Robtex

Up: 27.72.0.0/18
Can't show all results, try to descend to a more specific CIDR
Down left: 27.72.0.0/20
Down right: 27.72.16.0/20
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
27.72.0.0	PTR	localhost
27.72.0.138	PTR	localhost
27.72.0.244	PTR	localhost
27.72.1.20	PTR	localhost
27.72.1.20	A	mail01.agrivina.com
27.72.1.20	A	dalathasfarm.com
27.72.1.35	A	raovatdaknong.com
27.72.1.113	PTR	localhost
27.72.4.2	PTR	localhost
27.72.6.2	PTR	localhost
27.72.17.76	A	cknguyen.org
27.72.17.167	PTR	localhost
27.72.18.33	PTR	localhost
27.72.19.245	PTR	localhost
27.72.19.245	A	beautymonday.com
27.72.19.253	PTR	localhost
27.72.21.8	PTR	localhost
27.72.21.13	PTR	localhost
27.72.21.13	A	npmb.vn
27.72.21.13	A	nppmb.vn
27.72.21.34	A	mail.vicembutson.com.vn
27.72.21.135	PTR	dynamic-adsl.viettel.vn
27.72.22.37	PTR	dynamic-adsl.viettel.vn
27.72.22.37	A	xbqdnd.vn
27.72.23.66	A+PTR	mail.ancnc.vn
27.72.23.66	A	www.phuchoidata.com
27.72.23.66	A	mail.phuchoidata.com
27.72.23.70	A	ancnc.vn
27.72.26.63	PTR	localhost
27.72.28.111	A	www.adctopweb.com
27.72.28.111	A	quoctehanoi.edu.vn
27.72.28.219	PTR	localhost
27.72.28.219	A	hanoidigestivecenter.net
27.72.28.226	A	vgs.vn
27.72.29.41	PTR	dynamic-adsl.viettel.vn
27.72.29.41	A	en-cls.vn
27.72.29.108	PTR	localhost
27.72.29.180	A	ticketingnamthanh.com
27.72.29.180	A	tdev.tk
27.72.29.180	A	supportnamthanh.com
27.72.30.42	PTR	dynamic-adsl.viettel.vn
27.72.30.42	A	mail.landdecor.vn
27.72.30.182	A	iocorner.com
27.72.30.244	A	linhkientuancuong.com
27.72.30.244	A	www.machintuancuong.com
27.72.31.30	A	mail.amonir.com
27.72.31.30	A	amonir.com
27.72.31.96	A	phinvlabs.com
27.72.31.96	A	dlccomplexs.com
27.72.31.111	PTR	localhost
27.72.31.111	A	shopnonthoitrang.com
27.72.31.185	A	mail.phanbonquocgia.gov.vn
27.72.31.185	A	www.phanbonquocgia.gov.vn
27.72.31.185	A	phanbonquocgia.gov.vn