A few IP addresses have special meanings and are not assigned to specific hosts. An all-zero host ID refers to the network itself. For instance, the IP address 129.152.0.0 refers to the Class B network with the network ID 129.152.
An all-ones host ID signifies a broadcast. A broadcast is a message sent to all hosts on the network. The IP address 129.152.255.255 is the broadcast address for the Class B network with the network ID 129.152. (Note that the dotted decimal term 255 corresponds to the all-ones binary octet 11111111.)
The address 255.255.255.255 can also be used for broadcast on the network.
Addresses beginning with the term 127 are loopback addresses. A message addressed to a loopback address is sent by the local TCP/IP software to itself. The loopback address is used to verify that the TCP/IP software is functioning.
RFC 1597 also reserves some IP address ranges for private networks. The assumption is that these private address ranges are not connected to the Internet, so the addresses don't have to be unique. In today's world, these private address ranges are often used for the protected network behind network translation devices:
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10.0.0.0 to 10.255.255.255
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172.16.0.0 to 172.31.255.255
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192.168.0.0 to 192.168.255.255
1 comment:
Here in my province I have a friend named his internet cafe NETWORKZ. I hope its not you my friend. Anyway you have a great blog. thanks for sharing
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