Is hosting will be dominant or effectuate for SERP ? if yes, how to choose the best hosting for increase my SERP in google ?
Hosting will have no more impact on your SERP than renting an office will increase your sales. Hosting, like office space, is simply a location. Once you have a web hosting account, your task is to optimize your site for SEO. The host you select for your site is essentially irrelevant in terms of SEO/SERP. You do want to be sure you use a reliable hosting service that provides flexibility, redundancy, and consistent up-time.
This link will give you information on Class C IP's. I went to Google and typed in: Class C IP http://www.computerhope.com/jargon/i/ip.htm
Just make sure you have a fast hosting and can handle the kind of traffic you are expecting. Otherwise you will have many visitors abandoning your site even before it loads up.
Yes, the hosting has some effect in SERO. Before hosting you must plan in which country you are going to target your website? If you are going to make a website for Germany then it's better to host your site in German server and if you are going to target Us then Us server will do great work for your SERP in google. Google always supports local websites. So, while searching websites it highly recommend to the same location from where the query is given. and i think for the same reason google established mopre than 80 data centre around the world.
the only way you can tie hosting and seo together, is that you want good hosting, fast and reliable hosting.. you don't want your sites down with the spiders or guest visit..
Some Hosting Block Bot to crawler Web, Because Some bot (ex Yahoo! Slurp) use more traffic resource to crawler. It effective to web seo.
The only thing that hosting might affect is if you host multiple sites, you want to make sure they are different IPs and if possible different C Blocks so when you link the sites together you get more juice.
Finally this is the right answer... You can not afford to have your site down because of your hosting provider.