IMSI format check

Client

Format-only check—pairs with ICCID and IMEI validators.

About IMSI format check

Validate International Mobile Subscriber Identity length and digit shape. The interactive transform on this page runs in your browser tab—Toolcore does not need your paste for the core operation described above.

How to use this page

Paste or type in the main workspace, run the primary action from the toolbar, then copy or download the result. Use Load example when the page offers it, or URL prefill (?q= / ?qb=) so agents and tickets open the same input.

Valid IMSI shape: MCC 310, MNC 150, MSIN 123456789 (15 digits)

Nearby workflows on Toolcore

  • ICCID checker (SIM) — 18–22 digit ICCID: telecom MII hint (89), E. 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.
  • MEID checker (CDMA) — 14–15 hex or 18–19 decimal Mobile Equipment Identifier—Luhn mod‑10/16 check digit; RR/manufacturer/serial split—no TIA lookup; browser-only. when another identifier column uses a different checksum ruleset.
  • E.164 phone normalize — Strip formatting, normalize + / 00 / 011, validate ITU-style length; NANP +1 hint for 10-digit US/CA style—local only. when another identifier column uses a different checksum ruleset.

Common use cases

  • IMSI format check 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.