RJ45 Ethernet Splitter, RJ45 1 Male to 3 x Female LAN Ethernet Splitter Adapter Cable Suitable Super Cat5, Cat5e, Cat6, Cat 7 LAN Ethernet Socket Connector Adapter-Black Network Connectors/Adapters - Newegg.com
Source RJ45 Splitter Adapter, Ethernet Splitter 1 to 2 Network Adapter CAT 5/CAT 6 LAN Splitter Ethernet Socket Connector Adapter on m.alibaba.com
Amazon.com: RJ45 Network 1 to 2 Port Ethernet Adapter Splitter, RJ45 1 Male to 2 Female LAN Ethernet Splitter Adapter Cable Suitable Super Cat5, Cat5e, Cat6, Cat7 LAN Ethernet Socket Connector Adapter : Electronics
RJ45 Splitter Adapter 1 to 2 Ways Dual Female Port CAT5/6/7 LAN Ethernet Cable, 1 - Ralphs
PoE Splitter with USB Type C - 5V 2A - 100 MB Ethernet : ID 4552 : $14.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Rj45 Network 1 To 2 Port Ethernet Adapter Splitter, Rj45 1 Male To 2 Female Lan Ethernet Splitter Adapter Cable Suitable Super - Data Cables - AliExpress