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MMSI validator

Checksum-free format validation for 9-digit maritime identifiers.

Client
Valid MMSI format: 366123456 (MID 366)

Nearby workflows on Toolcore

  • IMO number checker — Seven-digit IMO ship ID—weighted mod-10 check digit; optional IMO prefix; no registry lookup; browser-only. when another identifier column uses a different checksum ruleset.
  • GTIN checksum (EAN / UPC) — Paste GTIN‑8, UPC‑A (GTIN‑12), EAN‑13, or logistic GTIN‑14 digits—ISO GS1 modulus‑10 parity without GS1 lookup—browser-only. when another identifier column uses a different checksum ruleset.
  • IMEI & IMEISV checker — 15-digit GSM IMEI: TAC/SNR split and Luhn verification; 14-digit check hint or 16-digit IMEISV segmentation—no carrier lookup; browser-only. when another identifier column uses a different checksum ruleset.
  • UUID validator — Validate UUID and GUID strings: version, RFC 4122 variant, bulk paste—browser-only, no upload. when another identifier column uses a different checksum ruleset.

Common use cases

  • MMSI validator for quick local checks without uploading data.
  • Copy results into tickets, docs, or classroom notes.

Common mistakes to avoid

  • Unexpected input shape

    See the intro and how-to notes for accepted formats.

FAQ

Is processing local?

Yes—this runs entirely in your browser.

Agent prefill?

Use q or qb for the main text field when supported.

More tools

Related utilities you can open in another tab—mostly client-side.