RJ45 Male to 2 Female Splitter DSL LAN Network Ethernet Adapter Cable - Walmart.com
Amazon.com: RJ45 Ethernet Splitter Connectors 1 to 2 Splitter Connectors Adapter LAN Ethernet Plug Connector Compatible with Cat5 Cat6 Cable, Two Computer Can Surf The Internet at The Same Time (Black, 4
Ethernet Hack. How to split one ethernet cable for a few devices. One ethernet jack for two PC - YouTube
How-to Make Your Own Ethernet "splitter" : 7 Steps - Instructables