Robtex

Up: 203.117.28.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 203.117.28.0/25
Down right: 203.117.28.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
203.117.28.6	PTR	mx.ri.edu.sg
203.117.28.6	A	mx.ri.sch.edu.sg
203.117.28.14	A	blogs.ri.sch.edu.sg
203.117.28.212	A+PTR	mail.ifastfinancial.com
203.117.28.212	A	mail.facompliance.com
203.117.28.212	A	mail.ifastfinancial.co.in