IP addressing:
Underlying the symbolic addressing that users find convenient and memorable, the internet systems actually use numbers to identify each computer. A numeric address (or IP address) typically uses a set of four numbers separated by dots. For example:
193.22.33.201
This form of address uniquely identifies a computer by these four numbers. Each number fits into 8 bits (so that each number must be in the range 0 to 255) making 32 bits in total. It is often known as dotted quad notation or IP Version 4 (IPv4) addressing.
Owing to the huge number of people now using the internet, there are not enough IPv4 addresses available to meet the expected future demand - 32 bits allow 4.2 billion addresses, in theory, although less in practice because of the way addresses are allocated in blocks to particular users. So a new version of IP addressing, IP Version 6 (IPv6) is being introduced. IPv6 uses 128 bits in total, allowing 3 6 1038 addresses. This works out at 6 6 1023 addresses for every square metre on the planet, so it should be quite a while before these addresses are all allocated!
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