RESERVED IPV4 ADDRESSES
Some reserved IP addresses are unusable on the web.
These IPv4 addresses have special
purposes, and it is not possible to route these outside the LAN.
PRIVATE IPV4 ADDRESSES All classes of IP have some addresses that are reserved in the form of private Internet Protocol addresses. It is possible to use these IP addresses in a network, company and campus, plus these are private for that location.
It is possible to route these addresses on the web, so routers drop packets with them. Communicating with people who exist outside of the location requires translating the addresses into some public addresses with NAT, or proxy servers can be utilized for it.
PRIVATE IPV4 ADDRESSES
The only purpose of creating a separate private address range is to keep the allocation of the already-limited IP address space in check. By utilizing a private IP address range in LAN, the global demand for Internet Protocol version 4 addresses has come down considerably. It has helped to delay the IP address exhaustion process as well.
When utilizing the private range, it is possible to choose an IP class according to the requirement and size of your organization. A larger company may pick the class A address range while a smaller one may pick class C. It is possible to further sub-net these addresses and allot them to departments in a company.
LOOPBACK IPV4 ADDRESSES People use the range of IP addresses 127.0.0.0 to127.255.255.255 only for loopback,
which is the self-address of a host, also called the localhost address. The OS itself manages a loopback Internet Protocol address entirely. The addresses allow for communication between the client and server processes on one system. When one process makes a packet through the destination address in the form of the loopback address, that packet will be looped back to itself with no NIC interference.
LOOPBACK IPV4 ADDRESSES The OS will forward data delivered on loopback to a VIF (virtual network interface)
in the OS. The address is largely used as part of testing, such as client/server architecture for one machine. Besides that, when one host machine is capable of pinging any IP out of loopback range, it suggests that the machine has a successfully loaded, working TCP/IP stack.
LINK-LOCAL IP ADDRESSES Assume that a host cannot get an Internet Protocol address out of the DHCP
(Dynamic Host Configuration Protocol) server and that no IP address is allotted to that machine manually. In that case, it can allot itself an address out of a reserved Link-Local address range. It is impossible for the IP addresses to communicate as they belong to different logical or physical segments. It is also not possible to route these addresses.
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