@marcelloc:
Check linezing.com ip address and then start a tcpdump from console listening on lan for traffic on this ip
This won't work because OpenDNS is blocking the resolution of that name and hence you'll never get any traffic sent there.
Kind of ugly but functional way to find this from tcpdump:
tcpdump -ni em0 port 53 |grep linezing.com
replacing em0 with your LAN NIC. Let that run until you see some output. That'll catch any DNS request for *.linezing.com