A quick Google search for "PRTG network monitor license key" or "PRTG keygen" reveals dozens of shady websites claiming to offer free, unlimited keys. Some even provide a "license key generator" (keygen) executable. Do not fall for this trap.
Here is why using a pirated PRTG license key is a terrible idea:
PRTG is commercial software. Using a cracked license key violates Paessler’s terms and copyright law. If you are a business, you face fines, audits, and potential lawsuits. Paessler has sued companies for using pirated licenses in production. prtg network monitor license key
Paid licenses are tied to a specific number of sensors. As of 2025, common tiers include:
Each license includes:
Paessler actively monitors for license key abuse. Commercial licenses may call home periodically. If an invalid key is detected, Paessler can:
PRTG Network Monitor requires a license key to unlock its full feature set and scale monitoring beyond the free limits. This post explains the license types, how keys work, how to obtain and activate a key, common troubleshooting steps, and best practices for license management. A quick Google search for "PRTG network monitor
A: No. Each PRTG core server installation requires its own license key. However, one license covers unlimited remote probes (sensors running on other machines that report back to one core).
A PRTG license key is an alphanumeric code that activates your installation of PRTG. It tells the software which edition you are running (Freeware or Commercial) and how many sensors you are licensed to use. how keys work
Note: In PRTG terminology, a “sensor” is not a physical device. A sensor is a monitoring unit that checks one specific metric—for example, one sensor for ping, another for HTTP traffic, another for SMTP response time, etc. One server or switch might require 10–20 sensors.
Without a valid license key, PRTG will either run in a limited trial mode or the Freeware Edition, which is capped at 100 sensors forever.