat -ano | findstr :4075

From another machine

nmap -p 4075 -sV <host>
sudo nmap -sU -p 4075 <host>
nc -zv <host> 4075

Block it in the firewall

sudo ufw deny 4075/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4075" -Direction Inbound -LocalPort 4075 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4075 used for?

Port 4075 is assigned by IANA to perimlan (ISC Alarm Message Service).

Is port 4075 TCP or UDP?

Port 4075 is registered for TCP and UDP.

Is it safe to open port 4075?

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 4075 is open?

On Linux run "ss -ltnup 'sport = :4075'", on macOS "lsof -nP -i :4075", and on Windows "netstat -ano | findstr :4075" to see the local process. From another machine, "nmap -p 4075 <host>" shows whether it is reachable.

05 Related
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