Ip over sound

In the unicast world, each endpoint on the internet has a unique IP address assigned to it. This means that each of LinkedIn’s many PoPs (Points of Presence) has a unique IP address associated with it. DNS is then used to assign users to PoPs based on geographical location.

dig +short myip.opendns.com @resolver1.opendns.com

Retreive your ip info with a curl request

Ip over dns for public wifi
tuto: http://vincesafe.fr/2012/08/26/contournez-restrictions-et-censure-avec-lip-over-dns/