# twelvesec/gasmask

Information gathering tool - OSINT

Repository: https://github.com/twelvesec/gasmask
Canonical: https://ross.abutalabs.com/products/twelvesec-gasmask
Homepage: https://www.twelvesec.com/
Language: Python
License: GPL-3.0
License Family: copyleft
Topics: osint, reconnaissance, information-gathering
Last push: 2021-06-11T08:13:53+00:00

## Health v2 (maintenance only)
Score: 23/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 3165, "days_push": 1909, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1462, forks 179 (observed 2026-08-28T04:04:47.662307+00:00)

## What it is
GasMasK is an all-in-one open source OSINT and reconnaissance tool written in Python 3. It aggregates information about a target domain from many sources including search engines, DNS, whois, certificate transparency, Shodan, and Censys.

## Use cases
- gather osint on a domain
- enumerate subdomains and dns records
- find emails and employees via linkedin and google
- whois lookup for a domain
- query shodan and censys for exposed hosts
- reconnaissance before a pentest
- search certificate transparency logs for subdomains

## When to choose
- you want a single CLI that queries many OSINT sources for a domain
- you need quick passive reconnaissance during a security assessment
- you want results exported in multiple output formats

## When to avoid
- you need active scanning or exploitation rather than passive information gathering
- you need a maintained tool - the latest release dates to 2021 and some sources like Spyse or Google+ may be defunct
- you need a GUI or web interface

## Facets
- artifact type: cli-tool
- maturity: maintenance
- function: osint, web-scraping, search-engine, security
- domain: security, osint, penetration-testing
- platform: python, cli
- tags: reconnaissance, information-gathering, whois, dns-enum, shodan, censys, command-line, linux

## Member repositories
- twelvesec/gasmask (main) score 23

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:47.662307+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 2026-08-30T04:35:18.910590+00:00, confidence not recorded.
  - readme: https://github.com/twelvesec/gasmask (fetched 2026-08-28T04:04:47.662307+00:00, sha 806460e31e7d)
  - homepage: https://www.twelvesec.com/ (fetched 2026-08-29T11:43:56.788044+00:00, sha ee1923f73184)
- Data as of 2026-08-30T08:39:29.467469+00:00.