Robtex

Up: 103.20.16.0/22
Can't show all results, try to descend to a more specific CIDR
Down left: 103.20.18.0/24
Down right: 103.20.19.0/24
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
103.20.18.4	PTR	amta1.comms3.alterian.com
103.20.18.4	A	a.email6.westpac.com.au
103.20.18.4	A	a.email.bookmyshow.com
103.20.18.9	A+PTR	au-mail.em.sdlproducts.com
103.20.18.9	A	mail.ozsale.e.alterian.net
103.20.18.15	A	ozsale.e.alterian.net
103.20.18.16	A+PTR	ns3.alterianconnect.com
103.20.18.17	A+PTR	ns4.alterianconnect.com
103.20.18.72	A	au-ftp-uat.em.sdlproducts.com
103.20.18.154	A+PTR	amta4.email.mysale.my
103.20.18.203	A+PTR	amta2.email.mysale.co.uk
103.20.18.204	A	amta3.email.mysale.co.uk
103.20.18.209	A+PTR	amta1.email.caresuper.com.au
103.20.19.32	A+PTR	amta1.mail.identitydirect.com.au
103.20.19.46	A+PTR	amta4.email.ozsale.com.au
103.20.19.54	A+PTR	amta3.email.cocosa.co.uk
103.20.19.55	A+PTR	amta1.email7.westpac.com.au
103.20.19.130	A	amta2.mail.mylyf.com
103.20.19.165	A+PTR	amta1.email.mysale.my
103.20.19.168	A+PTR	amta1.email.singsale.com.sg
103.20.19.169	PTR	103_20_19_169.rdns.e.alterian.net
103.20.19.180	A+PTR	amta2.email8.westpac.com.au