Robtex

Up: 27.72.16.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 27.72.16.0/22
Down right: 27.72.20.0/22

IP	Type	Hostname
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