# haccer/subjack

DNS Takeover tool written in Go

Repository: https://github.com/haccer/subjack
Canonical: https://ross.abutalabs.com/products/subjack
Language: Go
License: Apache-2.0
License Family: permissive
Topics: go, golang, hostile, subdomain, takeover, subdomain-takeover, bug-bounty, pentesting, infosec, bugbounty, security
Last push: 2026-07-03T16:34:48+00:00

## Health v2 (maintenance only)
Score: 87/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 90, release rhythm 75, longevity 100
- inputs: {"age_days": 3249, "days_push": 61, "days_rel": 170, "gap_med": 0, "n_releases_24m": 2}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2109, forks 349 (observed 2026-08-28T04:06:14.142418+00:00)

## What it is
Subjack is a DNS takeover scanner written in Go that concurrently scans lists of subdomains to identify ones vulnerable to hijacking. It detects dangling CNAMEs, NS delegations, stale A records, zone transfers, SPF/MX/SRV takeovers, and registrable NXDOMAINs.

## Use cases
- scan a list of subdomains for takeover vulnerabilities
- find dangling CNAME records pointing to unclaimed services
- check for expired nameserver and cloud DNS zone takeovers
- detect misconfigured zone transfers leaking DNS records
- identify SPF and MX records on expired domains for email spoofing
- mass-test domains during bug bounty reconnaissance

## When to choose
- you need fast, concurrent mass-scanning of subdomain lists for DNS takeovers
- you want broad coverage including NS, A record, AXFR, SPF, MX, and SRV takeover checks
- you are doing bug bounty or penetration testing reconnaissance in Go

## When to avoid
- you need a GUI or managed continuous monitoring service rather than a CLI scanner
- you require guaranteed accuracy without manual verification, since results can include false positives
- you need non-DNS web application vulnerability scanning

## Facets
- artifact type: cli-tool
- maturity: active
- function: security, networking, cli, developer-tools
- domain: security, penetration-testing, networking, developer-tools
- platform: windows, cli, go
- tags: subdomain-takeover, dns, bug-bounty, pentesting, dns-takeover, recon, linux, macos

## Member repositories
- haccer/subjack (main) score 87

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:06:14.142418+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 2026-08-30T02:53:50.968746+00:00, confidence not recorded.
  - readme: https://github.com/haccer/subjack (fetched 2026-08-28T04:06:14.142418+00:00, sha 1e57818a9e01)
- Data as of 2026-08-30T08:39:29.467469+00:00.