Semrush - The Best Way to Analyze Your Link Network

This website provides a quick and easy way to analyze a website's link profile and determine its value. You can use it to identify potential issues with the link network, such as private blog networks (PBNs) or link schemes. Semrush analyzes the most significant links for the domain you enter into the search bar. The most niche-relevant sites will be marked green. The authority score of a website increases with the number of backlinks and the trustworthiness in the eyes of Google. Smaller dots indicate less authority. Highly relevant sites that are part of your niche are denoted by green dots, while those that are part of a manipulative link scheme are denoted by red dots. A cluster of red dots could be indicative of a private blog network. A spread-out web of green dots, on the other hand, is a sign of an overall healthy network. The Network Graph report makes it easy to find the best opportunities for link building by analyzing your competitor's site. Enter your competitor's site into the report and look for all the green dots. These sites are most relevant to your competitor's niche, and hopefully yours as well.

(source: https://www.semrush.com/blog/backlink-network-graph)