Cisco subnet mask table2/21/2023 For example, IP address 10.90.45.1 with a mask of 255.0.0.0 is broken down into a network IP address of 10.0.0.0 and a host IP address of 0.90.45.1. The remaining digits are available for host IP addresses. The digits in bold indicate the network section of the IP address for each class. The table below lists ranges of IP addresses by class and the masks associated with each class. The number of bits allocated to the network section is represented by a mask written in dotted decimal or with the abbreviation / n where The range of IP addresses in each class is determined by the number of bits allocated to the network section of the 32-bit IP address. In order to provide some structure to the way IP addresses are assigned, IP addresses are grouped into classes. For more information see RFC 791 Internet Protocol at The division is accomplished by arbitrarily ranges of IP addresses to classes. IP addresses are further subdivided into two sections known as network and host. They are intended for use in private networks. These IP addresses are not routable on the Internet. The IP addresses in the table above are from RFC 1918,Īddress Allocation for Private Internets. The table below shows some examples of IP addresses. IP addresses are typically written in a format known as dotted decimal IP addresses are divided into four sections of one byte (octet) each The following are characteristics of IP addresses: An IP network address identifies a specific network segment to which one or more hosts can be connected. Binary to Decimal Number Conversion for 135 to 255 IP Address StructureĪn IP host address identifies a device to which IP packets can be sent. The figure below provides binary to decimal number conversion for 135 through 255.įigure 3. Binary to Decimal Number Conversion for 0 to 134 The figure below provides binary to decimal number conversion for 0 through 134.įigure 2. The figure below is an example of an 8-digit binary number.įigure 1. A basic understanding of binary numbering is very helpful if you are going to manage IP addresses in a network because changes in the values of the 32 bits indicate either a different IP network address or IP host address.Ī value in binary is represented by the number (0 or 1) in each position multiplied by the number 2 to the power of the position of the number in sequence, starting with 0 and increasing to 7, working right to left. The 32 bits are divided into four octets (8-bits). Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table at the end of this module. For the latest caveats and feature information, seeīug Search Tool and the release notes for your platform and software release. Your software release may not support all the features documented in this module. This chapter contains information about, and instructions for configuring IPv4 addresses on interfaces that are part of a networking device.Īll further references to IPv4 addresses in this document use only IP in the text, not IPv4. Example Maximizing the Number of Available IP Subnets by Allowing the Use of IP Subnet Zero.Example Using IP addresses with 31-Bit Prefixes on Point-to-Point WAN Interfaces to Limit Number of IP Addresses Required. Example Using IP Unnumbered Interfaces on Point-to-Point WAN Interfaces to Limit Number of IP Addresses Required.Example Increasing the Number of IP Hosts that are Supported on a Network by Using Secondary IP Addresses.Example Establishing IP Connectivity to a Network by Assigning an IP Address to an Interface.Configuration Examples for IP Addresses.Using IP addresses with 31-Bit Prefixes on Point-to-Point WAN Interfaces to Limit Number of IP Addresses Required.Using IP Unnumbered Interfaces on Point-to-Point WAN Interfaces to Limit Number of IP Addresses Required.Specifying the Format in Which Netmasks Appear for an Individual Line.Specifying the Format in Which Netmasks Appear for the Current Session.Maximizing the Number of Available IP Subnets by Allowing the Use of IP Subnet Zero.Increasing the Number of IP Hosts that Are Supported on a Network by Using Secondary IP Addresses.Establishing IP Connectivity to a Network by Assigning an IP Address to an Interface.
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