What is this?

This knowledgebase contains questions and answers about PRTG Network Monitor and network monitoring in general.

Learn more

PRTG Network Monitor

Intuitive to Use. Easy to manage.
More than 500,000 users rely on Paessler PRTG every day. Find out how you can reduce cost, increase QoS and ease planning, as well.

Free Download

Top Tags

View all Tags

Sensor for external DNS resolution



I was wondering if there was a Sensor or a script, I could use to test if a FQDn resolves to a specific IP over an External defined DNS, so if it doesn't resolve to that IP anymore it's gonna give me a warning.


FQDN: pbx.example.com DNS: (Google DNS) IP: normal PBX)

If the IP would change to 456.456.456.456(example failover PBX) a warning would get triggered.

The reason it has to be an external DNS Server is, our internal DNS Server would always resolve it to our normal PBX and would never change to be the failover one.

Thanks for any ideas or answers in advance

dns dns-resolution external prtg resolution resolver

Created on Apr 28, 2021 2:48:17 PM

1 Reply



Hello, we currently don't have a sensor that could do this. But if you are able to create a script for this, you can run it on a Exe/Script sensor so PRTG can execute that script on the probe machine and alert based on the returned values. But we do not create custom scripts as those include very specific information of your system.

Created on Apr 30, 2021 7:48:20 PM by  Jonathan Mena [Paessler Technical Support]

Disclaimer: The information in the Paessler Knowledge Base comes without warranty of any kind. Use at your own risk. Before applying any instructions please exercise proper system administrator housekeeping. You must make sure that a proper backup of all your data is available.