Class       Address Range                   Supports
Class A     1.0.0.1 to 126.255.255.254      Supports 16 million hosts on each of 127 networks.
Class B     128.1.0.1 to 191.255.255.254    Supports 65,000 hosts on each of 16,000 networks.
Class C     192.0.1.1 to 223.255.254.254    Supports 254 hosts on each of 2 million networks.
Class D     224.0.0.0 to 239.255.255.255    Reserved for multicast groups.
Class E     240.0.0.0 to 254.255.255.254    Reserved for future use, or Research and Development Purposes.