It's very difficult to have a legit host with different class-C Ip. You can try to ask them an other IP each month praying for their class-C is over...
In any case host that give you multiple IP (in different class-C range) are very expensive.
The best solution (even more in BH) is to have multiple cheap host, you can find nice one for 5$/month and most of host will bill you around 5$/month/ip. So don't put all your eggs on the same host![]()
A lot of hosts have multiple class C networks available but they won't sell you IPs from different blocks. They are assigned in order.
So, the way you can get different class C IPs is to request a single new IP every once in awhile. I ask for a new one every month or so and it's always been different so far. Takes time but cheaper than paying for SEO hosting.