Robtex

Up: 173.234.16.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 173.234.16.0/22
Down right: 173.234.20.0/22

IP	Type	Hostname
173.234.16.10	A	byfreeproxy.com
173.234.16.10	A	mail.anonymizer-proxy.com
173.234.16.11	A	mail.proxy-buy.com
173.234.16.11	A	mail.camgigs.com
173.234.16.19	A	vpn.dfw.witopia.net
173.234.16.19	A	vpn.dallas.witopia.net
173.234.16.35	A	vpn.dfw.witopia.net
173.234.16.35	A	vpn.dallas.witopia.net
173.234.16.67	A	vpn.dfw.witopia.net
173.234.16.67	A	vpn.dallas.witopia.net
173.234.16.122	PTR	waraya.critiquelab.com
173.234.16.200	PTR	nhvserver.dayservers.net
173.234.19.15	A	pbjiu.com
173.234.19.51	PTR	favourite.offerfindersite.com
173.234.19.51	A	sjpd.net
173.234.19.68	A	mx.dascobv.com
173.234.19.83	PTR	actor.offerfindersite.com
173.234.19.135	A	www.gztiyu.com
173.234.19.163	A	chinalingjing.com
173.234.19.176	A	salzhelmreich.eu
173.234.19.176	A	yintongda.com
173.234.19.216	A	315898.com
173.234.19.228	A	zjsideli.com
173.234.19.229	A	mjnongye.com
173.234.19.240	A	ruidian8.com
173.234.19.242	PTR	town.offerfindersite.com
173.234.20.120	PTR	173.234.20.120.rdns.as15003.net
173.234.21.12	PTR	173-234-21-12.vdsl.packetip.net
173.234.21.20	A	7mzqbfw.com
173.234.21.92	A	bet365zxtywz.com
173.234.21.131	A	hg777tz.com
173.234.21.200	A	xyhdxjqp.com
173.234.21.226	PTR	173-234-21-226.vdsl.packetip.net
173.234.23.2	PTR	173.234.23.2.rdns.as15003.net