Robtex

Up: 199.48.48.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 199.48.52.0/23
Down right: 199.48.54.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
199.48.52.99	A	dal-sbc.voip.arena1.com
199.48.52.150	PTR	dal-wwwshared-1.arena1.com
199.48.52.150	A	soastedit.com
199.48.52.150	A	williampatrickwriter.com
199.48.52.250	A+PTR	ns2.arena1.com
199.48.52.251	A	ns4.arena1.com