The way I understand it... you are given a dynamic IP address. For certain providers, static IP address are a premium. A corresponding additional monthly fee is paid for something like that. Not sure if Globe provides static IP address for Wimax subscriptions.
Nope. Only Commercial DNS are automatically have Static I.P for more info please contact the hotline. I am also sure that your'e i.p was blocked due to Globe's Wimax IP-Pool have a history on Stopforumspam databases