Robtex

Up: 27.72.40.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 27.72.44.0/23
Down right: 27.72.46.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
27.72.44.113	PTR	localhost
27.72.45.173	PTR	localhost
27.72.45.221	PTR	dynamic-ip-adsl.viettel.vn
27.72.46.135	PTR	localhost
27.72.46.142	A	tudonghoathaibinh.com
27.72.46.142	A	truongchinhtrithaibinh.edu.vn
27.72.46.142	A	mttq.thaibinh.gov.vn
27.72.46.177	A	2k3.world-mu.net
27.72.47.138	PTR	localhost