Robtex

Up: 216.208.8.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 216.208.8.0/23
Down right: 216.208.10.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
216.208.8.149	PTR	axxesslog.com
216.208.8.149	PTR	interadwes.com
216.208.8.149	PTR	qrxtech.com
216.208.10.46	PTR	host46.bellworld.ca
216.208.11.113	PTR	host-b113.bellworld.ca
216.208.11.201	PTR	host-b201.bellworld.ca