224.0.0.1 is a Special Purpose IP Address.

The 224.0.0.0/4 Address Block is allocated for multicast address assignments, formely known as the Class D address space.
[ RFC1112, ^ ] , Host Extensions for IP Multicasting

224.0.0.0/24 - Local Network Control Block
Addresses in the 224.0.0.0/24, the Local Network Control Block are used for protocol control traffic that is not forwarded off link.
[ RFC5771, ^ ]


224.0.0.1 - All Systems on this Subnet
References: [ RFC1112, ^ ][Jon_Postel]

  
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