Robtex

Up: 203.126.16.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 203.126.16.0/23
Down right: 203.126.18.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
203.126.17.178	A	dns1-cy.i-phonenet.singtel.com
203.126.17.179	A	i-phonenet.singtel.com
203.126.17.179	A	ws.i-phonenet.singtel.com
203.126.17.182	A	ums2-cy.i-phonenet.singtel.com
203.126.17.186	A	ums1-cy.i-phonenet.singtel.com
203.126.17.194	A	dns1-oc.i-phonenet.singtel.com
203.126.17.197	A	i-phonenet.singtel.com
203.126.17.197	A	ws.i-phonenet.singtel.com
203.126.17.197	A	ws2-oc.i-phonenet.singtel.com
203.126.17.214	A	onemail.com.sg
203.126.18.70	A+PTR	mail.alfagomma.com.sg
203.126.18.70	A	mail.alfagomma.com.my
203.126.18.83	PTR	mail.ayala.com.sg
203.126.18.83	PTR	www.ayala.com.sg
203.126.18.83	A	mail.ayalaint.com
203.126.18.108	A	www.presidio.com.sg
203.126.18.110	A+PTR	mail.presidio.com.sg
203.126.18.116	A+PTR	mail1.ssmc.com
203.126.18.116	A	mail1.ssmc.com.sg
203.126.18.117	A+PTR	mail2.ssmc.com
203.126.18.117	A	mail2.ssmc.com.sg
203.126.18.164	PTR	mail.ricopl.com.sg
203.126.18.165	A	mail1.ricopl.com.sg
203.126.19.1	A	mail01.mncrewards.com
203.126.19.1	A	mail01.mncalacarte.com.sg
203.126.19.1	A	mail01.grandcopthorne.com.sg
203.126.19.148	A+PTR	ssc.cdac.org.sg
203.126.19.161	A	anden.co.th
203.126.19.221	A	wisgroup-eportal.com