I'm not sure what you mean by "IPX528". This doesn't appear to be a standard code or designation that I recognize. Could you please provide more context or clarify what you're referring to?

Some possibilities could be:

1. A model number for a product

2. A code used in a specific field (like engineering, manufacturing, etc.)

3. A typo of some kind

If you can give me more information about where you saw this code or what it might relate to, I'd be happy to try and help you further.