The first two bits in the first octet are always 1 0. Class B allows for 16,384 networks by using the first two octets for the network ID. Number of Hosts per Network: 16,777,214Ĭlass B Public & Private IP Address RangeĬlass B addresses are for medium to large sized networks.Private IP Range: 10.0.0.0 to 10.255.255.255 (See Private IP Addresses below for more information).Class A network number values begin at 1 and end at 127. The 24 bits in the remaining three octets represent the hosts ID and allows for approximately 17 million hosts per network. The remaining seven bits in this octet complete the network ID. The first bit in this octet, is always zero. Class A allows for 126 networks by using the first octet for the network ID. Class A Public & Private IP Address RangeĬlass A addresses are for networks with large number of total hosts. The four octets that make up an IP address are conventionally represented by a.b.c.d - such as 127.10.20.30.Īdditionally, information is also provided on private addresses and loop address (used for network troubleshooting). The list below shows the five available IP classes, along with the number of networks each can support and the maximum number of hosts (devices) that can be on each of those networks. Class D and class E are for special uses. ![]() Primarily, class A, B, and C are used by the majority of devices on the Internet. Each class has a specific range of IP addresses (and ultimately dictates the number of devices you can have on your network). If your computer contains multiple network interfaces, you will need to select the correct one from the list.In the IPv4 IP address space, there are five classes: A, B, C, D and E. For Windows 9X, ME, click on Start, Run, and enter winipcfg.For Windows NT, 200X, XP, Vista, 7, and 8, please refer to Checking IP parameters (IP Address, Subnet, Netmask, Router Gateway) in Mac OS X and Windows operating system environments for more information on how to obtain the subnet mask.How to find the Subnet Mask on your computer's Network Card If you have no network administrator, consult the individual(s) who set up your network. Otherwise, you will need to contact your network administrator. Generally, you can find out what gateway to use on your printer by identifying the gateway being used by your computer's network interface card (see below). Note: In a Lexmark context, the subnet is one third of the IP scheme (IP, Netmask, Gateway) that you need to know before you can begin your printer wireless or network setup. Subnet masking allows routers to move packets more quickly. The appropriate subnet mask carried along with the packet would be 255.255.255.0, or a string of all 1's for the first three quads (telling the router to look at these) and 0's for the host number (which the router doesn't need to look at). Using the previous example (which is a very typical case), the combined network number and subnet number occupy 24 bits or three of the quads. The division of an organization's network into subnets allows it to be connected to the Internet with a single shared network address. In a binary mask, a " 1" over a number says "Look at the number underneath" a " 0" says "Don't look." Using a mask saves the router from having to handle the entire 32-bit address it can simply look at the bits selected by the mask. ![]() ![]() A mask is simply a screen of numbers that tells you which numbers to look at underneath. The router knows which bits to look at (and which not to look at) by looking at a subnet mask. For more information refer to Definition of an IP Gateway. Once a packet has arrived at an organization's IP gateway or a connection point with its unique network number, it can be routed within the organization's internal gateways using the subnet number. ![]() The subnet mask explains that the first three numbers in a dotted-decimal address (for example: 192.168.1) are the network and that the last number denotes a specific computer on that network. 5 is the address of the specific machine on that network (also known as the host ID). The portion of the address that reads 192.168.1 is the network address (also known as the network ID), and the. For example, a computer with an IP address of 192.168.1.5 might have a subnet mask of 255.255.255.0. The subnet mask is the portion of an IP address that defines the network, as opposed to identifying a particular computer.
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