IPv4 Addresses
•Class A –     1.0.0.0 to 126.255.255.255
–126 large organizations (all gone)
•Class B – 128.0.0.0 to 191.255.255.255
–214 networks each with 216 hosts
•Class C – 192.0.0.0 to 223.255.255.255
–221 small networks , 255 hosts