If this is for RAC review the following MOS notes I had to do this in one of our 2 node cluster enviroments.
How to Modify Public or Private Network Information in Oracle Clusterware [ID 283684.1]
How to Modify Private Network Interface in 11.2 Grid Infrastructure [ID 1073502.1]
Modifying the VIP or VIP Hostname of a 10g or 11g Oracle Clusterware Node [ID 276434.1]
How to update the IP address of the SCAN VIP resources (ora.scan.vip) [ID 952903.1]
Thanks for the valuable answers.
is good, but is for Oracle 11g. I am working with Oracle 12.
Yet. from this link, there is a small change:
Oracle 11g: ./roothas.pl -delete -force or ./roothas.pl -delete
Oracle 12g: ./roothas.pl -deconfig -force or ./roothas.pl -deconfig
Hope this will also help other people :-)