Question about visibility

[Admin Hardy]

I realise this is not specifically a BIND/DNS question and a bit off 
topic so please ignore if need be I realise people are often very busy.

If you you have a website but the host IP you do not list with any 
domain name in DNS, is it definite that this site could never be reached 
via Google.  I do not really know the nuts and bolts of how Google gets 
access to pages.

If for 'some particular reason' instead of developing a site on a local 
dev machine on your LAN and then uploading/installing the site to a 
remote server, you needed 'for what ever reason' to do the development 
and testing on the final live host accessing it via the ip address, 
would this be a way to be 'almost certain' of keeping it hidden from 
unwanted accidental exposure?

Thanks.