IPv4 Multicast Valid Range Addressing

IPv4 Multicast Group Address should be belongs to any of the range between,

starting from 224 to 239 , rest of ranges can't be accepted as IPv4 Multicast Group Valid Addressses

Ex: 224.0.0.0/24 to 239.0.0.0/24


By the what is multicast means

A Simple Real time example:
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Multicast can describe follows, Being member of mailing group, whenever some one post message to that group, the person part of the group too receives mail. 

Ex: group name: xyz
members:
 john
arun
rahul
ram
..etc

here members are physically present, they have their own characteristics, whereas group name: xyz, no one present, it means that its a logical address, mapped with subscribed members.

therefore whenever there is a message post to a group xyz all the members would be getting a message.

Thanks.

let me know for any clarifications.