IGハッシュタグ検索 - Instagramプラットフォーム - ドキュメンテーション - Facebook for Developers
Reading. Getting a Hashtag ID. GET /ig_hashtag_search?user_id={user-id}&q={ q}. Returns the ID of an IG Hashtag. IDs are both static and global (i.e, the ID for # bluebottle will always be 17843857450040591 for all apps and all app users).