How to Block Ahrefs Moz and Majestic 2026

Have you ever wondered if your competitors are using Ahrefs, Moz, or Majestic to look at your website's backlinks and SEO strategies? Well, they probably are. And here's the thing, these tools make it very easy for anyone to spy on your hard work.

The good news is that you can stop them. By blocking these SEO bots from crawling your website, you keep your strategies private, save server resources, and maintain a real competitive edge.

In this guide, we'll show you exactly how to block AhrefsBot, Mozbot, and MJ12bot (Majestic) using simple, step-by-step methods, from beginner-friendly options like robots.txt to more powerful solutions like Cloudflare and server firewalls.

What Are SEO Bots and Why Do They Visit Your Site?

SEO bots crawl your site to collect backlink and ranking data for third-party tools.

SEO bots are basically automated robots that visit websites, read the content, and collect data. This data is then used by SEO platforms to show metrics like backlink counts, domain authority, and keyword rankings.

Think of them like secret shoppers, they visit your store, take notes on everything, and report back to their employers (in this case, your competitors who pay for these tools).

The Three Main SEO Bots You Should Know

• AhrefsBot  The bot behind Ahrefs.com. It's known for having one of the largest backlink indexes in the world and crawls billions of pages every day.
• Mozbot / rogerbot  The bot used by Moz. It powers the Domain Authority (DA) metric and Moz's Link Explorer tool.
• MJ12bot  The bot used by Majestic. It specializes in collecting Trust Flow and Citation Flow data from your backlinks.

All three bots identify themselves using a special string called a user-agent. This is like a name tag they wear when visiting your site. By targeting these user-agent strings, we can tell servers to turn these bots away.

Why Should You Block These Bots?

Not everyone needs to block these tools, but in many cases, it's a smart move. Here are the main reasons website owners choose to do it:

1. Keep Your Backlink Strategy Private

Every backlink your site has earned is visible in tools like Ahrefs and Majestic — unless you block their bots. Competitors can easily see which sites are linking to you, find your best link sources, and try to get the same links for themselves.

2. Protect Your Private Blog Network (PBN)

If you run a Private Blog Network (PBN), blocking these bots is absolutely critical. SEO crawlers can expose your entire network of sites, which can lead to spam reports, manual penalties, and de-indexation from Google.

3. Save Server Resources

These bots make thousands of requests to your server every month. They don't bring you any traffic or rankings, they just consume your bandwidth. Blocking them keeps your server running smoothly and saves you hosting costs.

4. Get Cleaner Analytics Data

Bot traffic can mess up your Google Analytics reports. When you block these crawlers, you get cleaner data that only reflects real human visitors.

Should You Block? Pros vs. Cons

Here's a quick comparison to help you decide:

Blocking Methods at a Glance

There are several ways to block these SEO bots. Here's a quick overview before we dive into each one:

Method 1: Using robots.txt (Easiest Way to Start)

The robots.txt file sits in your website's root folder and tells bots what they can and cannot access. All three major SEO tools respect this file by default.

To block all three bots, add the following lines to your robots.txt file:

User-agent: AhrefsBot

Disallow: /

User-agent: MJ12bot

Disallow: /

User-agent: Mozbot

Disallow: /

User-agent: rogerbot

Disallow: /

User-agent: dotbot

Disallow: /

Limitation: robots.txt is a polite request, not a hard rule. Legitimate tools like Ahrefs and Moz will follow it, but shady scrapers can ignore it. For stronger protection, combine this with server-level blocking below.

Method 2: Blocking via Apache .htaccess

If your website is hosted on an Apache server (which is common for most shared hosting), you can block bots directly in your .htaccess file. This is a much stronger method since bots cannot bypass it, your server will simply return a 403 Forbidden error.

Add this code to your .htaccess file:

RewriteEngine On

RewriteCond %{HTTP_USER_AGENT} AhrefsBot [NC,OR]

RewriteCond %{HTTP_USER_AGENT} MJ12bot [NC,OR]

RewriteCond %{HTTP_USER_AGENT} Mozbot [NC,OR]

RewriteCond %{HTTP_USER_AGENT} rogerbot [NC,OR]

RewriteCond %{HTTP_USER_AGENT} dotbot [NC]

RewriteRule .*, [F,L]

Method 3: Blocking via Nginx Server

If your website runs on Nginx, you can add a simple rule to your Nginx configuration file to return a 403 error for these bots.

if ($http_user_agent ~* "AhrefsBot|MJ12bot|Mozbot|rogerbot|dotbot") {

    return 403;

}

After adding this, restart Nginx with the command: sudo systemctl restart nginx

Method 4: Using Cloudflare WAF (Recommended for Most People)

If you use Cloudflare (which is free and highly recommended), their Web Application Firewall (WAF) gives you powerful control over who can access your site.

Step-by-Step Instructions

1. Log in to your Cloudflare dashboard
2. Go to Security → WAF → Firewall Rules
3. Click "Create Firewall Rule"
4. Set the rule: Field = User Agent / Operator = contains / Value = AhrefsBot
5. Set Action = Block
6. Add more conditions for Mozbot and MJ12bot using the OR operator
7. Save and deploy

You can also write the expression directly: 

(http.user_agent contains "AhrefsBot") or

(http.user_agent contains "MJ12bot") or

(http.user_agent contains "Mozbot")

Cloudflare also lets you block by IP address ranges, which is even harder for bots to bypass. You can find Ahrefs' official crawler IP list in their public documentation.

Method 5: IP-Level Blocking with iptables (Advanced)

For maximum protection, you can block the actual IP addresses used by these crawlers at the server network level using iptables on Linux servers.

# Block an Ahrefs IP range (example)

iptables,A INPUT,s 54.36.148.0/24,j DROP

iptables,A INPUT,s 54.36.149.0/24,j DROP

Note: IP ranges change regularly. You need to update this list at least once a month. You can find the latest IP ranges in the Ahrefs crawler documentation and Majestic's MJ12bot documentation.

The Best Strategy: Use Multiple Layers Together

Using just one method is like locking only one door in a house with ten doors. For the best protection, combine all the methods into a layered defense:

• Layer 1 — robots.txt: Politely ask bots to leave (they usually listen)
• Layer 2 — .htaccess or Nginx: Block by user-agent at the server level
• Layer 3 — Cloudflare WAF: Block by user-agent AND behavioral analysis
• Layer 4 — IP Firewall: Block at the network level, the hardest layer to bypass

How to Check If the Blocking Is Working

After setting up your blocks, you'll want to make sure they're actually working. Here's how:

Check Your Server Logs

Look for 403 errors in your logs with the bot's user-agent name:

grep "403" /var/log/apache2/access.log | grep,i "ahrefsbot"

Use Cloudflare Analytics

If you're using Cloudflare, go to Security → Overview. You'll see a list of all blocked requests, including which bots were stopped.

Search Ahrefs.com

Wait 2–4 weeks after blocking, then search your domain on ahrefs.com. If the data stops updating (the last crawl date becomes older and older), your block is working.

Frequently Asked Questions

Will blocking these bots hurt my Google rankings?

No. Google uses its own crawler (Googlebot), which is completely separate. Blocking Ahrefs, Moz, or Majestic has zero impact on your Google search rankings.

Can these bots bypass my robots.txt?

Legitimate versions of these bots follow robots.txt voluntarily. However, if someone builds a scraper using the same user-agent string, they could technically ignore your robots.txt. That's why server-level blocking is more reliable.

Is it legal to block SEO bots?

Yes, completely. You have full legal control over who can access your website. Blocking any bot — including SEO crawlers — is entirely within your rights.

How often should I update my IP blocklists?

At least once a month. These companies occasionally change their IP ranges. You can automate this using a shell script that downloads the latest IP list from their documentation pages.

Can I allow Googlebot but block everything else?

Yes! Simply add Googlebot and Bingbot to your robots.txt as allowed, and then block all others at the server level. This way you stay indexed in Google while hiding your data from competitors.

Final Thoughts

Blocking Ahrefs, Moz, and Majestic is a smart, simple, and legal way to protect your SEO work from competitors. Whether you're running a private blog network, a niche website, or a competitive business, keeping your backlink data private gives you a real edge.

Start with the robots.txt method today, then add .htaccess or Nginx blocking for extra protection. If you want maximum security, add Cloudflare WAF on top of that.

Remember: Google doesn't care if you block these tools. Your search rankings will not be affected. The only thing that changes is who can see your data, and that's exactly what you want to control.

© 2026 - SEO Security Guide | For Educational Purposes