Robtex

Up: 171.244.64.0/18
Can't show all results, try to descend to a more specific CIDR
Down left: 171.244.64.0/20
Down right: 171.244.80.0/20
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
171.244.67.12	PTR	dynamic-ip-adsl.viettel.vn
171.244.72.3	A	mail.cameramanhtuan.com
171.244.72.3	A	thucphamsachhiennhuan.com
171.244.72.3	A	mail.rausachthanhhoa.com
171.244.80.14	PTR	dynamic-ip-adsl.viettel.vn