Are you in school or a College? If so then they're blocked for a reason. However if this is your computer then perhaps a firewall is blocking them.
I agree with Laptop65. Most school have filters turned on which allow limited access where connecting to which server [.com/org/net]. If this is happining with your IP Provider, try contacting them, maybe they had some server error or limited connectivity. I had this kind of similar problem with my IP Provider which I cant access some websites for some reason
EDIT:Saw your post now: Try contacting your IP Provider rayo since it isnt you, maybe they have a problem

