.NET (from “network”) is one of the original top-level domains introduced in 1985, and has remained a popular extension throughout its history. Like .COM, there are no restrictions on .NET registrations. As of 2009, it is the fourth most popular domain. The .NET extension is operated by VeriSign.
Why register .NET?
In addition to being an ideal extension for SaaS, network infrastructure, communications, and eCommerce companies, .NET domains act as a valuable complement or alternative to existing .COMs.