For those of us who are subject to using corporate VPNs, all sorts of wackiness can occur such as
127.0.0.1 being routed first to another country before trying to resolve locally.
You can see both IPv4 and IPv6 routing entries by running
netstat -rn. Personally, I like to just show IPv4 addresses.
Here's an example of my route table with WiFi (and ethernet) interfaces disabled:
> netstat -nr -f inet
Destination Gateway Flags Netif Expire
127 127.0.0.1 UCS lo0
127.0.0.1 127.0.0.1 UH lo0
111.0.0 link#1 UmCS lo0
I've changed the last entry since I don't actually know if it's an internet work address.