Hi,
Just for your information configure a vcenter using IP address is not a good idea. Always use a FQDN.
You can check this post Changing the IP of vCenter 5.1 | Virtual Potholes or this KB : VMware KB: Update vCenter Single Sign-On settings after you change the host name or port of the database server
or VMware KB: Re-pointing and re-registering VMware vCenter Server 5.1 / 5.5 and components
Hope It helps,
Regards,
Julien.