Review on NMAP Online by Christopher Gonzalez

I like that it's free to try out! It is easy enough for beginners but has advanced options if you know what they are looking at. The interface could be more intuitive and easier to navigate with fewer pop-ups everywhere. Also not having any way of exporting results into other software makes this harder than necessary sometimes. Try using their trial version first so you don't have to pay or worry about losing access when trying something new. If you're just getting started in network security then start here - there really isn't anything else similar available right now unless you want an expensive tool (or need licensing). Trying to understand how different protocols work within networks and where vulnerabilities exist before attacks occur.