Cost / License
- Free
- Open Source
Platforms
- Linux
Fierce is described as 'Semi-lightweight scanner that helps locate non-contiguous IP space and hostnames against specified domains' and is an app. There are three alternatives to Fierce for Linux, Python, Mac and Windows. The best Fierce alternative is DNS recon, which is both free and Open Source. Other great apps like Fierce are SubBrute and Knockpy.