SEO hosting is not different from other web hosting plans. It is just a marketing ploy to attract people who are more concerned about SEO than their actual website.
- Unlimited number of IP addresses,
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FYI, for each IP you will need to provide justification and if say you want IP addresses in bulk for SEO purposes, then I am sure reliable hosting companies will tell you to look another hosting company.
Nothing is unlimited on this earth and web hosting field is not exceptional.