Telescan
What is this for?
Search users in groups (and in which groups is the user) by id, username or phone number (if it's in your contacts).
What do I need?
To use this tool you need Telegram API creds. After you registered a new app, edit api_creds.ini
file accordingly.
Usage
You need to install the requirements first.
python3 telescan.py api_creds.ini
Limitations
To know if a user is in a group, you have to be in that group too. You can't know which users are in a specific channel if you are not an administrator.
Credits
© Pielco11