How many times IP address can be assigned in the internet?

Answer 1

One per independent network that it is connected to.

For example a computer connected to two ethernet networks (via different adapters) and to a wi-fi network will have 3 different IPs assigned: one for each net.

It is more typical for a computer to be connected to only one network at a time, in which case it would never have more than one IP assigned.

Answer 2

The number of available addresses is only limited by the current IP technology in use. We are currently using IPv4, which allocates 4,294,967,296 (232) possible unique addresses. In the next few years the internet will be migrating towards IPv6, which uses hex characters for each octet as opposed to numerical. In theory using IPv6, there would be exactly 2128, or about 3.403 × 1038 unique host interface addresses. Although just as we are upgrading IP technologies now, this number will one day not be enough.

Writing for Technology Review in 2004, Simson Garfinkel wrote notes that there will exist "roughly 5,000 addresses for every square micrometer of the Earth's surface".

Answer 3

I'm going to assume we're talking about IPv4, not the new and not-implemented-everywhere IPv6.

an IPv4 address consists of four bytes (8 bits each, 256 possible values per byte) generally written in decimal as, for instance, 192.168.1.255. so if every possible combination of values was legal, there would be 256*256*256*256 (4,294,967,296) possible addresses.

however, the first byte of an IPv4 address is limited to the values 1-126 and 128-223, so there are 222*256*256*256 (3,724,541,952) legal addresses.

there are also ranges of addresses that are considered "private subnets," and exist only behind routers (off the internet proper). for example, the 65536 addresses in 192.168.x.y cannot exist on the internet proper, but they're what you'll find in your office, school, or home LAN. there can be many, many 192.168.x.y subnets, each fronted by a "real" IP address assigned to a router, which makes all machines on the local subnet appear at the same internet IP address. the router connecting your LAN to the internet uses something called NAT (network address translation) to make the devices on your LAN believe they're actually on the internet. addresses 10.x.y.z and 172.16-31.x.y are similarly reserved for private networks.

I'll leave the math to you - subtract the 192.168.x.y, 10.x.y.z, and 172.16-31.x.y addresses from my previous number and that should be the number of "real" addresses on the internet, minus those reserved for local networks.

the above should be pretty accurate, but I'm a software engineer, not a network god.

Answer 4

if by address, you mean street address, then every street address that pays for internet access through an isp has an ip address.

Answer 5

Each address can only be used once at any given time.

Answer 6

Since IP4 uses 32-bit technology, the maximum number of possible addresses is 4,294,967,296

Answer 7

about 16 million

Answer 8

1