# UnaPibaGeek/ctfr

Abusing Certificate Transparency logs for getting HTTPS websites subdomains.

Repository: https://github.com/UnaPibaGeek/ctfr
Canonical: https://ross.abutalabs.com/products/ctfr
Language: Python
License: GPL-3.0
License Family: copyleft
Topics: certificate-transparency, certificate-transparency-logs, information-gathering, pentesting, hacking
Last push: 2024-01-02T17:19:37+00:00

## Health v2 (maintenance only)
Score: 32/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 35, longevity 100
- inputs: {"age_days": 3103, "days_push": 974, "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 2117, forks 294 (observed 2026-08-28T04:06:16.359011+00:00)

## What it is
CTFR is a Python command-line tool that enumerates HTTPS website subdomains by querying Certificate Transparency logs (via crt.sh) instead of brute-forcing or dictionary attacks. It takes a target domain and optionally writes discovered subdomains to an output file.

## Use cases
- enumerate subdomains of a target domain for a pentest
- discover HTTPS subdomains from certificate transparency logs
- gather attack surface information without brute-forcing DNS
- find subdomains for bug bounty reconnaissance
- save a list of subdomains to a text file
- replace legacy AXFR zone transfer techniques

## When to choose
- you need fast, passive subdomain discovery for HTTPS sites
- you want results without dictionary or brute-force DNS queries
- you need a lightweight Python script or Docker image for recon

## When to avoid
- you need active DNS resolution or validation of discovered hosts
- you need broad OSINT beyond subdomain enumeration
- you require frequent updates or active maintenance

## Facets
- artifact type: cli-tool
- maturity: maintenance
- function: security, osint, web-scraping, cli
- domain: security, penetration-testing, osint, networking
- platform: python, cli, cross-platform
- tags: subdomain-enumeration, certificate-transparency, reconnaissance, pentesting, crtsh

## Member repositories
- UnaPibaGeek/ctfr (main) score 32

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:06:16.359011+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 2026-08-30T02:53:07.589709+00:00, confidence not recorded.
  - readme: https://github.com/UnaPibaGeek/ctfr (fetched 2026-08-28T04:06:16.359011+00:00, sha 3a5fe7ee7f6b)
- Data as of 2026-08-30T08:39:29.467469+00:00.