Linux:

[root@tjl-vm-linux]─[~] $ ping6 ipv6.google.com
PING ipv6.google.com(sea09s16-in-x0e.1e100.net) 56 data bytes
64 bytes from sea09s16-in-x0e.1e100.net: icmp_seq=1 ttl=255 time=23.5 ms
64 bytes from sea09s16-in-x0e.1e100.net: icmp_seq=2 ttl=255 time=22.3 ms
64 bytes from sea09s16-in-x0e.1e100.net: icmp_seq=3 ttl=255 time=22.3 ms
64 bytes from sea09s16-in-x0e.1e100.net: icmp_seq=4 ttl=255 time=22.3 ms
^C
--- ipv6.google.com ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3006ms
rtt min/avg/max/mdev = 22.305/22.628/23.514/0.533 ms
[root@tjl-vm-linux]─[~] $ curl -I https://ipv6.google.com
curl: (35) Unknown SSL protocol error in connection to ipv6.google.com:443

OS X:

[tjl@tjl-mbp]─[~] $ ping6 ipv6.google.com
PING6(56=40+8+8 bytes) 2620:10d:c082:1061:ae87:a3ff:fe38:ca06 --> 2607:f8b0:400a:803::200e
16 bytes from 2607:f8b0:400a:803::200e, icmp_seq=0 hlim=49 time=21.943 ms
16 bytes from 2607:f8b0:400a:803::200e, icmp_seq=1 hlim=49 time=21.957 ms
16 bytes from 2607:f8b0:400a:803::200e, icmp_seq=2 hlim=49 time=21.744 ms
^C
--- ipv6.l.google.com ping6 statistics ---
3 packets transmitted, 3 packets received, 0.0% packet loss
round-trip min/avg/max/std-dev = 21.744/21.881/21.957/0.097 ms

[tjl@tjl-mbp]─[~] $ curl -I https://ipv6.google.com
HTTP/1.1 200 OK