IP Subnet Calculator - Networks And CIDR (Mask)
Feb 5, 2010
I need test data for a IP Subnet calculator I have developed. I have tested some obvious scenarios, and all seems good, but the person developing can often be the wrong person to test.
The calculator can do one of two things:
1 - Given an existing network and CIDR (mask), and a new CIDR it will create a number of networks with the appropriate number of hosts.
2 - Given an existing network and CIDR (mask), and a list of c,h, (c = count, h=number of hosts) it will create the networks.
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Oct 26, 2009
How can I convert a subnetmask into binary, so I'll end up with 32 digits? I can convert it into Binary, using Convert.ToString(Long-to-convert, 2). But a subnetmask of 255.255.255.0 returns(it returns it without the spaces though):
1111 1111 1111 1111 1111 1111 0
When I want it to be:
1111 1111 1111 1111 1111 1111 0000 0000
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Nov 27, 2009
How can I convert a subnetmask into binary, so I'll end up with 32 digits?I can convert it into Binary, using Convert.ToString(Long-to-convert, 2)But a subnetmask of 255.255.255.0 returns(it returns it without the spaces though):
1111 1111 1111 1111 1111 1111 0
When I want it to be:
1111 1111 1111 1111 1111 1111 0000 0000
[code].....
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Aug 24, 2011
I am trying to verify that I have a valid subnet mask. I have already verified that the string format 255.255.255.0 or whatever 255.255.240.0 converts to a UInt32 but now I need to make sure its actually a subnet mask.
The bits should be split between 1's for the network part and 0's for the host part. It should start with all 1's and end in all 0's if it goes from 1's to 0's then finds any more 1's its an invalid subnet mask.
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Sep 24, 2011
As part of my application I am hoping to be able to get the user to enter their IP address and subnet mask which will then enumerate all of the hosts in between which can then be scanned for various open ports/applications installed.
For instance, With a network of 10.91.100.0/255.255.255.252 hosts are valid 10.91.100.1 - .2
How can this be done in vb.net? I would assume also some error checking would need to be put in place to confirm as to whether the subnet mask was valid as well?
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Feb 5, 2010
I need test data for a IP Subnet calculator I have developed. I have tested some obvious scenarios, and all seems good, but the person developing can often be the wrong person to test. The calculator can do one of two things:
1 - given an existing network and CIDR(mask), and a new CIDR it will create a number of networks with the appropriate number of hosts.
2 - given an existing network and CIDR(mask), and a list of c,h, (c = count, h=number of hosts) it will create the networks.
View 5 Replies
Feb 5, 2010
I need test data for a IP Subnet calculator I have developed. I have tested some obvious scenarios, and all seems good, but the person developing can often be the wrong person to test.
The calculator can do one of two things:
1 - given an existing network and CIDR(mask), and a new CIDR it will create a number of networks with the appropriate number of hosts.
2 - given an existing network and CIDR(mask), and a list of c,h, (c = count, h=number of hosts) it will create the networks.
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Mar 8, 2009
Can anyone point me to some code which can help obtain the network address from the host IP and subnet mask?
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Jan 8, 2010
im wondering how to make a program that will detect the WiFi Networks in range and i can connnect to one,
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Aug 14, 2010
I have a matrix for example (10 x 10) which represents 10 nodes. The matrix called MyMat(9,9) The rows of this matrix represent the source node (From Node) and the columns represents target node (To Node). It has 14 links which are randomly distributed. The non zero values represent the connections between nodes.
[Code]...
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Mar 6, 2009
my ip is 10.10.10.66 my subnet mask is 255.255.255.0 want to get all other computers ip address?
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Feb 23, 2010
I am working on a video chat program and I have almost everything working on my network I now need to figure out how to establish comunication between two clients from diffrent networks without having a middle person to switch each meassage to each other.
To clarify: I belive that I need to have a server running that each client when they start up the program will login to the server handing thier external ipaddress and port forward to get to each respective client, this will be stored in a SQL database (I know how to add the data just not hwo to get it from the source)
Then the server would brodcast the clients name to anyone that is authorized to know (currently everyone) and has there data stored on the server.Finnaly when the client shouts down it sends out the logging-off comand and deletes the adressing information from the server.The client programs will be windows form applications that use the tcpclient connection to send text meassage And the server application will be I hope a webapp.
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Oct 27, 2009
I have a form with two listboxes. The user selected the directory using a FolderBrowserDialog1 then my program searches the directory and displays a list of files. They them select the files they want to store under a project name and the names are placed in a database. My problem is it stores the mapped file path not the network path. (ie N:examples estfile.txt I need \myserverexamples estfiles.txt) That is because the person that reads this database may not have their network drives mapped to the same letters.
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Jan 6, 2011
I am working on an application that collects data from PCs on the network using WMI queries. Is there any sample code that knowing the subnet would autodiscover PCs nearby?
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Jun 8, 2011
I have a folder on my server(windows 2003) that I would like to copy to all computers running Windows XP on a particular subnet.
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Oct 13, 2010
I am using VB 2008 and doing the project on office 2007. I've created a Ribbon (Visual Designer) and put a button. Now thats all I've done. I'm still researching on how to make it so that when I press the button , a box will appear and at the side of the box will be something like" Search, Stop, Select, Cancel" buttons the box will be a container where when search is pressed, the wireless/LAN connections will be displayed.
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Jun 14, 2009
there anyway to retrieve the SSID of the network the pc's currently connected to or the list of available networks? I've googled for examples, but I only find vb.net 2005 examples that don't work in vb.net 2008
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Jun 28, 2010
i need a way to find the current SSID of the connected network as there are different settings for the two networks.
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Apr 29, 2011
I would like to create my own application that will simply discover the wireless networks in the area, similar to how the wireless card software works. I don't really know where to start, except with maybe the System.Net namespace.
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Apr 1, 2012
For a drop down combo box, if you place 0 as a custom mask, you can enter only numbers. If you place A as the custom mask, you can enter letters and numbers. How can I make it so that you can enter only letters?
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Dec 1, 2008
I'm having trouble getting a masked textbox to properly store a date. I'm using the short date format 00/00/0000 but when I navigate to a record that only has a single digit date it displays incorrectly.eg. 12/01/2008 displays as 12/12/008_Surely there's a fix for this but I'm not finding it.
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Jun 4, 2010
I have been using the following code to find files within a directory with a specific mask, without any problems except windows 7 platforms.
The Folder searched contains five(5) word documents with a .dotx extension
The following mask is being used:
"*.doc", "*.docx", "*.dot", "*.dotx", "*.pdf"
The search returns me ten(10) files as the *.doc mask returns the *.docx files too.
How can I get this to work on old windows platforms as well as Windows 7 with the same mask?
Dim
lFiles As
New List(Of
[Code]......
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Jan 8, 2009
I'm in MS Access 2003. I inherited a form with a text box. The text box has the following input mask. !(900") "000-0000;0; Here are my issues.
1. If the form is opened and I click in the text box at a point that is not leftmost, the cursor may not be placed at the leftmost position. Sometimes, it gets stuck at some point in the displayed mask. If I click in an empty text box, I always want the cursor to be leftmost. How can I create that behavior ?
2. If I get the cursor in the leftmost position of the text box and try to paste in phone numbers in certain formats, some of the input gets chopped off. ex: 555 555 5555, becomes (555) 555-{cursor} 555-555-5555 becomes (555) {cursor} IMHO, these formats are common enough that I would want a mask to accept it. Can I make the mask more general ?
3. What is the meaning of leading !, the double quotes, and the semi-colons?
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Jun 20, 2009
I am trying to Mask Employee ID, so the user doesn't have to type the entire employee ID number CCETA01. I want them to type only two digit numbers. e.g. 01 to 99...
Here what I did but its not working:I draged from toolbox a Maskedtextbox on the Form and in the textbox progerties I put cce a. The entire number show up on my textbox pretty good but it does not allow me to change the two digit numeric number?
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Aug 10, 2009
There are a number of textboxes I would like to validate. I first set up the key press events to only allow key entry's of characters which I feel are valid for this location (i.e. numbers and "." for dollar amounts). But in addition to this I would also like to ensure that the user entered something valid using an input mask. This may be a simple question but I couldn't seem to find the answer to it. If I have a input mask of ###.## and the user enters something like 4321.23, would this throw an error and if so, how should I set up my mask large enough so the user is able to enter large amounts.
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Jul 13, 2011
Here is the
Option Strict On
Dim mask As ULong = &HFFFFFFFFUL
Dim result1 As ULong = 20L And mask '//disallows implicit conversions
Dim result2 As ULong = 20L And &HFFFFFFFFUL
If you put that into the IDE with Option Strict On, it will not let you compile because of 'result1'. I'm not sure I understand why. In the 'result2' assignment, I am explicitly saying to use an unsigned long, however it's not giving me any grief.
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May 8, 2009
I have a data in combobox which is "2003010420030117", and the data is from datasource.
How do I make it look like " 2003/01/04 - 2003/01/17"?
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Apr 18, 2012
I've come across code in a library that I want to use that I have never seen before (probably because I don't use c# all that much) and can't find any documentation on. It doesn't work in VB.NET and I'm not even sure of what it does so that I could go about doing it some different way. The expression is Mask.NullString(str).Length. Can anyone help me out please?
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Sep 16, 2010
I am creating an application where the user inputs must be restricted. Of course, the MaskedTextBox control provides the basic functionality for this, allowing me to set up a fixed input-string length, include literals if desired, etc. However, in some instances the available input-character types (digits, alphanumeric, etc.) are not sufficient to provide the restriction I require.
For example, in one field the user enters a hexadecimal number, i.e., composed of only characters [0-9][A-F], but there is no option in the default masking language for that. It would be nice to be able to add a couple masking elements, such as H and h for required and optional hex digit respectively. For now, I just check the Text contents of the MaskedTextBox after each TextChanged event and warn the user/remove the offending character(s), but I would prefer to be able to customize the Mask.
Is there any straightforward (or even not straightforward) way to accomplish this? For example, by creating a custom MaskedTextProvider? If so, how would I go about it?
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Mar 31, 2011
I have a need to apply a mask to a string programmatically and not through any type of Masked Edit Control. So for example a mask of (###) ###-#### would need to be applied to a string such as 5551234567 to create (555) 123-4567.
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