A method, based on operations of parsing a set into two subsets and then multiplying elements of one subset by those of the other subsets, for expanding the assignable Internet IPv4 public address pool consists of introducing a new category of routers, named Semi-Public Router (SPR), utilizing addresses within a reserved address block by transporting such as data via an existing mechanism within the IPv4 protocol. Each SPR is to be deployed inline between an Edge Router and a subscriber premises that it serves, resulting in the additional addressing capacity for serving many more subscribers. This enhanced operation is fundamentally transparent to current Internet equipment. Consequently, existing routers are not affected, thus no modification is imposed on their current practices.