How to replace existing DHCP Scope with a new one?

Okay, so I konw there are a gazillion "how to change DHCP scope" questions but I just want to confirm the network affects of creating new scope that replaces an existing one.
So here is what i understand. In order to extend my DHCP range i have delete the existing scope and create a new scope with same IP range (different subnet mask)
Steps:
1. Delete the old scope with subnet mask 255.255.255.0
2. Create a new scope with subnet mask 255.255.254.0

So how long does it take the network to "recover" from this change?
In the mean time does the network stop working?
the network has to be working by Monday AM

thank you
ronfastI.T. DirectorAsked:
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motnahp00Commented:
It will really depend on your lease duration.

I would run the following each DHCP client to ensure that it is reflecting the new scope configuration:

ipconfig /release & ipconfig /renew
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ronfastI.T. DirectorAuthor Commented:
oh yeah. great point I should have thought of that. THis is the first time I've done this and it makes me nervous when I delete network stuff.
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motnahp00Commented:
Understood. Good luck with your new configuration.

Out of curiosity, why are you requesting the question to be closed versus answered?
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ronfastI.T. DirectorAuthor Commented:
Oh no. I didn't mean a request to close. Arg. Not intentional.
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ronfastI.T. DirectorAuthor Commented:
One more question. All of my servers have 255.255.255.0 mask do i change all of those as well or just the DHCP mask
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motnahp00Commented:
As long they are DHCP recipients, the scope will take care of them.
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ronfastI.T. DirectorAuthor Commented:
thank you so much!! I took the plunge and all the clients are getting the IPs.

yay
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motnahp00Commented:
You're welcome. Good luck.
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ronfastI.T. DirectorAuthor Commented:
Okay, so i'm sorry one more question.
When you have the new subnet mask., the first IP addressed are 192.168.100.53-.254
When it fills that range what will the new IPs look like?
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motnahp00Commented:
Sorry, but subnet masking is definitely not one of my strengths.
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ronfastI.T. DirectorAuthor Commented:
there was a DHCP calculator on a website that i used.
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