I can find fiery discussions about this and my thought is Google sees right through that and it could damn your SEO to the sixth or seventh level of SEO Hell.

https://moz.com/community/q/how-important-are-different-class-c-subnets-and-ip-s is just one of those discussions but the takeaway here is Google sees it and you are more likely to incur a SEO ding than not.

Try taking this up in SEO discussion forums where others like this stuff.