What is SemrushBotBacklinks?

SemrushBotBacklinks is a bot in the SEO crawlers category, operated by Semrush.

Bot name
SemrushBotBacklinks
Operator
Semrush
Category
SEO Crawlers
Type
Bot
Respects robots.txt
Yes
robots.txt user agent
SemrushBot
Signs requests (Web Bot Auth)
No

About SemrushBotBacklinks

SemrushBotBacklinks is the Semrush bot collects data for Semrush's Backlink Analytics tool.

SEO crawlers map links, keywords and technical issues for SEO tools and backlink databases. They help the tool's customers, often your competitors, rather than you. Rate limit or block the ones you do not use.

SemrushBotBacklinks user agent

SemrushBotBacklinks identifies itself with this user agent string:

  • Mozilla/5.0 (compatible; SemrushBot/3~bl; +http://www.semrush.com/bot.html)

Anyone can copy a user agent string. Transfon Security also checks where each request comes from, so a request that claims to be a known crawler but comes from the wrong network is treated as a fake, not as the real crawler.

How to block SemrushBotBacklinks in robots.txt

SemrushBotBacklinks follows robots.txt, so these rules stop it crawling the paths you choose. robots.txt is a plain text file at the root of your domain, such as https://example.com/robots.txt.

Block SemrushBotBacklinks from the whole site

User-agent: SemrushBot
Disallow: /

Block SemrushBotBacklinks from some folders

User-agent: SemrushBot
Disallow: /private/
Disallow: /search

Allow SemrushBotBacklinks only on some folders

User-agent: SemrushBot
Allow: /blog/
Disallow: /

Allow SemrushBotBacklinks and block other crawlers

User-agent: SemrushBot
Allow: /

User-agent: *
Disallow: /

Things to know

  • Each host needs its own file. Rules on www.example.com do not apply to shop.example.com.
  • A crawler obeys only the most specific group that names it. Once you add a User-agent: SemrushBot group, SemrushBotBacklinks ignores your User-agent: * rules, so repeat any that should still apply.
  • The user agent name is not case sensitive. We take SemrushBot from SemrushBotBacklinks's user agent; check Semrush's own documentation if it publishes a different robots.txt name.
  • Crawlers cache robots.txt, so changes can take up to a day to apply. Disallow stops crawling but does not remove pages already collected or indexed.

Limits of robots.txt

  1. SemrushBotBacklinks may not follow the rule. SemrushBotBacklinks says it follows robots.txt, but nothing enforces that. Changes can take a day to apply, the operator can change its policy, and other crawlers from Semrush use different names and rules.
  2. The user agent could be fake. robots.txt matches the name a request claims. Anyone can send SemrushBotBacklinks's user agent, and a scraper using it is not bound by Semrush's robots.txt policy. Only checking the source network tells a real SemrushBotBacklinks from a fake one.

Treat robots.txt as a statement of your policy, and enforce it where requests arrive.

Who should care about SemrushBotBacklinks

Publishers

SemrushBotBacklinks works for an SEO tool's customers, often your competitors. It adds server load without readers, so rate limit or block it unless you use the tool.

Transfon Security for publishers

Media buyers and advertisers

SEO crawlers map landing pages and links for competitor research. Keep SemrushBotBacklinks's visits out of campaign data.

Transfon Security for advertisers

E-commerce

SemrushBotBacklinks can map your catalogue, prices and site structure for competitors. Block it unless you use the tool yourself.

Transfon Security for e-commerce

SaaS and APIs

Allow SemrushBotBacklinks only if your team uses the tool; otherwise rate limit it on docs and marketing pages.

Transfon Security for SaaS and APIs

Block SemrushBotBacklinks with Transfon Security

robots.txt is a request, not an enforcement. Transfon Security shows SemrushBotBacklinks by name in the Top Bots report, so you can see how often it visits and which pages it reads. Block or allow it with a User Agent rule, or slow it down with a rate limit decision rule.

Transfon Security

Control SemrushBotBacklinks on your site

  • See every SemrushBotBacklinks visit and the pages it reads
  • Spot bots that fake trusted crawler names
  • Block, allow or rate limit SemrushBotBacklinks with one rule
  • Works with or without robots.txt support

Frequently asked questions

What is SemrushBotBacklinks?

SemrushBotBacklinks is a bot in the SEO crawlers category, operated by Semrush. SemrushBotBacklinks is the Semrush bot collects data for Semrush's Backlink Analytics tool.

Does SemrushBotBacklinks respect robots.txt?

Yes. SemrushBotBacklinks follows robots.txt, so a Disallow rule for the SemrushBot user agent stops it from crawling the paths you list.

How do I block SemrushBotBacklinks?

Add "User-agent: SemrushBot" followed by "Disallow: /" to the robots.txt file at the root of your site. To enforce it, block requests whose user agent contains "SemrushBot/" at your WAF. In Transfon Security that is one User Agent block rule.

Is robots.txt enough to block SemrushBotBacklinks?

No. robots.txt is voluntary, so SemrushBotBacklinks may not follow it, and anyone can send SemrushBotBacklinks's user agent, so a fake SemrushBotBacklinks ignores your rule. Enforce the rule where requests arrive, at your WAF, and check the source network.

Should I block SemrushBotBacklinks?

SEO crawlers map links, keywords and technical issues for SEO tools and backlink databases. They help the tool's customers, often your competitors, rather than you. Rate limit or block the ones you do not use.

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