There’s a ton of these still available - e.g. https://www.amazon.com/CAPUP-Ethernet-Splitter-Shielded-Internet/dp/B0C53P86WN/ https://www.amazon.com/CAPUP-Ether

There’s a ton of these still available - e.g. https://www.amazon.com/CAPUP-Ethernet-Splitter-Shielded-Internet/dp/B0C53P86WN/ https://www.amazon.com/CAPUP-Ethernet-Splitter-Shielded-Inte... The reviews of them are full of negative comments from people who don’t understand what they are, and think they’ll split one network cable into two, like a three-port switch - even though most of the listings are quite clear that you need to connect two ports at each end of the connection. Most of the listings are, though, quite evasive about the fact that, even used correctly, they’ll not provide throughput over 100Mbps.