IP Addressing and Subnetting Reference (completed table) Number Number Number First Number of Number of of of of Address octet First binary Default Subnet Hosts on available host Default fixed Networks Class value bits Mask bits per each Network network in the network range network Bits bits 27 2 = – 8 1 = 32 8 = 224 2 = 0 – – – 255.0.0.0, or 0 0 0 0 0 0 0 126 8 A 1-126 7 24 ~16.7M bits, bits, networks 1 bit therefore… therefore… per network 11111111.00000000.00000000.00000000 in the class 214 2 – 16 2 = 32 16 = 216 2 = 1 0 = – – – 0 0 0 0 0 0 16 255.255.0.0, or B 128-191 14 16 ~65K 16,382 bits, bits, hosts 11111111. 11111111.00000000.00000000 2 bits therefore… therefore… per network networks in the class 221 2 – 24 3 = 32 24 = 28 2 = 1 1 0 = – – – 255.255.255.0, 0 0 0 0 0 24 C 192-223 21 8 254 ~2M or bits, bits, hosts per 3 fixed bits therefore… therefore… network networks 11111111. 11111111. 11111111.00000000 in the class This class is not used for D 224-239 assigning IP addresses
IP Addressing and Subnetting Reference (completed table) Address Class First octet value range First binary bits Number of Default Network Bits Default Subnet Mask Number of network bits Number of Networks in the Number of available host bits per network Number of Hosts on each network A 1-126 0 0 0 0 0 0 0 0 1 bit 8 255.0.0.0, or 11111111.00000000.00000000.00000000 8 – 1 = 7 bits, therefore… 27 – 2 = 126 networks in the class 32 – 8 = 24 bits, therefore… 224 – 2 = ~16.7M per network B 128-191 1 0 0 0 0 0 0 0 2 fixed bits 16 255.255.0.0, or 11111111. 11111111.00000000.00000000 16 – 2 = 14 bits, therefore… 214 – 2 = 16,382 networks in the class 32 – 16 = 16 bits, therefore… 216 – 2 = ~65K hosts per network C 192-223 1 1 0 0 0 0 0 0 3 fixed bits 24 255.255.255.0, or 11111111. 11111111. 11111111.00000000 24 – 3 = 21 bits, therefore… 221 – 2 = ~2M networks in the class 32 – 24 = 8 bits, therefore… 28 – 2 = 254 hosts per network D 224-239 This class is not used for assigning IP addresses
IP%20Addressing%20and%20Subnetting%20Reference%20Table.docx