Search Engine crawling can be disabled by robots.txt file changes.
Search engine User-agents
Common search engine User-agents are
Googlebot Yahoo! Slurp bingbot
Common search engine User-agents blocked:
AhrefsBot Baiduspider Ezooms MJ12bot YandexBot
Set a crawl delay for all search engines:
If you had 1,000 pages on your website, a search engine could potentially index your entire site in a few minutes.
However, this could cause high system resource usage with all of those pages loaded in a short time period.
A Crawl-delay: of 30 seconds would allow crawlers to index your entire 1,000 page website in just 8.3 hours
A Crawl-delay: of 500 seconds would allow crawlers to index your entire 1,000 page website in 5.8 days
You can set the Crawl-delay: for all search engines at once with:
User-agent: * Crawl-delay: 30
Allow all search engines to crawl website:
By default search engines should be able to crawl your website, but you can also specify they are allowed with:
User-agent: * Disallow:
Disallow all search engines from crawling website:
You can disallow any search engine from crawling your website, with these rules:
User-agent: * Disallow: /
Disallow one particular search engines from crawling website:
You can disallow just one specific search engine from crawling your website, with these rules:
User-agent: Baiduspider Disallow: /
Disallow all search engines from particular folders:
If we had a few directories like /cgi-bin/, /private/, and /tmp/ we didn’t want bots to crawl we could use this:
User-agent: * Disallow: /cgi-bin/ Disallow: /private/ Disallow: /tmp/
Disallow all search engines from particular files:
If we had a file like contactus.htm, index.htm, and store.htm we didn’t want bots to crawl we could use this:
User-agent: * Disallow: /contactus.htm Disallow: /index.htm Disallow: /store.htm
Disallow all search engines but one:
If we only wanted to allow Googlebot access to our /private/ directory and disallow all other bots we could use:
User-agent: * Disallow: /private/ User-agent: Googlebot Disallow:
When the Googlebot reads our robots.txt file, it will see it is not disallowed from crawling any directories.
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