Robtex

Up: 216.21.224.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 216.21.224.0/23
Down right: 216.21.226.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
216.21.224.10	PTR	www.namebargain.com
216.21.224.34	PTR	download.register.com
216.21.224.119	A	ceto.to
216.21.224.125	A+PTR	mask01.register.com
216.21.224.126	A+PTR	mask02.register.com
216.21.224.129	A+PTR	atlmail01.galt.register.com
216.21.224.129	A	spf.webnames.ca
216.21.224.129	A	mail01.njeq.register.com
216.21.224.130	PTR	atlmail02.galt.register.com
216.21.224.130	A	mail02.njeq.register.com
216.21.224.154	PTR	ns2.register.com
216.21.224.155	PTR	ns4.register.com
216.21.224.172	A	sitebuilder.web.com
216.21.224.176	A+PTR	smtpc.register.com
216.21.224.188	A+PTR	mailgw.hosting.register.com
216.21.224.196	A	payconserve.com
216.21.224.197	A	parkmobileinternational.com
216.21.224.197	A	grahampallet.com
216.21.224.198	A	awattersforjustice.com
216.21.224.199	A	sitebuilder.web.com
216.21.224.200	A	*.hunkylads.com
216.21.224.200	A	*.my-glassesonline.com
216.21.224.200	A	10.ep-tech.co.uk
216.21.224.210	A	www.btdomainsaccount.com
216.21.224.210	A	btdomainsaccount.com
216.21.224.216	A	unlimitedlocalclicks.com
216.21.224.216	A	leadlogic.com
216.21.224.216	A	sprintsmgreports.com
216.21.224.220	A	smtp.register.com
216.21.224.220	A	smtpe.register.com
216.21.224.222	A	smartclickslocal.com
216.21.224.222	A	localadwords.net
216.21.224.239	A	briermere.com
216.21.225.17	PTR	pdns2.register.com
216.21.225.17	A	srv2-ascensia.ma
216.21.225.17	A	srv2-lasenzagirl.ma
216.21.225.18	PTR	dns02.ebrandsecure.net
216.21.225.19	PTR	ns2.netsearchers.com
216.21.225.20	PTR	dns2.cscdns.net
216.21.226.11	A+PTR	dns2.namebargain.com
216.21.226.12	A+PTR	dns4.namebargain.com
216.21.226.13	A+PTR	dns6.namebargain.com
216.21.226.14	A+PTR	dns8.namebargain.com
216.21.226.15	A+PTR	dns10.namebargain.com
216.21.226.16	A+PTR	dns12.namebargain.com
216.21.226.17	A+PTR	dns14.namebargain.com
216.21.226.18	A+PTR	dns16.namebargain.com
216.21.226.19	A+PTR	dns18.namebargain.com
216.21.226.20	A+PTR	dns20.namebargain.com
216.21.226.21	A+PTR	dns22.namebargain.com
216.21.226.22	A+PTR	dns24.namebargain.com
216.21.226.23	A+PTR	dns26.namebargain.com
216.21.226.24	A+PTR	dns28.namebargain.com
216.21.226.25	A+PTR	dns30.namebargain.com
216.21.226.26	A+PTR	dns32.namebargain.com
216.21.226.27	A+PTR	dns34.namebargain.com
216.21.226.28	A+PTR	dns36.namebargain.com
216.21.226.29	A+PTR	dns38.namebargain.com
216.21.226.30	A+PTR	dns40.namebargain.com
216.21.226.31	A+PTR	dns42.namebargain.com
216.21.226.32	A	dns2.dev.register.com
216.21.226.71	PTR	dns2.register.com
216.21.226.71	A	ns2.todaysitsolutions.net
216.21.226.71	A	ns2.baystonemediadns.com
216.21.226.72	A+PTR	dns4.register.com
216.21.226.73	A+PTR	dns6.register.com
216.21.226.73	A	*.philipmorris.ua
216.21.226.74	A+PTR	dns8.register.com
216.21.226.75	PTR	dns10.register.com
216.21.226.76	A+PTR	dns12.register.com
216.21.226.77	A+PTR	dns14.register.com
216.21.226.78	A+PTR	dns16.register.com
216.21.226.79	PTR	dns18.register.com
216.21.226.79	A	janko.org
216.21.226.80	A+PTR	dns20.register.com
216.21.226.81	A+PTR	dns22.register.com
216.21.226.81	A	planettile.com
216.21.226.82	A+PTR	dns24.register.com
216.21.226.83	PTR	dns26.register.com
216.21.226.84	A+PTR	dns28.register.com
216.21.226.85	A+PTR	dns30.register.com
216.21.226.85	A	collymore.ro
216.21.226.86	PTR	dns32.register.com
216.21.226.86	A	srv2-marboro-calassics.ma
216.21.226.87	PTR	dns34.register.com
216.21.226.88	A+PTR	dns36.register.com
216.21.226.88	A	festner.net
216.21.226.89	A+PTR	dns38.register.com
216.21.226.90	A+PTR	dns40.register.com
216.21.226.91	PTR	dns42.register.com
216.21.226.97	A	dns4.dev.register.com
216.21.226.101	A+PTR	dns44.register.com
216.21.226.102	A+PTR	dns46.register.com
216.21.227.10	A	*.bbc-law.net
216.21.227.17	PTR	pdns1.register.com
216.21.227.17	A	srv1-ascencia.ma
216.21.227.17	A	srv1-ascensia.ma
216.21.227.18	PTR	dns01.ebrandsecure.net
216.21.227.19	PTR	ns1.netsearchers.com
216.21.227.20	PTR	dns1.cscdns.net
216.21.227.50	A	support.web.com
216.21.227.50	A	help.web.com
216.21.227.57	A	www.techsupport.interland.com
216.21.227.57	A	support.interland.com
216.21.227.61	A	perfectprivacy.com
216.21.227.61	A	ca.web.com
216.21.227.61	A	www.perfectprivacy.com
216.21.227.84	A	www.logoyes.com
216.21.227.86	A	web.com