Classes of IP Address

Unicef · Created Mar 8, 2021 03:14:16

Good

Iyad · Created Mar 8, 2021 21:40:59

VLSM and CIDR were introduced to use the IP addressing space in a more efficient and replaces the previous system based on Class A, Class B and Class C networks.

VLSM (variable-length subnet masking ), which enables network engineers to divide an IP address space into a hierarchy of subnets of different sizes, making it possible to create subnetworks with different host counts without wasting large numbers of addresses.

CIDR (Classless Inter-Domain Routing) -- also known as supernetting -- is based on the idea of subnet masks. A mask is placed over an IP address and creates a sub network: a network that is subordinate to the internet. The subnet mask signals to the router which part of the IP address is assigned to the hosts (the individual participants of the network) and which determines the network.

Instead of adding a subnet mask, a specification in the form of suffixes can also be integrated directly into the IP address using classless inter-domain routing. But this not only shortens the display: CIDR also makes it possible to create supernets in addition to subnets. This means that it is not only possible to subdivide a network more precisely, but also to combine several networks.

user_3015189 · Created Mar 11, 2021 19:39:43

Interesting post my friend..thanks

Vien · Created Mar 12, 2021 10:05:19

Thanks for sharing

huyvan · Created Jan 29, 2022 13:05:38

Good share

Class	Address Range	Available IP Network Range	Description
A	0.0.0.0 to 127.255.255.255	1.0.0.0 to 126.0.0.0	The IP addresses with all-0 host IDs are network addresses, and they are used for network routing. The IP addresses with all-1 host IDs are broadcast addresses. A packet with such an IP address is broadcast to all hosts on the network. The IP address 0.0.0.0 is only used for temporary communication after the system in DHCP mode starts up. It cannot be an effective destination address. The IP address with an all-0 network ID represents the current host. This IP address allows the host to use the current network even if it does not know its network ID. The IP addresses with the network ID in the 127.X.Y.Z format are reserved for the loopback test. The packets destined for these addresses will not be sent to the network. These packets are processed internally and considered input packets.
B	128.0.0.0 to 191.255.255.255	128.1.0.0 to 191.254.0.0	The IP addresses with all-0 host IDs are network addresses, and they are used for network routing. The IP addresses with all-1 host IDs are broadcast addresses. A packet with such an IP address is broadcast to all hosts on the network.
C	192.0.0.0 to 223.255.255.255	192.0.1.0 to 223.255.254.0	The IP addresses with all-0 host IDs are network addresses, and they are used for network routing. The IP addresses with all-1 host IDs are broadcast addresses. A packet with such an IP address is broadcast to all hosts on the network.
D	224.0.0.0 to 239.255.255.255	None	The addresses of Class D are multicast addresses.
E	240.0.0.0 to 255.255.255.255	None	The addresses are reserved for future use. The IP address 255.255.255.255 is used as a LAN broadcast address.

Classes of IP Address

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Classes of IP Address

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