All possible IP addresses

[JungleMan]

how can I find out how many global IP addresses are possible?

[DavidHooper]

Well an IP is in the format:
xxx.xxx.xxx.xxx
where xxx can be between 0 and 255. That is 256 numbers soooooo the answer is 256^4. Which is, ummm, 4294967296.

In IP v7 or whatever version is next there will be six lots of 3 numbers, ie xxx.xxx.xxx.xxx.xxx.xxx, which gives umpteen million address to every square meter of the planet. lol.

[sail3005]

281,474,976,710,656

[sail3005]

well, you gotta figure, aol is probably taking up 50% of all the IP addresses available now

hahaha

[RobIII]

Well,

I'm not a big math-wizz, but there are a few miscalculations:

First, in an IP-range the last address (x.x.x.255) is always a "multicast" address (or router-adress, don't remember exactly) wich can't be used. So that takes out some possibilities. Also x.x.x.254 is (as I recall) preserved.

Second, any address containing a 0 for any octet cannot be used.
(An octet is one x out of x.x.x.x, so there are 4 octets in an IP address).

Third: there are some internal ranges defined wich cannot be used "global". These start with 10.x.x.x, 172.x.x.x and 192.168.x.x (and even some others as I recall).

Fourth: the address 127.0.0.1 is used to define "localhost" wich is your own computer.

Fifth: I need to review my IP-courses as a lot of this knowledge has slipped my mind.

[RobIII]

Sorry, "second" wasn't all true, but I do recall something like that...

[thinktank]

You forgot one important thing..

Subnets ???

Every Ip number can be shared by a sub network using a proxy server. And one of them can again be shared ...and one of them can be shared again and one...

[RobIII]

thinktank: You're right, BUT to the outside world it's all the same IP as the one connecting the others to the net...

[Aurilus]

If you want to calculate all the possible IP addresses (not excluding the ones mentioned as reserved above ^ ) then maybe you could use this.. what possible use this would be to *anyone* whatsoever is beyond me though!

Dim A as Integer, B as Integer, C as Integer, D as Integer
Dim F as Integer

F=FreeFile(1)
Open "IP.Txt" for Output as #F
For A = 0 to 255
  For B = 0 to 255
    For C = 0 to 255
      For D = 0 to 255
        Print #F, A & "." & B & "." & C & "." & D
      Next D
    Next C
  Next B
Next A
Close #F

- Aurilus