# Oros42/IMSI-catcher

This program show you IMSI numbers of cellphones around you.

Repository: https://github.com/Oros42/IMSI-catcher
Canonical: https://ross.abutalabs.com/products/imsi-catcher
Language: Python
License: CC0-1.0
License Family: permissive
Topics: imsi-catcher, cellphones, frequency, gsm, gr-gsm, imsi-numbers, hackrf, osmocombb, rtl-sdr
Last push: 2026-06-06T13:47:14+00:00

## Health v2 (maintenance only)
Score: 71/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 86, release rhythm 35, longevity 100
- inputs: {"age_days": 4109, "days_push": 88, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 4515, forks 908 (observed 2026-08-28T04:08:52.691620+00:00)

## What it is
A Python tool that decodes GSM radio traffic captured via software-defined radio receivers (RTL-SDR, HackRF, BladeRF, OsmocomBB) to display IMSI numbers, country, brand, and operator of nearby cellphones. It is intended for educational purposes to understand how GSM networks work.

## Use cases
- detect IMSI catchers or stingrays in my area
- sniff IMSI numbers from nearby cellphones with an RTL-SDR dongle
- learn how GSM networks work hands-on
- monitor GSM traffic on a specific frequency with gr-gsm
- log observed IMSIs to SQLite or MySQL for analysis
- track a specific IMSI during a security research experiment

## When to choose
- you have an SDR receiver and a Linux PC and want to observe GSM signaling
- you are studying mobile network security or stingray detection
- you want a simple Python script to decode IMSI/TMSI from gr-gsm output

## When to avoid
- you need legal-compliant cellular monitoring or production telecom tooling
- you have no SDR hardware or Linux environment
- you expect support for 4G/5G networks - it only handles GSM
- you intend to use it for unauthorized surveillance

## Facets
- artifact type: application
- maturity: active
- function: security, networking, parser, data-science
- domain: security, networking, privacy, osint
- platform: python, cli
- tags: imsi-catcher, gsm, sdr, rtl-sdr, hackrf, gr-gsm, osmocombb, radio-monitoring, cellular-surveillance, security-research, telecommunications, linux

## Member repositories
- Oros42/IMSI-catcher (main) score 71

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:08:52.691620+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T18:20:19.274801+00:00, confidence not recorded.
  - readme: https://github.com/Oros42/IMSI-catcher (fetched 2026-08-28T04:08:52.691620+00:00, sha b8fe04d6c89a)
- Data as of 2026-08-30T08:39:29.467469+00:00.