Before discussing cracks, you need to understand what ntopng provides for free and what requires payment.

The exploration of any software's vulnerabilities should always be conducted within a legal and ethical framework. This includes:

Cracked software is a top vector for malware. When you download an “ntopng crack” from torrent sites or forums, you often get:

Since ntopng often runs with high privileges (root/administrator) to capture packets, a cracked version can compromise your entire network.