There are definitely getting to be more available. Bel Canto e1X and Black EX DACs both have Ethernet input. Disclosure: we're a Canadian Bel Canto dealer.
Gold Note is another and there are more as well. But, still not very common at all.
Well a stand alone DAC with an Ethernet connection is called a music streamer with a DAC.
The streamer converts packetized internet signal to digital bit stream. This process if done correctly requires a high level of sophistication and a box.... is a stand alone component. The DAC then converts the digital bitstream into a line. Level analog signal that can be amplified in the analog realm. Done correctly it requires high level of sophistication and a box. They can be combined... but usually there are compromises.
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