Robtex

Up: 220.231.88.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 220.231.88.0/25
Down right: 220.231.88.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
220.231.88.21	PTR	localhost
220.231.88.21	A	mail.premierenglish.net
220.231.88.31	PTR	localhost
220.231.88.32	PTR	localhost
220.231.88.70	PTR	localhost
220.231.88.100	A+PTR	mail.generali-life.com.vn
220.231.88.107	PTR	localhost
220.231.88.107	A	genvita.vn
220.231.88.107	A	www.genvita.vn
220.231.88.109	A	vita-song-nhu-y.genvita.vn
220.231.88.110	A	mail.generalivietnam.com
220.231.88.115	PTR	localhost
220.231.88.115	A	genext.vn
220.231.88.115	A	www.genext.vn
220.231.88.116	PTR	localhost
220.231.88.117	PTR	localhost
220.231.88.117	A	genlink.generali-life.com.vn
220.231.88.119	PTR	localhost
220.231.88.119	A	ginquiry.generali-life.com.vn
220.231.88.120	A	cas.generali-life.com.vn
220.231.88.185	PTR	mail1.ajinomoto.com.vn
220.231.88.194	PTR	localhost
220.231.88.196	PTR	localhost
220.231.88.196	A	mail.tinhyeumongmo.vn
220.231.88.196	A	mail.mamnonbambi.edu.vn
220.231.88.198	PTR	localhost
220.231.88.198	A	ttcgroup.vn
220.231.88.203	PTR	localhost
220.231.88.203	A	danghuynh.vn
220.231.88.203	A	tanisugar.vn
220.231.88.205	PTR	mail.ttcland.vn
220.231.88.205	A+PTR	mail.yersin.edu.vn
220.231.88.205	PTR	mail.duongnuoctrong.vn
220.231.88.206	PTR	mail.attapeusugar.la
220.231.88.206	PTR	mail.toanhaivan.com.vn
220.231.88.206	PTR	mail.ttcplastic.vn
220.231.88.242	PTR	localhost
220.231.88.242	A	mail.thunglungtinhyeu.vn