Agree with Opiemarket –
One question though. I have several domains all hosted with the same hosting company. Only two of them are semi-related in content but all of these domains are set up with their own dedicated IP address. How does the search engines view that? Will it still hurt because they are on the same block? At least I assume they are on the same block because they are all with the same company.
Whatever the case, I have learned to always have my own IP because if you are sharing with other users and one of those users are spamming or doing something the search engines don’t like, everyone on that IP will be affected.