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TOPIC: How to solve this problem

How to solve this problem 7 years 7 months ago #29447

  • superfly
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Given - 16.20.0.0 / 16
Requirement - I need 1000 host address / 500 n/w address / 4096 n/w address ( 16.0.0.0 / 8 )
1) What is 1st valid host address
2) What is 2nd last Broadcast address.
I know its too nooby :p i forgot the calculation to this problem.
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Re: How to solve this problem 7 years 7 months ago #29450

  • Smurf
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Nothing like learning;

Take a look at these resources and give it a go, i'm sure if you post your answers someone will validate them for you and point out any mistakes.

www.firewall.cx/ftopict-2823.html
www.firewall.cx/ftopict-2145.html
www.firewall.cx/ip-subnetting-intro.php
Wayne Murphy
Firewall.cx Team Member
www.firewall.cx

Now working for a Security Company called Sec-1 Ltd in the UK, for any
Penetration Testing work visit www.sec-1.com or PM me for details.
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Re: How to solve this problem 7 years 4 months ago #30278

16.0.0.0/8 is a regular class A address, so you have 16,777, 314 hosts. First host is 16.0.0.1, boradcast is 16.255.255.255, last host is 16.255.255.254.

For 1000 hosts you need a /22 as a minimum (1022 hosts) which gives you just 64 networks. But before I go on, just how many network addresses do you need? Is it 500 or 4096?
Requirement - I need 1000 host address / 500 n/w address / 4096 n/w address ( 16.0.0.0 / 8 )

I can give you either, I think!!!
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