Robtex

Up: 209.217.24.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 209.217.28.0/23
Down right: 209.217.30.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
209.217.28.2	A+PTR	aux-209-217-28-2.oklahoma.net
209.217.28.6	A+PTR	aux-209-217-28-6.oklahoma.net
209.217.28.16	A+PTR	aux-209-217-28-16.oklahoma.net
209.217.28.33	A+PTR	aux-209-217-28-33.oklahoma.net
209.217.28.47	A+PTR	aux-209-217-28-47.oklahoma.net
209.217.28.52	A+PTR	aux-209-217-28-52.oklahoma.net
209.217.28.70	A+PTR	aux-209-217-28-70.oklahoma.net
209.217.28.97	A+PTR	aux-209-217-28-97.oklahoma.net
209.217.28.106	A+PTR	aux-209-217-28-106.oklahoma.net
209.217.28.129	A+PTR	aux-209-217-28-129.oklahoma.net
209.217.28.137	A+PTR	aux-209-217-28-137.oklahoma.net
209.217.28.142	A+PTR	aux-209-217-28-142.oklahoma.net
209.217.28.166	A+PTR	aux-209-217-28-166.oklahoma.net
209.217.28.183	A+PTR	aux-209-217-28-183.oklahoma.net
209.217.28.192	A+PTR	aux-209-217-28-192.oklahoma.net
209.217.28.238	A+PTR	aux-209-217-28-238.oklahoma.net
209.217.28.242	A	aux-209-217-28-242.oklahoma.net
209.217.28.244	A+PTR	spamfilter.lsb-okc.com
209.217.28.244	A	mx1.iecokc.com
209.217.28.244	A	mx1.iec-okc.com
209.217.28.246	PTR	aux-209-217-28-246.oklahoma.net
209.217.28.252	A+PTR	aux-209-217-28-252.oklahoma.net
209.217.30.11	PTR	aux-209-217-30-11.oklahoma.net
209.217.30.11	A	mail.ikitimex.com
209.217.30.11	A	ns100.webhero.com
209.217.30.14	A	ns101.webhero.com
209.217.30.25	PTR	iecokc.com
209.217.30.25	A	mail.internationalenvironmental.com
209.217.30.50	PTR	aux-209-217-30-50.oklahoma.net
209.217.30.50	A	millionaireweekends.com
209.217.30.111	PTR	aux-209-217-30-111.oklahoma.net
209.217.30.111	A	bob.me