I noticed my error log had this. The IP, 35.205.21.104, located to Google.
[Mon Apr 30 10:07:16.373485 2018] [:error] [pid 15476] [client 35.205.21.104:51858] File does not exist: /home/mysite/public_html/admin.php
We never submitted that url to Google. Could that be someone on Google sites/blog or other app trying to hack my site?
I'd hate to deny them in htaccess if it's Googlebot acting innocent.
That is a google cloud ip address (which could be anyone) but it is not Googlebot (which has reverse ptr something like crawl-(.*).googlebot.com.)
This ip is: host 35.205.21.104 104.21.205.35.in-addr.arpa domain name pointer 104.21.205.35.bc.googleusercontent.com.
So, No. That is certainly not Googlebot.