My server, godaddy, has said that in order for some of their security scans to work, that their IP addresses need to be unblocked on the WP account.
I think when you do speak with your host provider you should ask them "What does that even mean?" ;)
WordPress software does not block any access. However there may be some other software or config that they are referring to that is causing them to make a statement like that.
If you can get clarification from your host provider about what they're asking of you then one of us volunteers may be able to help you here.