Robtex

Up: 203.19.8.0/22
Can't show all results, try to descend to a more specific CIDR
Down left: 203.19.10.0/24
Down right: 203.19.11.0/24
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
203.19.10.21	A+PTR	smtp.idx.com.au
203.19.10.25	PTR	maxb25.idx.com.au
203.19.10.25	A	mail.sefar.co.nz
203.19.11.1	PTR	tpg.lns-efm.idx.com.au
203.19.11.9	PTR	cp.idxhosting2.com.au
203.19.11.10	PTR	idxgs-10.static.idx.com.au
203.19.11.12	PTR	idxgs-12.static.idx.com.au
203.19.11.18	PTR	idxgs-18.static.idx.com.au
203.19.11.18	A	broadbandcity.com.au
203.19.11.22	PTR	idxgs-22.static.idx.com.au
203.19.11.22	A	flipbykes.com
203.19.11.23	A	dc-ed4392b3-mail.suertresresults.com
203.19.11.33	A+PTR	ns1.idxhosting.com.au
203.19.11.34	A	ns2.idxhosting.com.au
203.19.11.35	PTR	mail.idxhosting.com.au
203.19.11.35	A	mail.braganzaonline.com
203.19.11.36	PTR	colo-cp36.static.idx.com.au
203.19.11.37	PTR	mail2.idx.com.au
203.19.11.39	A+PTR	mail2.idx.com.au
203.19.11.44	PTR	idxgs-44.static.idx.com.au
203.19.11.47	PTR	idxgs-47.static.idx.com.au
203.19.11.47	A	ns1.broadbandcity.com.au
203.19.11.48	PTR	idxgs-48.static.idx.com.au
203.19.11.48	A	ns2.broadbandcity.com.au
203.19.11.49	PTR	idxgs-49.static.idx.com.au
203.19.11.49	A	mail.braganzaonline.com
203.19.11.49	A	mail.pscaudio.com
203.19.11.57	A+PTR	mail.idx.com.au
203.19.11.57	A	annoplan.idx.com.au
203.19.11.57	A	pop.idx.com.au
203.19.11.58	A+PTR	cp.idxhosting.com.au
203.19.11.58	A	mail.idxhosting.com.au
203.19.11.59	PTR	idxgs-59.static.idx.com.au
203.19.11.59	A	tripleplayhub.net
203.19.11.59	A	ns1.tripleplayhub.net
203.19.11.66	PTR	idxgs-66.static.idx.com.au
203.19.11.69	PTR	idxgs-69.static.idx.com.au
203.19.11.85	PTR	idxgs-85.static.idx.com.au
203.19.11.88	PTR	idxgs-88.static.idx.com.au
203.19.11.91	PTR	idxgs-91.static.idx.com.au
203.19.11.93	PTR	idxgs-93.static.idx.com.au
203.19.11.99	PTR	idxgs-99.static.idx.com.au
203.19.11.133	PTR	idxgs-133.static.idx.com.au
203.19.11.145	PTR	idxgs-145.static.idx.com.au
203.19.11.178	PTR	idxgs-178.static.idx.com.au
203.19.11.204	PTR	idxgs-204.static.idx.com.au
203.19.11.206	PTR	idxgs-206.static.idx.com.au