Find your LAN/WAN/DHCP addresses

#get WAN address
dig +short myip.opendns.com @resolver1.opendns.com

#get DHCP server address(es)...
cat /var/lib/dhcp/dhclient*leases \
| awk '/dhcp-server/ {print $3}' | uniq | sed 's/;//'

#get IP[v4] address(es)...
ip a | awk '/inet/ {print $2}' | grep -v "127.0\|::"
  #  remove the "::" if you also want your IPv6 address(es)