Using an IP range as a conditional

[Newsgroup_User]

I would like to show one set of links to our users who are inside our
network and a different set to those outside our network. We have an IP
range from 192.168.0.0 - 192.168.255.255. I am capturing the IP address of
the visitor using CGI.REMOTE_ADDR.

How can I compare the captured IP address to evaluate if it is GTE
192.168.0.0 AND LTE 192.168.255.255?

[Newsgroup_User]

Just break the ip into its parts

<cfset testIP = "192.168.125.12">

<cfif listGetAt(testIP,1) EQ 192 AND
listGetAt(testIP,2) EQ 168 AND
(listGetAt(testIP,3) GTE 0 AND listGetAt(testIP,3) LTE 255) AND
(listGetAt(testIP,4) GTE 0 AND listGetAt(testIP,4) LTE 255)>
Do whatever
<cfelse>
Do something else
</cfif>

For your particular example you really only need to check that the first
two parts equal 192 and 168, but this provides the full functionality.

[Newsgroup_User]

Oops, didn't provide the proper syntax for the listGetAt function.

You need to use this form: listGetAt(testIP,1,".")

[Dan_Bracuk]

<cfif theip gte "192.168.0.0" and theip lte "192.168.255.255">

Plus some other code in case the user is not providing their ip address.

[Newsgroup_User]

On Wed, 14 Feb 2007 12:16:49 -0500, Wally Kolcz wrote:

> I would like to show one set of links to our users who are inside our
> network and a different set to those outside our network. We have an IP
> range from 192.168.0.0 - 192.168.255.255. I am capturing the IP address of
> the visitor using CGI.REMOTE_ADDR.
>
> How can I compare the captured IP address to evaluate if it is GTE
> 192.168.0.0 AND LTE 192.168.255.255?

if (reFind("192\.168\.[0-9]{1,3}\.[0-9]{1,3}", CGI.REMOTE_ADDR)

That regex will not an IP address, per-se, as it'll match stuff like
192.168.999.999, but the web server will only pass valid IP addies, so that
part of the validation is already done.

This'll only work for complete 0-255 0-255 ranges on the last two bytes,
but that meets your stated requirement.

--
Adam