MJ12bot

Listed only

The crawler behind Majestic's backlink index. Majestic explicitly states it is a community-based distributed crawler with no fixed IP allocation, so requests cannot be verified by IP, ASN, or reverse DNS.

Operated by Majestic-12 · Official documentation

User agents

Patterns this directory matches, with real observed strings.

regexMJ12bot/v\d
observedMozilla/5.0 (compatible; MJ12bot/v1.4.8; http://mj12bot.com/)

How to verify

No verification recipe published by the operator.

Good Bot Practices scorecard

Identifies honestly
Stable UA token documented (1 pattern)
Verifiable
Operator publishes no verification path
Respects robots.txt
Honors robots.txt (token: MJ12bot)
Behaves
Crawl-rate behavior is operator-declared; not machine-verifiable from this dataset
Reachable operator
Operator and documentation published

Measured against the Good Bot Practices.