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I'm not sure what extended zip codes are as I'm only aware of the zip codes like 90210 which cover a large area. But here in the NL a lot of online shopping for example don't even ask you for the street name, just the post code (4 digits + 2 letters) and of course your house number. You type in the post code and the street name gets filled in, leaving you with just the house number to enter.

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You'll see the US's extended ZIP codes referred to as Zip+4, as they have nine digits instead of the usual five. So, 90210-1234 refers to a specific Delivery Sector and Delivery Segment within Beverly Hills. The segment can be a particular building or even just one floor of a building. Or, it can refer to all the buildings on one side of the street. It's up to the post office.

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