Robtex

Up: 216.247.96.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 216.247.104.0/22
Down right: 216.247.108.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
216.247.104.111	PTR	mail.beliefnet.com
216.247.104.114	PTR	mail.greenwish.com
216.247.104.162	PTR	mail.parrotsoftware.com
216.247.105.76	PTR	mail.cardozoschool.org
216.247.105.158	PTR	mail.voorsanger.com
216.247.106.7	A	mail.matthewmendelsohn.com
216.247.106.30	PTR	mail.ecoll.net
216.247.106.30	PTR	mail.ecolumbia.net
216.247.106.52	PTR	mail.tzan.com
216.247.106.62	A	mail.osagebow.com
216.247.106.66	PTR	mail.big-planet.com
216.247.106.136	PTR	mail.radiodubs.com
216.247.106.144	PTR	mail.eondirect.com
216.247.106.156	A	mail.aschome.com
216.247.106.197	PTR	mail.warwick-new-york.com
216.247.106.208	PTR	mail.nodzine.com
216.247.106.212	A	mail.berstalerts.com
216.247.106.212	A	mail.berst-alerts.com
216.247.106.212	A	mail.berst-alert.com
216.247.106.218	A	mail.advstr.com
216.247.107.100	PTR	mail.hdbiz.com
216.247.107.107	PTR	mail.kurtadam.com
216.247.107.107	PTR	mail.lolitalar.com
216.247.107.107	PTR	mail.minicik.com
216.247.107.161	A	mail.armitageshanks.com.sa
216.247.107.161	A	mail.alnajran.com.sa
216.247.107.164	PTR	mail.nutty.com
216.247.107.164	A	mail.nuttycompany.com
216.247.107.166	PTR	mail.littlesprouts.com
216.247.108.15	PTR	mail.adshoppe.com
216.247.108.28	PTR	mail.rainbowdepot.com
216.247.108.53	PTR	mail.ohmsoftware.com
216.247.108.54	PTR	mail.infosummary.com
216.247.108.118	A	mail.sasys.net
216.247.108.118	A	mail.southernassociates.net
216.247.108.118	A	mail.jmichalko.net
216.247.108.133	PTR	mail.iaview.com
216.247.108.133	PTR	mail.internextmall.com
216.247.108.178	PTR	mail.kidspeech.com
216.247.108.242	PTR	mail.kidsdesk.com
216.247.109.74	PTR	mail.cnn.com
216.247.109.74	PTR	mail.lastdayofschool.com
216.247.109.74	PTR	mail.testregister.com
216.247.109.225	PTR	mail.n-i-c.com
216.247.109.234	PTR	mail.fait.net
216.247.110.41	PTR	mail.myforesight.com
216.247.110.126	PTR	mail.flury.com
216.247.110.232	PTR	mail.jointventure.org
216.247.111.20	PTR	mail.ie-group.com
216.247.111.75	PTR	mail.cornerstonechurchofgod.org
216.247.111.131	PTR	mail.awesomestyles.com
216.247.111.148	PTR	mail.kesslermusic.com
216.247.111.156	PTR	mail.replacementlighting.com
216.247.111.166	PTR	mail.dotyhench.com
216.247.111.178	PTR	mail.mrpeeves.com
216.247.111.178	PTR	mail.petpeeves-2000.com
216.247.111.178	PTR	mail.petpeeves-online.com