https://www.ifreeicloud.co.uk/free-check

Site looks shady but it works.

Enter IMEI/serial, and get this:

Checks Model, Capacity, Colour, Find My iPhone Status, Replaced Status, Activation Status, Service Coverage, Technical Support, Warranty Plan, Warranty Expiry & Loaner Status for Apple devices. You can also check non-Apple devices to find the Model & Manufacturer.
Useful if you are buying used Apple devices.