IMSI Lookup & Decoder

Need to lookup thousands of IMSIs offline in seconds?

Get the IMSI Lookup CLI (Windows) — bulk CSV processing, no internet required.

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Need Bulk IMSI Lookup?

The free web tool is perfect for single IMSIs. For professional telecom work, use the offline CLI version.

  • Process thousands of IMSIs from CSV
  • Works fully offline (secure environments)
  • Outputs enriched CSV or JSON
  • Shows carrier & country statistics
  • Runs on Windows in one command
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How Our IMSI Lookup Works

Our IMSI Lookup & Decoder tool analyzes a 15-digit International Mobile Subscriber Identity (IMSI) number to provide key details. When you enter an IMSI, our tool extracts the Mobile Country Code (MCC), Mobile Network Code (MNC), and the Mobile Subscriber Identification Number (MSIN). Using this information, we identify the mobile carrier, country of origin, and the types of networks it can connect to (like GSM, LTE, or 5G).

What is an IMSI?

The International Mobile Subscriber Identity (IMSI) is a unique identifier for a mobile subscriber on any cellular network. This number, typically 15 digits long, is stored on the SIM card and is essential for routing calls, messages, and data. It consists of three parts: the MCC (identifies the country), the MNC (identifies the mobile operator), and the MSIN (identifies the subscriber).

Do you offer a bulk IMSI lookup tool?

Yes. We provide a professional offline Windows CLI that can process thousands of IMSIs from CSV files with carrier, country, MCC, and MNC enrichment. You can download it here:IMSI Lookup CLI

Frequently Asked Questions

Why use an IMSI Lookup Tool?

An IMSI lookup tool is invaluable for anyone in the telecommunications field, including network engineers, developers, and security analysts. It helps in quickly identifying a SIM card's home network and country, which is useful for troubleshooting, network analysis, and verifying mobile identity.

Is this IMSI lookup service free?

Yes, our IMSI Lookup tool is completely free to use.

Is my IMSI number kept private?

Absolutely. We prioritize your privacy. The IMSI you enter is used only for the lookup and is not stored or logged on our systems.