Robtex

Up: 199.27.128.0/19
Can't show all results, try to descend to a more specific CIDR
Down left: 199.27.144.0/21
Down right: 199.27.152.0/21
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
199.27.144.4	A	vpntest.useractive.com
199.27.144.10	A	vpn.useractive.com
199.27.144.51	A	vpn.oreilly.com
199.27.144.59	A	www.learningwebdesign.com
199.27.144.74	A	cold.useractive.com
199.27.144.75	A+PTR	tepid.useractive.com
199.27.144.81	A	hottub3.useractive.com
199.27.144.82	A	hottub4.useractive.com
199.27.144.83	A	hottub.useractive.com
199.27.144.84	A	hottub2.useractive.com
199.27.144.101	A+PTR	cold1.useractive.com
199.27.144.104	PTR	oriole-prod2.oreilly.com
199.27.144.180	A	sink0.useractive.com
199.27.144.181	A	sink1.useractive.com
199.27.144.182	A	sink.useractive.com
199.27.144.186	A	fluentcon.com
199.27.144.187	A	fluentcon.com
199.27.144.240	A	esb.oreilly.com
199.27.144.241	A	esb.oreilly.com
199.27.145.51	A	ftp.oreilly.com
199.27.145.52	A	ftp.oreilly.co.jp
199.27.145.64	A	expectnation.com
199.27.145.64	A	oreillyanimals.com
199.27.145.64	A	missingmanual.com
199.27.145.65	A	expectnation.com
199.27.145.65	A	oreillyanimals.com
199.27.145.65	A	missingmanual.com
199.27.145.123	A	nsdb1.oreilly.com
199.27.146.72	PTR	vs2010.oreillyschool.com
199.27.146.72	A	pdu.useractive.com
199.27.146.80	A	server80.useractive.com
199.27.147.68	A+PTR	nano.oreillyschool.com
199.27.147.89	A	courses.oreillyschool.com
199.27.147.89	A	makingmath.com
199.27.147.89	A	blog.oreillyschool.com
199.27.147.104	A+PTR	tap-dev.oreillyschool.com
199.27.147.109	A+PTR	ellipse.oreillyschool.com
199.27.147.111	A	tap0.oreillyschool.com
199.27.147.116	A+PTR	tap.oreillyschool.com
199.27.147.117	A	jira.oreillyschool.com
199.27.147.171	A	lime.useractive.com
199.27.148.10	A+PTR	fizix.org
199.27.148.10	A	mirabellefarms.com
199.27.148.10	A	mail.fizix.org
199.27.148.11	A+PTR	hunka.net
199.27.148.29	A+PTR	www.userworld.com
199.27.148.29	A	www.useractive.com
199.27.148.29	A	userworld.com
199.27.148.37	A	zoku.me
199.27.148.40	A	triberapp.com
199.27.148.40	A	zokuapp.com
199.27.148.40	A	www.zokuapp.com
199.27.148.50	A	web98.userworld.com
199.27.148.51	A	web99.userworld.com
199.27.148.52	A	websl6.userworld.com
199.27.148.62	A+PTR	ns1.userworld.com
199.27.148.66	A+PTR	ns1.useractive.com
199.27.148.67	A+PTR	ns2.useractive.com
199.27.148.69	PTR	faucet.useractive.com
199.27.148.69	A	rockin.net
199.27.148.69	A	usersource.com
199.27.148.70	PTR	sink.useractive.com
199.27.148.87	A	faucet1.useractive.com
199.27.148.88	A+PTR	faucet0.useractive.com
199.27.148.89	A+PTR	www.rcad3dprint.com
199.27.148.89	A	rcad3dprint.com
199.27.148.119	A+PTR	fastdir.com
199.27.148.119	A	lb-fastdir.useractive.com
199.27.148.119	A	www.fastdir.com
199.27.149.11	PTR	ns1.useractive.com
199.27.149.12	PTR	ns2.useractive.com
199.27.150.108	A	sbco.ubervoip.net
199.27.150.109	A	ubervoice.ubervoip.net
199.27.150.109	A	uberconf.ubervoip.net
199.27.150.110	A	ubervoice.ubervoip.net
199.27.150.110	A	uberconf.ubervoip.net
199.27.150.123	A	ubervoice.ubervoip.net
199.27.150.123	A	uberconf.ubervoip.net
199.27.150.123	A	uvwss.ubervoip.net
199.27.150.147	A	uvwss.ubervoip.net
199.27.150.150	A	eqx-chi-erizo1.ubervoip.net
199.27.150.150	A	old-eqx-chi-erizo1.ubervoip.net
199.27.150.151	A	eqx-chi-erizo2.ubervoip.net
199.27.151.1	PTR	gw-skynetworks.useractive.com
199.27.152.10	A+PTR	mail.scfederal.org
199.27.154.2	A+PTR	ns2.connectfssonline.com
199.27.154.2	A	mail11.connectfssonline.com
199.27.154.2	A	ns2.jhfcu.net
199.27.154.3	PTR	ns2.connectfssonline.com
199.27.154.21	A	tegfcuolb.com
199.27.154.22	A	onlinebanking.tampabayfederal.com
199.27.154.24	A	olb.tvacreditunion.com
199.27.154.26	A	oao.tvacreditunion.com
199.27.156.34	A+PTR	ns1.delltelephone.com
199.27.156.34	A	ns2.dellcity.com
199.27.156.35	A+PTR	ns2.delltelephone.com
199.27.156.35	A	ns1.dellcity.com
199.27.156.130	A	system.dellcityisd.com
199.27.156.131	A+PTR	mail.dellcityisd.com
199.27.156.131	A	dellcityisd.com
199.27.156.131	A	dellcityisd.net