Get Shipping rates in Classic .net VB

I am looking for classic asp .net code to get usps shipping rate.

I need our shipping dept to go to a web page and get the shipping rate.
I currently have it so when they scan a item it shows the product description and weight.
I need to take that weight and get a shipping cost with per defined from and to zip codes.

This can be run in the same web site as the store so we can use the shipping dll.

Thanks in advance

USPS may require more address info than just "from and to zip codes".
It would be best to create a nopC web service plugin that wraps the call to shipping rate calculation, because the GetShippingOptions method requires a parameter of type GetShippingOptionRequest, and also the class uses DI to resolve service class/methods.  Your classic ASP.NET web would call the web service.