When you access bla.com a DNS (which is usually your ISP dns) will convert bla.com into whatever the DNS points to, it does not matter where you are. Unless you make an internal DNS entry for example in etc/hosts making it point to some other IP address.
The question is what IP are you getting when your outside with ping bla.com and what IP when your at home.
The question is what IP are you getting when your outside with ping bla.com and what IP when your at home.