Please help Port fordword iprange!

Hi i have a freepbx system on my VPS and have my default iptables rule to drop. I have added my ip to an allow table and its working fine but i have a dynamic ip.
does anyone know how to ad my iprange for ?

I cant use fail to ban as it stops after 24’s as my vps allows only 109 tables!

If anyone knows a cheap vps host based in the uk thats another option!