Unfortunately this happens to be a mandate without funding with the resulting low level of compliance:
said by The Register :--
US government websites will miss the deadline for transition to IPv6 on a huge scale, predicts a watchdog. Only 12 per cent of federal website domains are currently compatible with new internet protocol IPv6 according to the National institute of Standards and Technology. There are just two days to go before the deadline for compliance hits on Sunday.
Got some spare cpu cycles ? Join Team Helix or Team Starfire!