Hi NANOG, I'm looking for some information on the four largest US mobile phone carriers and the current state of their IPv6 infrastructure. Specifically, we are trying to figure out: 1. How much of the carrier core and edge for AT&T, Verizon. T-Mobile, and Sprint are on IPv6 now? 2. If, and how, are they handling NAT64 for native IPv6 edge devices? 3. What is the percentage of breakdown for users on native IPv6? Dual stacked? GREE is a mobile social gaming company and we're trying to better understand what lies between our customer's smart phones and our servers. My next step will be to reach out to the carriers themselves, but I figured many of their Network Engineers are probably on the NANOG mailing list and this would be a great place to start. Thanks in advance for your time and assistance. Sincerely, - Paul Porter -- *Paul G. Porter *GREE International | Network Engineer CCNP, CCSP, JNCIS-FWV, JNCIA-Junos E-mail: paul.porter@gree.net Mobile: (510) 371-1147 Twitter: paul_g_porter