Robtex

Up: 216.26.136.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 216.26.137.0/25
Down right: 216.26.137.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
216.26.137.4	PTR	ns1.teledvance.com
216.26.137.4	PTR	4.137.26.216.host.smoothstone.net
216.26.137.4	A	ns1.teledvance.net
216.26.137.11	A+PTR	mail0.smoothstone.com
216.26.137.11	A	mail.ellispark.net
216.26.137.11	A	mail.careyatlanta.com
216.26.137.12	A+PTR	db0.teledvance.com
216.26.137.12	PTR	12.137.26.216.host.smoothstone.net
216.26.137.12	A	smoothstone.net
216.26.137.20	PTR	ns2.teledvance.com
216.26.137.20	PTR	20.137.26.216.host.smoothstone.net
216.26.137.20	A	ns2.teledvance.net
216.26.137.130	PTR	mail.mflandtitle.com
216.26.137.130	A	mail.mooserlaw.com