Robtex

Up: 210.245.0.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 210.245.1.0/25
Down right: 210.245.1.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
210.245.1.65	A+PTR	mailgw01.fpt.com.vn
210.245.1.66	A+PTR	mailgw02.fpt.com.vn
210.245.1.67	PTR	mail.fpt.com.vn
210.245.1.67	A	webmail.fpt.com.vn
210.245.1.67	A	outlook.fpt.com.vn
210.245.1.253	PTR	north-dns01
210.245.1.254	PTR	north-dns02