Robtex

Up: 42.116.20.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 42.116.21.0/25
Down right: 42.116.21.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
42.116.21.4	PTR	mx03.stbtech.com.vn
42.116.21.6	PTR	mail.stbtech.asia
42.116.21.16	A	truyentranhso.com
42.116.21.16	A	estorepayment.com
42.116.21.16	A	trao.doi.phu.nu
42.116.21.69	PTR	mail2.eximbank.com.vn
42.116.21.75	A	eximbank.vn
42.116.21.210	A	phongcachsongmoi.vn
42.116.21.226	PTR	webmail.itechcorp.vn
42.116.21.226	PTR	mail.ittech.com.vn
42.116.21.226	PTR	webmail.ittech.com.vn
42.116.21.235	A	mail.anbangbeach.com
42.116.21.253	A	mail.vmcvn.com
42.116.21.253	A	vmcvn.com