Gateway iP address after increasing network to /22

I am using /24 network now but i need to increase to /22 (255.255.252.0) in order to get more space for upcoming VOIP users and mobile users. But all of our servers are configured from 192.168.1.1 to 1.30 with the gateway of 192.168.1.254.

I have some doubt that after changing to /22 (192.168.0. to 192.168.3.254) network on watchguard XTM 5 router, i want to maintain all the servers to same ip address so what will be the gateway address? Can i still use 192.168.1.254 for all 3 segment like below?

Servers and printers IP address : 192.168.1.1 to 1.250
Gateway address : 192.168.1.254 /22

Static VOIP users : 192.168.0.1 to 1.200 Gateway address : 192.168.1.254 /22

DHCP users : 192.168.2.1 to 1.252 Gateway address : 192.168.1.254 /22

showroom static users : 192.168.3.1 to 1.100 Gateway address : 192.168.1.254 /22

Thank you so much in advance.

2 Answers

Any host address in a subnet can be used as the gateway address as long as you assign it to the router. The router is really just another host on the network.

Using a Windows 8/10 application from the Windows Store "IP Calculator" you can get some useful information:

• Entered IP: 192.168.0.1/22
  • IP Subnet: 192.168.0.0/22
• First Host: 192.168.0.1
  • Last Host: 192.168.3.254
• Total Hosts: 1022
• IP Mask: 255.255.252.0
• Broadcast IP: 192.168.3.255
• ACL Bitmask: 0.0.3.255
• Class C Bits 1-3 = 110
• Parent Subnets:
  • 192.168.0.0/21
  • 192.168.0.0/20