This American Registry for Internet Numbers (ARIN) web page provides guidelines to help ensure successful introduction of AAAA records and IPv6 support into your DNS infrastructure.
This report prepared June, 2020, details the Domain Name System (DNS) IPv6-only support status of United States government and military domains.
Here’s the current status of IPv6 DNS from top to bottom:
. (root) - All 13 root servers in .root-servers.net allow native IPv6 queries. G is on the Sensitive but Unclassified Internet Protocol Data (SBU IP Data) service, formerly known as NIPRNet. H is on the Defense Research and Engineering Network (DREN). AAAA records deployment in the root hints file began on 4 February 2008. For a current list of the root servers' IPv6 addresses, see www.root-servers.org.
*. - There are almost 1600 Top-Level Domains (TLDs) around the world. Over 98% of them have AAAA records in the DNS root server zone files, and are reachable via IPv6. Most of them are foreign countries, but COM, EDU, GOV, INFO, NET, and ORG are among them. This Hurricane Electric web page provides status reports for over 1200 generic TLDs (gTLDs) around the world. For up-to-date status of all TLDs, look at the Global IPv6 Deployment Progress Report also maintained by Hurricane Electric.
com - All thirteen .com name servers support native IPv6 queries and have AAAA records.
edu - All thirteen .edu name servers supports native IPv6 queries and have AAAA records.
gov - All four .gov name servers support native IPv6 queries and have AAAA records.
info - All six .info name servers support native IPv6 queries and have AAAA records.
mil - All six .mil name servers support native IPv6 queries and have AAAA records.
*.army.mil - As of April, 2008, the Army's DNS architecture was updated to support AAAA records. AAAA records may be added by special request to the Army 2nd Regional Cyber Center (2RCC) DNS team.
net - same name servers as .com.
org – All six .org name servers support native IPv6 queries and have AAAA records.
arpa – all twelve name servers (A thru I and K thru M, while J is not an authoritative name server for .arpa) have AAAA records. 11 of the 12 name servers support native IPv6 queries (C does not). See Internet Engineering Task Force (IETF) Best Current Practices (BCP 155) also known as Request for Comments (RFC) 5855 Nameservers for IPv4 and IPv6 Reverse Zones.
in-addr.arpa - same as arpa.
ip6.arpa - this zone has been delegated to five non-root name servers (ns2.lacnic.net, sec1.apnic.net, ns-sec.ripe.net, tinnie.arin.net, and ns.icann.org) per the IETF in Appendix A of RFC 5855. All five name servers allow native IPv6 queries and have AAAA records.
NOTE for implementers: The DNS entries to use with IPv6 are AAAA and IP6.ARPA. The other candidates (A6 and IP6.INT) have been deprecated, A6 by RFC 6563 in 2012 and IP6.INT by RFC 4159 in 2005.