Change Subnet mask in Windows 2012/SQL 2012 Always On Cluster

Hello,

We have a three node Windows 2012 cluster and it has SQL 2012 Always on configured on it. Three nodes have incorrect subnet mask values and we would like to change it.

Can anyone please provide the steps to change the subnet mask values ? i saw some blogs and they mention to shutdown or take the cluster offline and change the values as below but the roles in the cluster will still have the old subnet mask value after changing the values using below steps ? I'm kind of confused on how to change and its affect on the whole cluster as this is production.

Any help would be appreciated. Thanks in advance. 

Steps to change IP address/Subnet mask:

1. Go to Control Panel\All Control Panel Items\Network and Sharing Center\Change adapter settings\
2. Right-click Local Area Connection, and then click Properties.
3. In the Local Area Connection Properties dialog box, double-click Internet Protocol (TCP/IP).
4. In the Internet Protocol (TCP/IP) Properties dialog box, in the IP address box, type the new address.
5. In the Subnet mask box, type the subnet mask to 255.255.252.0