nyc3:
  hosts in both passes:        1,000,000
  hosts in one pass only:             0
  AAAA presence flips:            5,373
  v6 transient (flipped once):    2,024  (up 1,079 / down 945)
  v6 failed both passes:         25,209
sfo3:
  hosts in both passes:        1,000,000
  hosts in one pass only:             0
  AAAA presence flips:            4,897
  v6 transient (flipped once):    1,694  (up 920 / down 774)
  v6 failed both passes:         24,648
ams3:
  hosts in both passes:        1,000,000
  hosts in one pass only:             0
  AAAA presence flips:            4,921
  v6 transient (flipped once):    2,246  (up 1,316 / down 930)
  v6 failed both passes:         24,274
sgp1:
  hosts in both passes:        1,000,000
  hosts in one pass only:             0
  AAAA presence flips:            5,422
  v6 transient (flipped once):    2,163  (up 1,054 / down 1,109)
  v6 failed both passes:         27,101
ca-tunnel:
  hosts in both passes:        1,000,000
  hosts in one pass only:             0
  AAAA presence flips:            2,896
  v6 transient (flipped once):    1,684  (up 974 / down 710)
  v6 failed both passes:         22,583