Instead of searching for a crack, it is better to understand what ntopng is, why the Community version is often enough, and the legal ways to access Professional or Enterprise features. What is ntopng?
Searching for or installing a "cracked" version of network monitoring software is particularly dangerous because:
Before looking for a crack, consider that the ntopng Community Edition is completely free and open-source. It includes powerful features suitable for most home users and small labs: Real-time traffic visualization. Support for protocols like NetFlow, sFlow, and IPFIX. Historical data storage (via ClickHouse or SQLite). Alerting systems for network anomalies. How to Get Premium Features Legally
If you need advanced features like SNMP polling, historical traffic reporting, or Active Directory integration, there are better paths than risk-prone cracks: