Robtex

Up: 72.21.40.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 72.21.40.0/23
Down right: 72.21.42.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
72.21.40.28	A	mail.nuyouthantiaging.com
72.21.40.28	A	nuyouthantiaging.com
72.21.40.29	PTR	40.21.72.in-addr.arpa
72.21.40.29	A	mail.nuyouthantiwrinkle.com
72.21.40.29	A	nuyouthantiwrinkle.com
72.21.40.70	A	cofcoagrigrain.com
72.21.40.74	A	agrofoyer.nl
72.21.40.74	A	*.agrofoyer.nl
72.21.40.82	PTR	82.40.21.72.ns1.cpweb.co.uk
72.21.40.82	A	ilston.com
72.21.40.87	PTR	87.40.21.72.static.reverse.ltdomains.com
72.21.40.190	PTR	190.40.21.72.static.reverse.ltdomains.com
72.21.40.218	A	tech2b.com
72.21.41.2	A	eros-atlas.de
72.21.41.2	A	finalcrew.com
72.21.41.2	A	www.final-order.org
72.21.41.3	PTR	3.41.21.72.static.reverse.ltdomains.com
72.21.41.11	PTR	11.41.21.72.static.reverse.ltdomains.com
72.21.41.69	PTR	69.41.21.72.static.reverse.ltdomains.com
72.21.41.69	A	ns2.goldy4host.com
72.21.41.70	PTR	70.41.21.72.static.reverse.ltdomains.com
72.21.41.70	A	ns1.goldy4host.com
72.21.41.98	PTR	mail.vxn.ca
72.21.41.130	A	ns1.reserveja.com.br
72.21.41.144	PTR	144.41.21.72.static.reverse.ltdomains.com
72.21.41.144	A	mypedigree.ca
72.21.41.147	A	cesar.com.mx
72.21.41.150	A	whiskas.sk
72.21.41.154	A	mail.slapcast.com
72.21.41.169	PTR	169.41.21.72.static.reverse.ltdomains.com
72.21.41.170	PTR	170.41.21.72.static.reverse.ltdomains.com
72.21.41.171	PTR	171.41.21.72.static.reverse.ltdomains.com
72.21.41.172	PTR	172.41.21.72.static.reverse.ltdomains.com
72.21.41.173	PTR	173.41.21.72.static.reverse.ltdomains.com
72.21.41.174	PTR	174.41.21.72.static.reverse.ltdomains.com
72.21.41.202	PTR	202.41.21.72.static.reverse.ltdomains.com
72.21.41.224	A	garciniadiettotal.com
72.21.41.224	A	mail.garciniadiettotal.com
72.21.41.225	A	auraleipurityserum.com
72.21.41.225	A	mail.auraleipurityserum.com
72.21.41.240	PTR	240.41.21.72.static.reverse.ltdomains.com
72.21.42.16	A	whiskas.lv
72.21.42.17	A	whiskas.lt
72.21.42.18	PTR	www.value-cgi.net
72.21.42.19	PTR	host1.value-cgi.net
72.21.42.19	A	catsan.it
72.21.42.20	PTR	host2.value-cgi.net
72.21.42.20	A	elaintenpaiva.fi
72.21.42.20	A	maailmanelaintenpaiva.fi
72.21.42.21	PTR	host3.value-cgi.net
72.21.42.21	A	whiskas.ua
72.21.42.23	A	marschocolatedrinksandtreats.com
72.21.42.30	PTR	30.42.21.72.static.reverse.ltdomains.com
72.21.42.30	A	whiskas.lu
72.21.42.30	A	actie.snickers.nl
72.21.42.32	PTR	32.42.21.72.static.reverse.ltdomains.com
72.21.42.36	A	ns2.7pe.net
72.21.42.37	A	aquarian.co.uk
72.21.42.38	A	m-ms.hu
72.21.42.41	PTR	41.42.21.72.static.reverse.ltdomains.com
72.21.42.41	A	initiativezahngesundheit.de
72.21.42.42	A	eukanuba.pr
72.21.42.42	A	eukanuba.com.mx
72.21.42.43	PTR	sphinx.adsen.com
72.21.42.45	PTR	chimera.adsen.com
72.21.42.45	A	snickers.sk
72.21.42.49	A	skittleswin.com
72.21.42.50	A	pondcare.net
72.21.42.50	A	apiaquarium.com
72.21.42.50	A	pond-care.com
72.21.42.52	A	jeuwhiskas.fr
72.21.42.53	A	medaillepersonnalisee.com
72.21.42.54	PTR	54.42.21.72.static.reverse.ltdomains.com
72.21.42.54	A	www.pedigree.pt
72.21.42.56	PTR	56.42.21.72.static.reverse.ltdomains.com
72.21.42.56	A	whiskas.nl
72.21.42.57	A	hund-fragen-wissen.de
72.21.42.58	A	abccachorro.com
72.21.42.65	PTR	65.42.21.72.static.reverse.ltdomains.com
72.21.42.82	A	mail.cheap-phentermine-4u.com
72.21.42.82	A	mail.fayetteday.com
72.21.42.82	A	mail.spanam.net
72.21.42.84	A	mail.kcby.org
72.21.42.84	A	mail.clanhaggis.com
72.21.42.104	A	www.group.bmj.com
72.21.42.104	A	bmjgroup.com
72.21.42.104	A	eso-cdn.group.bmj.com
72.21.42.108	A	ratingwidget.services.bmj.com
72.21.42.114	A	ftp.dpipe.bmjgroup.com
72.21.42.121	PTR	121.42.21.72.static.reverse.ltdomains.com
72.21.42.177	A	milionposilkow.pl
72.21.42.180	A	juicyfruitjingle.ca
72.21.42.182	A	www.mars-graduates.kz
72.21.42.242	A+PTR	search4-3.lon2.prod.sli-systems.net
72.21.43.49	A	napigw3.dev.cosocloud.com
72.21.43.65	PTR	65.43.21.72.static.reverse.ltdomains.com
72.21.43.65	A	sheba.nl
72.21.43.66	A	sheba.de
72.21.43.66	A	dns3.ax-hosting.com
72.21.43.67	A+PTR	dns4.ax-hosting.com
72.21.43.68	PTR	68.43.21.72.static.reverse.ltdomains.com
72.21.43.68	A	whiskas.be
72.21.43.68	A	www.whiskas.be
72.21.43.69	A	www.whiskas.ch
72.21.43.70	PTR	70.43.21.72.static.reverse.ltdomains.com
72.21.43.70	A	www.whiskas.co.uk
72.21.43.72	A	www.whiskas.hu
72.21.43.72	A	whiskas.hu
72.21.43.73	PTR	73.43.21.72.static.reverse.ltdomains.com
72.21.43.73	A	whiskas.me
72.21.43.75	PTR	75.43.21.72.static.reverse.ltdomains.com
72.21.43.75	A	whiskas.ca
72.21.43.77	PTR	77.43.21.72.static.reverse.ltdomains.com
72.21.43.77	A	pedigree.ch
72.21.43.79	PTR	79.43.21.72.static.reverse.ltdomains.com
72.21.43.90	PTR	ns1.serverffc.com
72.21.43.96	PTR	96.43.21.72.static.reverse.ltdomains.com
72.21.43.96	A	m-ms.com.hr
72.21.43.96	A	m-ms.rs
72.21.43.114	A	strategiesforchroniccare.com
72.21.43.114	A	morethanscleroderma.ca
72.21.43.124	A	snickers-srbija.com
72.21.43.188	PTR	ns1.femme.com.br
72.21.43.189	A	winwithsnickers.com
72.21.43.192	A	healthyfitnessclub.com
72.21.43.192	A	mail.healthyfitnessclub.com
72.21.43.193	A	mail.completecleanseplus.com
72.21.43.193	A	completecleanseplus.com
72.21.43.195	PTR	195.43.21.72.static.reverse.ltdomains.com
72.21.43.240	A	whiskas.co.uk
72.21.43.241	PTR	241.43.21.72.static.reverse.ltdomains.com
72.21.43.241	A	www.whiskas.pl
72.21.43.241	A	whiskas.pl
72.21.43.242	PTR	rome.fluidata.com
72.21.43.242	A	sheba.ch
72.21.43.244	PTR	admin.fluidata.com
72.21.43.244	A	sheba.be
72.21.43.247	PTR	247.43.21.72.static.reverse.ltdomains.com
72.21.43.247	A	sheba.cz
72.21.43.249	PTR	249.43.21.72.static.reverse.ltdomains.com
72.21.43.249	A	sheba.hu
72.21.43.250	A	dreamies-snacks.ch
72.21.43.252	PTR	252.43.21.72.static.reverse.ltdomains.com
72.21.43.252	A	perfect-fit.at
72.21.43.253	PTR	253.43.21.72.static.reverse.ltdomains.com
72.21.43.253	A	pedigree.it
72.21.43.254	PTR	254.43.21.72.static.reverse.ltdomains.com
72.21.43.254	A	sheba.at