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Check this document.
How to Modify Public Network Information including VIP in Oracle Clusterware [ID 276434.1]
In that Document..
Changing public hostname
Public hostname is recorded in OCR, it is entered during installation phase. It can not be modified after the installation. >The only way to modify public hostname is by deleting the node, then add the node back with a new hostname, or >reinstall the clusterwarChanging public IP only without changing interface, subnet or netmask
If the change is only public IP address and the new ones are still in the same subnet, nothing needs to be done on >clusterware layer, all changes need to be done at OS layer to reflect the change.Note : Keep forum clean by marking "helpful" or "answered" if you question is answered
1. Shutdown Oracle Clusterware stack
2. Modify the IP address at network layer, DNS and /etc/hosts file to reflect the change
3. Restart Oracle Clusterware stack
Above change can be done in rolling fashion, eg: one node at a time.