1/14/2024 0 Comments Ip subnet mask![]() Number of Hosts per Network: Research/Reserved/Experimental.First octet value range from 240 to 255.These are reserved for research purposes. Number of Hosts per Network: MulticastingĬlass E IP addresses are not allocated to hosts and are not available for general use.First octet value range from 224 to 239.Another example is the delivery of real-time stock market data from one source to many brokerage companies. It is often used for audio and video streaming, such as IP-based cable TV networks. Multicasting allows a single host to send a single stream of data to thousands of hosts across the Internet at the same time. Special IP Range: 127.0.0.1 to 127.255.255.255 (See Special IP Addresses below for more information)Ĭlass D IP addresses are not allocated to hosts and are used for multicasting.Private IP Range: 192.168.0.0 to 192.168.255.255 (See Private IP Addresses below for more information).First octet value range from 192 to 223.Class C network number values begins at 192 and end at 223. The last octet (8 bits) represent the host ID and allows for 254 hosts per network. And the remaining 21 bits of first three octets complete the network ID. In a class C IP address, the first three bits of the first octet are always 1 1 0. Class C allows for approximately 2 million networks by using the first three octets for the network ID. Private IP Range: 172.16.0.0 to 172.31.255.255 (See Private IP Addresses below for more information)Ĭlass C Public & Private IP Address RangeĬlass C addresses are used in small local area networks (LANs).First octet value range from 128 to 191.Class B network number values begin at 128 and end at 191. The 16 bits in the third and fourth octet represent host ID and allows for approximately 65,000 hosts per network. The remaining six bits, together with the second octet, complete the network ID. 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). So, for example, a Netmask that is 24-bits long is 255.255.255.0:Ī Netmask that is 16-bits long is 255.255.0.In the IPv4 IP address space, there are five classes: A, B, C, D and E. This number is the length of the Netmask in bits: Sometimes you will see that a Netmask is defined by one number, e.g., 24. Netmask defines how "large" a network is or if you're configuring a rule that requires an IP address and a Netmask, the Netmask will signify to what range of the Network the rule will apply to:Īpplies to IPs in the 192.168.55.0 - 192.168.55.255 range The 0 and 255 are always assigned and cannot be used. For example, in 255.255.225.0, "0" is the assigned network address. In a netmask, two bits are always automatically assigned. A Netmask is a 32-bit "mask" used to divide an IP address into subnets and specify the network's available hosts.
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