If a new host takes over an IP address it should announce it with a Gratuitous ARP. You said some hosts didn't pick it up because they were not connected, but that's not how it works. If those hosts were not connected, they shouldn't have an ARP table in the first place.
Address Resolution Protocol (ARP) is a procedure for mapping a dynamic Internet Protocol address to a permanent physical machine address in a local area network.The physical machine address is also known as a Media Access Control or MAC address. The job of the ARP is essentially to translate 32-bit addresses to 48-bit addresses and vice-versa.

Nov 20, 2018 If you'd rather update the values themselves, select the range with MAC addresses and run the following macro (which uses the FormatMAC function): Sub FormatMACSelection Dim rng As Range Application.ScreenUpdating = False For Each rng In Selection rng.Value = FormatMAC(rng.Value) Next rng Application.ScreenUpdating = True End Sub.

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If you use a lot of VBA codes like me then you need to have a place where you can store all of them and use them whenever you need.

But the question is, what’s the best place for this? PERSONAL MACRO WORKBOOK. Yes, that PERSONAL.XLBS workbook. Here’s the crazy thing:

Creating a personal macro workbook and storing all the important macros in it can save you a ton of time and help you use them in all Excel files.

Isn’t that AWESOME?? And today in this post, I’ll be sharing with you everything you need to know about this file. So stay with me for the next 3 to 4 minutes.

How to Create a Personal Macro Workbook in Excel

Can I Share My Personal Macro Workbook with Others?

What is PERSONAL MACRO WORKBOOK

Personal Macro Workbook is a file which can be the common storage place to store your all macros and use them. Although it’s a hidden file which opens when you start Excel in your system. And you don’t need to open it separately when you want to access any of the codes from it. All the codes from it can be seen in your macro list.

What’s the LOCATION of PERSONAL.XLSB Workbook

Here’s the bad news: Even though it’s such a useful thing to have, it’s not there in Excel by default, so you need to create it (I’ve shared the steps ahead in this post). But, you can check if it is already created or not.

The first method is to open your visual basic editor and if your project window you have listed a “PERSONAL.XLBS” named file.

Where Are Mac Addresses Stored For Future Reference

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Where Are Mac Addresses Stored For Future Reference