Please Whitelist This Site?

I know everyone hates ads. But please understand that I am providing premium content for free that takes hundreds of hours of time to research and write. I don't want to go to a pay-only model like some sites, but when more and more people block ads, I end up working for free. And I have a family to support, just like you. :)

If you like The TCP/IP Guide, please consider the download version. It's priced very economically and you can read all of it in a convenient format without ads.

If you want to use this site for free, I'd be grateful if you could add the site to the whitelist for Adblock. To do so, just open the Adblock menu and select "Disable on tcpipguide.com". Or go to the Tools menu and select "Adblock Plus Preferences...". Then click "Add Filter..." at the bottom, and add this string: "@@||tcpipguide.com^$document". Then just click OK.

Thanks for your understanding!

Sincerely, Charles Kozierok
Author and Publisher, The TCP/IP Guide


NOTE: Using software to mass-download the site degrades the server and is prohibited.
If you want to read The TCP/IP Guide offline, please consider licensing it. Thank you.

The Book is Here... and Now On Sale!

Searchable, convenient, complete TCP/IP information.
The TCP/IP Guide

Custom Search







Table Of Contents  The TCP/IP Guide
 9  TCP/IP Lower-Layer (Interface, Internet and Transport) Protocols (OSI Layers 2, 3 and 4)
      9  TCP/IP Internet Layer (OSI Network Layer) Protocols
           9  Internet Protocol (IP/IPv4, IPng/IPv6) and IP-Related Protocols (IP NAT, IPSec, Mobile IP)
                9  Internet Protocol Version 4 (IP, IPv4)
                     9  IP Addressing
                          9  IP Subnetting: Practical Subnet Design and Address Determination Example

Previous Topic/Section
IP Subnetting Step #4: Determining Subnet Identifiers and Subnet Addresses
Previous Page
Pages in Current Topic/Section
1
2
3
Next Page
IP Classless Addressing: Classless Inter-Domain Routing (CIDR) / "Supernetting"
Next Topic/Section

IP Subnetting Step #5: Determining Host Addresses For Each Subnet
(Page 2 of 3)

Class B Host Address Determination Example

We can do the same thing for our Class B network, naturally. The address of that network is 166.113.0.0. Now, say we want to define the hosts that go in subnet #13. We substitute 13 in binary (01101) for the subnet ID bits, to get the following subnet address, shown with the subnet ID bits highlighted and the host ID bits highlighted and underlined:

10100110 01110001 01101000 00000000

This is the subnet address 166.113.104.0. Now, we have 11 bits of host ID, so we can have a maximum of 2,046 hosts. The first is found by substituting “000 00000001” for the host ID bits”, to give an address of 166.113.104.1. The second host is 166.113.104.2, and so on. The last is found by substituting “111 11111110”, to give an address of 166.113.111.254. Note that since the host ID bits extend over two octets, two octets change as we increment the host ID, unlike our Class C example. The broadcast address is 166.113.111.255.

Key Concept: In a subnetted network, the address of host #H within subnet number #S is found by plugging in the binary value of S for the network’s subnet ID bits, and the binary value of H for subnet’s host ID bits.



Previous Topic/Section
IP Subnetting Step #4: Determining Subnet Identifiers and Subnet Addresses
Previous Page
Pages in Current Topic/Section
1
2
3
Next Page
IP Classless Addressing: Classless Inter-Domain Routing (CIDR) / "Supernetting"
Next Topic/Section

If you find The TCP/IP Guide useful, please consider making a small Paypal donation to help the site, using one of the buttons below. You can also donate a custom amount using the far right button (not less than $1 please, or PayPal gets most/all of your money!) In lieu of a larger donation, you may wish to consider purchasing a download license of The TCP/IP Guide. Thanks for your support!
Donate $2
Donate $5
Donate $10
Donate $20
Donate $30
Donate: $



Home - Table Of Contents - Contact Us

The TCP/IP Guide (http://www.TCPIPGuide.com)
Version 3.0 - Version Date: September 20, 2005

Copyright 2001-2005 Charles M. Kozierok. All Rights Reserved.
Not responsible for any loss resulting from the use of this site.