Sublist3r ¶

Sublist3r (9.2k ⭐, 2020 🪦) is a Python tool to passively or actively (using -b and -t) look for subdomains.

$ sudo apt install -y sublist3r
$ sublist3r -d example.com -t 3 -e bing

It seems the tool doesn't work anymore as of 2024.