Validating IP address

Question

I need to validate an IP address through a Develop 6i Forms application.
Rules are:
1. w.x.y.z where w, x, y and Z between 0-255
2. Their has to be a valid format
of type w.x.y.z where w,x,y and z
are all integers.
Are there any built-in functions to perform such checks. If any one has created such a
function, can you share the information.
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Answer 1

OK... I'm not getting drawn into a war on this. I will just point out that RFC790 is about Assigned Numbers and doesn't say how an IP address MUST be formatted. It does mention that IP addresses are 32 bits long and divided into network and local portions. It then goes on to say:
One notation for internet host addresses commonly used divides the 32-bit address into four 8-bit fields and specifies the value of each field as a decimal number with the fields separated by periods. For example, the internet address of ISIF is 010.020.000.052.
This notation will be used in the listing of assigned network numbers.
Notice that this is just one common notation and is the one that they select to represent address on the Assigned Numbers list.