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How do you calculate how many ip's are available in an IP Block?
I often see offers posted here and in LET with options like "/27", "/29", "30". I am just wondering what does these notations mean and how do you calculate how many usable IPs (or total IPs) are available? What's the calculation system?
I am just interested to learn about these special notations while mentioning an IP Block.
Sorry for a n00b question
Comments
en.wikipedia.org/wiki/IPv4_subnetting_reference
2^(32-27)
2^(32-29)
2^(32-30)
here is great article for you
http://en.wikipedia.org/wiki/Subnetwork
/29 - 8
/28 - 16
/27 - 32
/26 - 64
/25 - 128
/24 - 256
Usable IPS will be differ 2/3 less than the allocated.
http://www.aelius.com/njh/subnet_sheet.html
@mazker Somehow that's wrong.
Indeed... /23 is defo larger then 256 lol
Fixed
You just used the cheat sheet @ http://www.aelius.com/njh/subnet_sheet.html
Yes. Haha.
Usable ip is not 2/3 number of ip. It's total number of ip minus first ip (network address), gateway and last ip (broadcast ip).
Thats what i mentioned. Read my post again to understand
How about using 'or' instead '/' for number. Or at least put space in between them. -_-