Subnet Mask -- leave STATIC IPs "as-is" ?

I already changed some of my static IP
clients to a 255.255.252.0 instead of
255.255.255.0 and they still work.
================================================
1) I assume I need to do this subnet change
on all STATICS (servers, switches, printers, etc)
before I do subnet change on my Windows DHCP server
and release/renew all DHCP clients ?

2) What happens if I SKIP this subnet
change on one of my STATICs by mistake ?

3) I assume the below is correct, getting
IPs in 192.168.24.x to 192.168.27.x ?
================================================
Current
  ** /24
  ** 255.255.255.0
  ** 254 usable IPs
  ** 192.168.24.x

Desired
  ** /22
  ** 255.255.252.0
  ** 1024 usable IPs
  ** 192.168.24.x
       to 192.168.27.x
finance_teacherAsked:
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rindiCommented:
Why don't you setup all your devices to get their IP's via DHCP, then reserve an IP address for those that need a static IP on your DHCP server? That way in future you don't need to go to each device and change things manually, and you don't risk assigning the same IP twice, everything is centrally managed and much easier to administrate.
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Dave BaldwinFixer of ProblemsCommented:
Since you have changed the 'broadcast address' they will listen to when you changed the mask, they won't always work.  I did that accidentally on one computer and just had mysterious random failures until I found it and fixed it.
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JustInCaseCommented:
1) I assume I need to do this subnet change
on all STATICS (servers, switches, printers, etc)
before I do subnet change on my Windows DHCP server
and release/renew all DHCP clients ?
Not quite. Most likely that devices will still be in the same network range, but it would be recommended way to do it. Subnet mask is just criteria to check are devices in the same IP range, if after checking subnet mask it is decided that devices are in the same network range, if mac address is not already known to device broadcast ARP is sent. If after check it is decided that devices are not in the same network - traffic for that device is sent to default gateway.
2) What happens if I SKIP this subnet
change on one of my STATICs by mistake ?
Devices that are not in the same IP range (with that device) will send traffic to default gateway since that device will believe that some devices are not in the same network range. For example server 192.168.0.1/24 client 192.168.2.255/22 -> client thinks that two hosts (server, client) are in the same network, server believes that two hosts (server, client) are in the different networks.
3) I assume the below is correct, getting
IPs in 192.168.24.x to 192.168.27.x ?
Yes, it is. 192.168.24.0/22 -> client range 192.168.24.1 -192.168.27.254
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