Gives out the public IP-Address for the local machine, that is recognized by the related master.
Usage:
dig +short myip.opendns.com @resolver1.opendns.com
#dig TXT +short o-o.myaddr.l.google.com @ns1.google.com
#host myip.opendns.com resolver1.opendns.com
#dig TXT +short o-o.myaddr.l.google.com @ns1.google.com | awk -F'"' '{ print $2}'
#curl ifconfig.me