Daily domain changes across all indexed zones. New domains gained a nameserver in a zone that day after having none — flagged first appearance if we have never seen the domain delegated before, or seen before if it returned after previously existing (e.g. re-registered). Removed domains lost their last nameserver and dropped out of their zone. Moved domains stayed delegated but changed their nameservers, whether moving to another provider or adding or dropping some.
The same daily changes for nameserver glue records; the badge shows the address family of the changed record.
The same daily changes for the addresses that nameserver glue points at. Only first-ever sightings are listed here: addresses we had never seen in any zone's glue before this day. The rest of the day's new addresses were already in our data and simply picked up another nameserver.