CAIDA ARK DNS Names
“This public dataset contains all IPv4 measurements from Archipelago (Ark) that are older than approximately one year, and all IPv6 measurements (upto the present).”
…
“The IPv4 Routed /24 DNS Names Dataset provides fully-qualified domain names for IP addresses seen in the traces of the IPv4 Routed /24 Topology Dataset.
“DNS names are useful for obtaining additional information about routers and hosts making up the Internet topology. For example, DNS names of routers often encode the link type (backbone vs. access), link capacity, Point of Presence (PoP), and geographic location. We have DNS Names data starting March 2008.”