I don't know what an IPP is but I bought a networked Xerox all in one, plugged it into my network and it just showed up on all my devices (mind, they're mostly Apple). So whatever they're doing, it ain't so bad.
I did have to cover the power led with black nail polish though. It was lighting up the whole room.
You can also get sheets of hundreds of small little black dot stickers that are perfect to use on LEDs. Some of them are thin enough to let some light through an individual one, so you can choose to dim or entirely block by adding one or 2-3...
You can’t remove the nail polish (without likely damaging the base surface) when you want to sell or gift the device to someone else, and it doesn’t look good on non-black devices. (Even on black devices you might not like its glossiness.) Black nail polish also completely blacks out the light, whereas one might only want to reduce the brightness (which the product I linked to supports).
Current Xerox printers definitely do support IP, but you need Windows to configure them (the proprietary app that will connect the printer to the network only runs in Widows).
I configured the internal IP via the printer's control panel actually.
But of course, you need a printer with a control panel on it.
I got the cheapest b&w laser (i print so little that inkjet is out of the question) all in one that had ethernet (B225). It has a tiny display and some buttons. You can set it up and use it like a copy machine at the least from it.
I may be misunderstanding, but it seems to me that you're talking about a printer that is already connected to the local network? But in my case, the software was needed to connect the printer to the wifi.
Xerox doesn't have any IPP Everywhere devices, so I hope this isn't Lexmark's death knell.