How to know IP from Google is OK

I hope it's not changed, some time ago I was wondering too I found some which I found.
209.85.128.0/17 but that's only a small part.

If you want them all:
nslookup -q=TXT _netblocks.google.com 8.8.8.8
nslookup -q=TXT _netblocks2.google.com 8.8.8.8
nslookup -q=TXT _netblocks3.google.com 8.8.8.8
All ip netblocks which can send mail from Google are in there and they will be listed as a result.

Is that what you're looking for?
 
I want to know not the ips from google cand send emails but the trusted IP can crawl my website, because many hackers use the Google Cloud web hosting for hacking attempts.
 
You could do an nslookup which should provide a crawl-xxx-xxx-xxx-xxx.googlebot.com result but that can also be spoofed.
The ranges are not static. You can find many answers about that on the internet. Like this one:

First of all "Google crawls from many IPs and they have confirmed that they do periodically add new ones. And there are also various Googlebot useragents, not just the regular one. This is why Google doesn't publish a list of all the IPs, because there are so many of them and they can change" .
Click to expand...
and
support.google.com

Googlebot and Other Google Crawler Verification | Google Search Central | Documentation | Google for Developers

You can check if a web crawler really is Googlebot (or another Google user agent). Follow these steps to verify that Googlebot is the crawler.
support.google.com support.google.com

There are some known ranges, but they can change.
66.249.64.0/20 are most often used it seems. But there are others.
 
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