What is SemrushBotBacklinkAudit?

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

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

About SemrushBotBacklinkAudit

Data collected by SEMrushBot is used for the Backlink Audit tool to check website backlinks

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.

SemrushBotBacklinkAudit user agent

SemrushBotBacklinkAudit identifies itself with this user agent string:

  • Mozilla/5.0 (compatible; SemrushBot-BA; +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 SemrushBotBacklinkAudit in robots.txt

SemrushBotBacklinkAudit 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 SemrushBotBacklinkAudit from the whole site

User-agent: SemrushBot-BA
Disallow: /

Block SemrushBotBacklinkAudit from some folders

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

Allow SemrushBotBacklinkAudit only on some folders

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

Allow SemrushBotBacklinkAudit and block other crawlers

User-agent: SemrushBot-BA
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-BA group, SemrushBotBacklinkAudit ignores your User-agent: * rules, so repeat any that should still apply.
  • The user agent name is not case sensitive. We take SemrushBot-BA from SemrushBotBacklinkAudit'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. SemrushBotBacklinkAudit may not follow the rule. SemrushBotBacklinkAudit 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 SemrushBotBacklinkAudit'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 SemrushBotBacklinkAudit from a fake one.

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

Who should care about SemrushBotBacklinkAudit

Publishers

SemrushBotBacklinkAudit 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 SemrushBotBacklinkAudit's visits out of campaign data.

Transfon Security for advertisers

E-commerce

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

Transfon Security for SaaS and APIs

Block SemrushBotBacklinkAudit with Transfon Security

robots.txt is a request, not an enforcement. Transfon Security shows SemrushBotBacklinkAudit 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 SemrushBotBacklinkAudit on your site

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

Frequently asked questions

What is SemrushBotBacklinkAudit?

SemrushBotBacklinkAudit is a bot in the SEO crawlers category, operated by Semrush. Data collected by SEMrushBot is used for the Backlink Audit tool to check website backlinks

Does SemrushBotBacklinkAudit respect robots.txt?

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

How do I block SemrushBotBacklinkAudit?

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

Is robots.txt enough to block SemrushBotBacklinkAudit?

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

Should I block SemrushBotBacklinkAudit?

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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