You need backlinks to improve your search engine ranking. But that's not all. You need backlinks from different domains based on different IPs. This is more valuable for your ranking.

Use Backlink Check to analyse your domain- and IP popularity (analyse your own homepage URLs), find new link partners (analyse competitors hompeage URLs), find link exchange networks (analyse suspicious homepage URLs). Knowing who is linking to you and what link text they're using is one of the most important aspects in Search Engine Optimization. This tool checks your backlinks shows their description, language and size.