Questions on Spiders for Freesites

[crazypornstar]

Hi, recently i had one of my servers under assualt for
dos attacks and brute force. In order to get it under control
i have been banning some ip's that were trying to
spider the /images/ folders.

How do i make sure not to block the
spiders from the link lists?
Is there a list of ip address?
Do they come directly from the parent domain?

Thank you for your help.

Ed