setting an input mask for an IP address in asp.net

Question

I am writing an application which involves users entering in IP addresses in the following format: "198.109.234.250"

I am using an ajax control at the minute that creates the mask like this: _ _ . _ . _ . _ _ which is fine because it will not allow letters to be entered just numbers.

Here is my question:

How do i set the maximum value for each three digit section of the I.P? like so that the maximum for each section can only be 250? like this: 250.250.250.250

I have been looking for an attribute within the ajax extender but cant seem to find one.

Which control are you using?

John Saunders
– John Saunders

2013-08-13 18:59:11 +00:00
Commented Aug 13, 2013 at 18:59 — John Saunders
– John Saunders, Commented Aug 13, 2013 at 18:59

Win · Accepted Answer · 2013-08-13 15:43:07Z

2

I'm not a regular expression expert, but you can use RegularExpressionValidator for validating IP Address.

For example,

<asp:TextBox runat="server" ID="IPAddressTextBox" />
<asp:RegularExpressionValidator 
    ID="RegularExpressionValidator1" 
    runat="server"
    ValidationExpression="\b(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\b"
    ControlToValidate="IPAddressTextBox" 
    Text="IP Address must in format - 255.255.255.255"
    Display="Dynamic" />

answered Aug 13, 2013 at 15:43

Win

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