Robtex

Up: 216.81.32.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 216.81.32.0/22
Down right: 216.81.36.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
216.81.32.74	PTR	ustx-bryan-mns-r-access1-fa-0-1-16.managednetworks.net
216.81.32.74	PTR	74.32.81.216.cyburdinehosting.com
216.81.32.75	PTR	75.32.81.216.cyburdinehosting.com
216.81.32.75	A	mail.emmauschurches.org
216.81.32.75	A	cbvfx.com
216.81.32.78	A	cbvfx.com
216.81.32.107	PTR	107.32.81.216.managednetworks.com
216.81.32.108	PTR	108.32.81.216.managednetworks.com
216.81.32.108	A	www.txdigital.com
216.81.32.113	PTR	113.32.81.216.managednetworks.com
216.81.32.122	PTR	122.32.81.216.managednetworks.com
216.81.32.129	A+PTR	ns1.centennialarts.com
216.81.32.130	A+PTR	ns2.centennialarts.com
216.81.32.131	A+PTR	www.centennialarts.com
216.81.32.133	A	smtp-relay1.centennialarts.com
216.81.32.136	A	smtp.centennialarts.com
216.81.32.137	PTR	www.cahosted.net
216.81.32.137	A	www.centennialarts.com
216.81.32.137	A	allaandm.com
216.81.35.216	A	mail.ballgage.com
216.81.35.223	A	ridgewood-village.com
216.81.35.226	A	mail.thundercomputersystems.com
216.81.36.6	A	server6.clusterweb.net
216.81.36.7	A	server7.clusterweb.net
216.81.36.10	PTR	ns1.gigabiz.net
216.81.36.10	A	ns1.wicksonwireless.com
216.81.36.11	PTR	server1.clusterweb.net
216.81.36.11	A	scanner.eptmail.com
216.81.36.11	A	scanner.wicksonwireless.com
216.81.36.18	PTR	bvdh2.bvdhosting.com
216.81.36.18	A	thecorkliquor.com
216.81.36.22	A	asterisk.clusterweb.net
216.81.36.23	A	inbound.clusterweb.net
216.81.36.24	A+PTR	outbound.clusterweb.net
216.81.36.33	A	radius1.pulkco.com
216.81.36.38	A	smartisd3.clusterweb.net
216.81.36.38	A	*.ebisd.org
216.81.36.51	A+PTR	mailman.clustermail.net
216.81.36.59	PTR	bvdh9.bvdhosting.com
216.81.36.59	A	bvdh2.bvdhosting.com
216.81.36.64	PTR	available
216.81.36.66	PTR	ap1.zingnet.net
216.81.36.67	PTR	ap1.zingnet.net
216.81.36.68	A	traffic.zingnet.net
216.81.36.170	A	cultistradio.com
216.81.36.170	A	raindogsguild.com
216.81.36.170	A	mail.cultistradio.com
216.81.38.7	A	mail2.alliantgroup.com
216.81.38.25	A	adfs.alliantgroup.com
216.81.39.35	A	wls-216-81-39-35.tconline.net
216.81.39.49	A	wls-216-81-39-49.tconline.net