================================================================
Overlap check: runA-100k vs runB-1m (rank <= 100,000)
================================================================
  runA-100k hosts:      100,000
  runB-1m hosts:      100,000
  Intersection:    43,976  (44.0% of smaller run)

  Hosts matched by hostname; comparison covers the
  intersection only.
  NOTE: Run A ams3 vantage was single-pass; see dataset docs. Host lists differ between runs (Mar CC list vs Apr-Jun ranks).

  category                         runA-100k       runB-1m     delta
  ------------------------------------------------------------------
  AAAA anywhere                       20,481        20,524       +43
  reachable from all                  19,334        19,356       +22
  partially reachable                    291           284        -7
  broken v6 everywhere                   445           460       +15
  dead (v4 too)                          411           424       +13
  geo-DNS divergent                    7,215         7,224        +9