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 you need a Telegram API, then edit api_id and api_hash with the ones that you previously generated.
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
