3/20/2023 0 Comments Ip and subnet mask tableThe first entry in the Class A table (/10 subnet mask) borrows two bits (the leftmost bits) from the host portion of the network for subnetting, then with two bits you have four (2 2) combinations, 00, 01, 10, and 11. The fifth column shows the number of subnet mask bits.īits Borrowed Subnet Effective Number of Number of Subnetįrom Host Portion Mask Subnets Hosts/Subnet Mask BitsĢ3 255.255.255.254 8388608 2* /31 Class B Host/Subnet Table Class B Subnet Effective Effective Number of Subnetġ5 255.255.255.254 32768 2* /31 Class C Host/Subnet Table Class C Subnet Effective Effective Number of Subnetħ 255.255.255.254 128 2* /31 Subnetting Example The fourth column shows how many valid hosts are possible on each of these subnets. The third column shows how many subnets are possible. The second column shows the resulting subnet mask in dotted decimal format. The first column shows how many bits are borrowed from the host portion of the address for subnetting. There are three tables, one for each class of addresses. The following tables show all possible ways a major network can be subnetted, and, in each case, how many effective subnets and hosts are possible. A subnet mask defines which portion of the address is used to identify the network and which denotes the hosts. This is done by borrowing bits from the host portion of the IP address, enabling more efficient use of the network address. Subnetting is the concept of dividing the network into smaller portions called subnets. Multicast IP addresses have their first octets in the range 224 to 239.Ĭlass E-Reserved for future use and includes the range of addresses with a first octet from 240 to 255. The first octet range of 192 to 223 is a Class C address.Ĭlass D-Used for multicast. Any address whose first octet is in the range 128 to 191 is a Class B address.Ĭlass C-The first three octets denote the network address, and the last octet is the host portion. Note that 0 is reserved as a part of the default address, and 127 is reserved for internal loopback testing.Ĭlass B-The first two octets denote the network address, and the last two octets are the host portion. Any IP address whose first octet is between 1 and 126 is a Class A address. The following are the classes of IP addresses.Ĭlass A-The first octet denotes the network address, and the last three octets are the host portion. Refer to Cisco Technical Tips Conventions for more information on document conventions. This document is not restricted to specific software and hardware versions. There are no specific requirements for this document. For more information on IP addressing, refer to IP Addressing and Subnetting for New Users. Each of the octets can be represented in a decimal format, separated by decimal points. The IP address is generally represented using the dotted-decimal notation, where 32 bits are divided into four octets. The host (or node) address is used to identify a particular device attached to the network. The network address is used to identify the network and is common to all the devices attached to the network. An IP address is 32 bits long and made up of two components, a network portion and a host portion.
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