Some numbers are reserved for network and host IDs for network itself that are as follows: Number 127 is used for internal testing (entire subnet 127.0.0.0 is reserved for internal testingl and it is known as loopback address. Messages sending to address.

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• 127.0.0.1 never leave the sending machine instead they are redirected back through the internal software layers to communicate with network software running on the "local host".

• As we know that zero refer to the host 10 and all zeros in the binary value are used to refer the network itself.

• The host 10, that is, all 1 s in binary is reserved as a broadcast address with in a given network for all hosts on this network.

• If the bits in the network portion are all 1 s. the address is reserved.

• The range 224.0.0.0 through 255.255.255.254 is reserved for experimental use and, 255.255.255.255 is the universal address.