Hi, just asked OVH what are their limits how many IPs can i buy to server.
Here it is:

To the Kimsufi servers it is possible to order up to 3 additional IP addresses.
The price of each IP is $1.5 aprox. (30kč)

So called IP Blocks RIPE canot be bought for Kimsufi servers.

Other dedicated servers, maximum 3 IP failover per server and additionally you can buy IP Failover (FO) RIPE with these limits:
SP: Max 32 IP FO RIPE
EG, MG: Max 128 IP FO RIPE
HG: Max 256 IP FO RIPE