How to calculate the IP range when the IP address and the netmask is given?

by

my good friend Alessandro have a nice post regarding bit operators in C#, you should read about it so you know what to do.

It’s pretty easy. If you break down the IP given to you to binary, the network address is the ip address where all of the host bits (the 0’s in the subnet mask) are 0,and the last address, the broadcast address, is where all the host bits are 1.

For example:

ip 192.168.33.72 mask 255.255.255.192

11111111.11111111.11111111.11000000 (subnet mask)
11000000.10101000.00100001.01001000 (ip address)

The bolded parts is the HOST bits (the rest are network bits). If you turn all the host bits to 0 on the IP, you get the first possible IP:

11000000.10101000.00100001.01000000 (192.168.33.64)

If you turn all the host bits to 1’s, then you get the last possible IP (aka the broadcast address):

11000000.10101000.00100001.01111111 (192.168.33.127)

So for my example:

the network is "192.168.33.64/26":
Network address: 192.168.33.64
First usable: 192.168.33.65 (you can use the network address, but generally this is considered bad practice)
Last useable: 192.168.33.126
Broadcast address: 192.168.33.127

More Related Contents:

  1. How to convert an IPv4 address into a integer in C#?
  2. How do I access ARP-protocol information through .NET?
  3. What is IP address ‘::1’?
  4. how to change originating IP in HttpWebRequest
  5. Get All IP Addresses on Machine
  6. Getting all types that implement an interface
  7. How to remove all event handlers from an event
  8. Properties vs Methods
  9. Is there an easy way to create ordinals in C#?
  10. Do you have to put Task.Run in a method to make it async?
  11. C++ union in C#
  12. Using multiple versions of the same DLL
  13. Correct, idiomatic way to use custom editor templates with IEnumerable models in ASP.NET MVC
  14. Reading CSV files in C# [closed]
  15. Hide Tab Header on C# TabControl
  16. What is the default value of a member in an array?
  17. LINQ Inner-Join vs Left-Join
  18. Why is list when passed without ref to a function acting like passed with ref?
  19. Expression of type ‘System.Int32’ cannot be used for return type ‘System.Object’
  20. ASP.NET Core Identity – get current user
  21. ASP.NET File Upload
  22. Making an indexed control array?
  23. How do I extend a class with c# extension methods? [duplicate]
  24. How to get the comment from a .resx file entry
  25. Difference between .Net Core, Portable, Standard, Compact, UWP, and PCL?
  26. Open source C# code to present wave form?
  27. copy a class, C#
  28. C# tutorial to write gadgets
  29. How to implement Security Protocols TLS 1.2 in .Net 3.5 framework
  30. MVC 5.1 Razor DisplayFor not working with Enum DisplayName

Leave a Comment