# MJ12bot

> Majestic's link-graph crawler, run as a distributed community project. Majestic states plainly that it cannot restrict the bot to a fixed set of addresses, and offers a pre-arranged ident string in the request headers instead.

| field | value |
|---|---|
| operator | Majestic |
| category | SEO and backlink crawlers |
| robots.txt token | `MJ12bot` |
| user-agent contains | `MJ12bot` |
| robots.txt | obeys robots.txt (documented) |
| verify by | no published verification method |
| published IP ranges | none published |
| prefixes mirrored | 0 IPv4 / 0 IPv6 |
| operator docs | https://mj12bot.com/ |
| last reviewed | 2026-09-01 |

## What blocking it costs you

You leave the Majestic backlink index. No search or AI effect. It supports Crawl-delay, which is usually the better answer than a block.

## Full user-agent string

```
Mozilla/5.0 (compatible; MJ12bot/v1.4.8; http://mj12bot.com/)
```

## Block it

```
User-agent: MJ12bot
Disallow: /
```

## Allow it

```
User-agent: MJ12bot
Allow: /
```

JSON: https://www.pathwren.workers.dev/crawler/mj12bot.json · index: https://www.pathwren.workers.dev/llms.txt