Is This FC Possible? v1.1

Enter a Mario Kart Wii friend code (12 digits, with or without dashes). This page checks two things:

Checksum-valid for MKW and PID < 1,000,000,000.
Whether that PID is seen on the RWFC VR leaderboard.

Tip: Press Enter to check.

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Implementation notes: FC validity uses the MKW algorithm (MD5 over LE(PID) + "JCMR", then (md5[0] >> 1) matches the 7-bit checksum). PID is the lower 32 bits of the 39‑bit FC. RWFC lookup calls https://rwfc.net/api/leaderboard/player/FRIENDCODE. The leaderboard API is not the single source of truth, please use the official pinfo API or the /pinfo command on the Retro WFC bot for PID checking. Made by ChatGPT 5 Thinking.