https://github.com/bellingcat/telegram-phone-number-checker
To find these search engines, google for “telegram search engine”, optionally with specific domain like “github.com”, “reddit.com”, “medium.com”.
Available search engines:
https://cse.google.com/cse?q=+&cx=006368593537057042503:efxu7xprihg (Telegago)
https://intelx.io/tools?tab=telegram
https://telemetr.me/all_posts/
https://cse.google.com/cse?cx=006368593537057042503%3Aig4r3rz35qi#gsc.tab=0 (Commentogram)
https://www.telegram-groups.com/
Available telegram search engine bots:
Telegram related resources:
https://taiha.dev/technology/telegram-search-engines/
https://github.com/ItIsMeCall911/Awesome-Telegram-OSINT
https://medium.com/@ibederov_en/telegram-search-engines-fc8d9c1cc1a6
You can directly use Google as telegram search engine, like indexed part of Telegram itself site:t.me, and on external aggregators, for example site:tgstat.ru or site:telemetr.me