Robtex

Up: 205.172.0.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 205.172.0.0/23
Down right: 205.172.2.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
205.172.0.22	PTR	ms.inets.com
205.172.0.24	PTR	3i-marketing.com
205.172.0.24	PTR	www.3i-marketing.com
205.172.0.24	PTR	htdc.inets.com
205.172.0.62	A	wavonix14.wavonix.com
205.172.0.62	A	smtp.wavonix.com
205.172.0.130	PTR	vpn.islandatech.net
205.172.0.144	PTR	ppp144.hgea.org
205.172.0.200	PTR	www.cynthesys.biz
205.172.0.221	PTR	205_172_000_221.ymcahonolulu.org
205.172.1.81	PTR	test.drftest.com
205.172.1.94	A	jcidemo.com
205.172.1.227	A	cloud4u.us
205.172.1.248	A	pdcs-cloud.com
205.172.2.11	A	808ittech.com
205.172.2.13	A	filter.ip6switch.com
205.172.2.13	A	ip6switch.com
205.172.2.61	PTR	mx4.drfortress.com
205.172.2.75	PTR	hs1.koomohost.net
205.172.3.7	PTR	dns2.drfcloud.com
205.172.3.11	PTR	smtp2.inets.com
205.172.3.11	PTR	www.luxihawaii.com
205.172.3.11	PTR	www.nkwm.org
205.172.3.18	PTR	adamtest
205.172.3.32	PTR	atlashawaii.com
205.172.3.32	PTR	inets.com
205.172.3.32	PTR	islandacloud.com
205.172.3.50	PTR	luxihawaii.com
205.172.3.50	PTR	bishopco.net
205.172.3.50	PTR	webdevbk.inets.com
205.172.3.110	PTR	jamminhawaiianstyle.com
205.172.3.110	PTR	nagauelaw.com
205.172.3.110	PTR	windwardceramic.com
205.172.3.112	PTR	prymis.com
205.172.3.112	PTR	help.islandatech.com
205.172.3.120	A	mail.rqstars.com
205.172.3.204	A	mail.pdcsystems.com
205.172.3.204	A	mail.midashawaii.com
205.172.3.204	A	mail.csm-co.com
205.172.3.211	A+PTR	mx1.xenpost.com
205.172.3.211	A	scanner01.tikitechnologies.com
205.172.3.211	A	smtp.xenpost.com
205.172.3.212	A+PTR	mx2.xenpost.com
205.172.3.212	A	scanner01.tikitechnologies.com
205.172.3.212	A	smtp.xenpost.com
205.172.3.213	A	shadowcmd.pdcsystems.com