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Today's network measurements rely heavily on Internet-wide scanning,employing tools like ZMap that are capable of quickly iterating over the entireIPv4 address space. Unfortunately, IPv6's vast address space poses anexistential threat for Internet-wide scans and traditional network measurementtechniques. To address this reality, efforts are underway to develop``hitlists'' of known-active IPv6 addresses to reduce the search space forwould-be scanners. As a result, there is an inexorable push for constructing aslarge and complete a hitlist as possible.  This paper asks: what are the potential benefits and harms when IPv6 hitlistsgrow larger? To answer this question, we obtain the largest IPv6 active-addresslist to date: 7.9 billion addresses, 898 times larger than the currentstate-of-the-art hitlist. Although our list is not comprehensive, it is asignificant step forward and provides a glimpse into the type of analysespossible with more complete hitlists.  We compare our dataset to prior IPv6 hitlists and show both benefits anddangers. The benefits include improved insight into client devices (priordatasets consist primarily of routers), outage detection, IPv6 roll-out,previously unknown aliased networks, and address assignment strategies. Thedangers, unfortunately, are severe: we expose widespread instances of addressesthat permit user tracking and device geolocation, and a dearth of firewalls inhome networks. We discuss ethics and security guidelines to ensure a safe pathtowards more complete hitlists.

IPv6 Hitlists at Scale: Be Careful What You Wish For