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How to Detect and Verify Search Engine Crawlers | Onely Blog
Baidu *.crawl.baidu.com
Baidu *.crawl.baidu.jp
Bing *.search.msn.com
Googlebot *.google.com
Googlebot *.googlebot.com
Yahoo *.crawl.yahoo.net
Yandex *.yandex.ru
Yandex *.yandex.net
Yandex *.yandex.com
SEO 
21 hours ago by kbonnet
Twitter
"At the end of the day, only runs successfully if you have a goal in mind in the first place, and your create…
SEO  from twitter
21 hours ago by jhill5
Verifying Googlebot - Search Console Help
Verifying Googlebot
You can verify if a web crawler accessing your server really is Googlebot (or another Google user-agent). This is useful if you're concerned that spammers or other troublemakers are accessing your site while claiming to be Googlebot. Google doesn't post a public list of IP addresses for webmasters to whitelist. This is because these IP address ranges can change, causing problems for any webmasters who have hard-coded them, so you must run a DNS lookup as described next.

To verify Googlebot as the caller:

Run a reverse DNS lookup on the accessing IP address from your logs, using the host command.
Verify that the domain name is in either googlebot.com or google.com
Run a forward DNS lookup on the domain name retrieved in step 1 using the host command on the retrieved domain name. Verify that it is the same as the original accessing IP address from your logs.
Example 1:

> host 66.249.66.1
1.66.249.66.in-addr.arpa domain name pointer crawl-66-249-66-1.googlebot.com.

> host crawl-66-249-66-1.googlebot.com
crawl-66-249-66-1.googlebot.com has address 66.249.66.1
 

Example 2:

> host 66.249.90.77
77.90.249.66.in-addr.arpa domain name pointer rate-limited-proxy-66-249-90-77.google.com.

> host rate-limited-proxy-66-249-90-77.google.com
rate-limited-proxy-66-249-90-77.google.com has address 66.249.90.77
SEO 
yesterday by kbonnet
Twitter
A3: that's a bit of a baited question. You should spend as much time on as necessary to achieve the…
SEO  from twitter_favs
yesterday by jhill5

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