What is CoostiBot?

CoostiBot is a bot in the content aggregators category, operated by Coosti ApS.

Bot name
CoostiBot
Operator
Coosti ApS
Type
Bot
Respects robots.txt
Yes
robots.txt user agent
CoostiBot
Signs requests (Web Bot Auth)
No

About CoostiBot

CoostiBot crawls merchant websites for Coosti.dk, a Danish price comparison platform. Respects robots.txt

Aggregators collect articles and links from many sites to build news feeds, read later apps and discovery services. Some send referral traffic, others republish your content. Check what each one does with your pages before allowing it.

CoostiBot user agent

CoostiBot identifies itself with this user agent string:

  • Mozilla/5.0 (compatible; CoostiBot/1.0; +https://coosti.dk/bot-info)

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 CoostiBot in robots.txt

CoostiBot 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 CoostiBot from the whole site

User-agent: CoostiBot
Disallow: /

Block CoostiBot from some folders

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

Allow CoostiBot only on some folders

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

Allow CoostiBot and block other crawlers

User-agent: CoostiBot
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: CoostiBot group, CoostiBot ignores your User-agent: * rules, so repeat any that should still apply.
  • The user agent name is not case sensitive. We take CoostiBot from CoostiBot's user agent; check Coosti ApS'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. CoostiBot may not follow the rule. CoostiBot 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 Coosti ApS use different names and rules.
  2. The user agent could be fake. robots.txt matches the name a request claims. Anyone can send CoostiBot's user agent, and a scraper using it is not bound by Coosti ApS's robots.txt policy. Only checking the source network tells a real CoostiBot from a fake one.

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

Who should care about CoostiBot

Publishers

CoostiBot fetches pages when your links are shared or syndicated. Keep it allowed so previews and feeds work, but leave it out of page views and ad requests.

Transfon Security for publishers

Media buyers and advertisers

When ads or posts are shared, CoostiBot fetches the landing page. Those hits are not clicks, so keep them out of campaign reports.

Transfon Security for advertisers

E-commerce

Product links shared in chats and feeds are fetched by CoostiBot. Keep it allowed so previews show the right image and price.

Transfon Security for e-commerce

SaaS and APIs

Allow CoostiBot on public pages so shared links preview well, and keep it off the app.

Transfon Security for SaaS and APIs

Block CoostiBot with Transfon Security

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

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

Frequently asked questions

What is CoostiBot?

CoostiBot is a bot in the content aggregators category, operated by Coosti ApS. CoostiBot crawls merchant websites for Coosti.dk, a Danish price comparison platform. Respects robots.txt

Does CoostiBot respect robots.txt?

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

How do I block CoostiBot?

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

Is robots.txt enough to block CoostiBot?

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

Should I block CoostiBot?

Aggregators collect articles and links from many sites to build news feeds, read later apps and discovery services. Some send referral traffic, others republish your content. Check what each one does with your pages before allowing it.

Related bots

All content aggregators · Full bot directory

See Which Bots Visit Your Site

Transfon Security identifies every bot in this directory in your traffic reports, flags fake search crawlers, and lets you allow, block or rate limit each bot.

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