Robtex

Up: 210.18.240.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 210.18.240.0/22
Down right: 210.18.244.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
210.18.240.4	A+PTR	mx1.brennanit.net.au
210.18.240.4	A	mail.scalabrini.com.au
210.18.240.4	A	mx2.securetelecom.net.au
210.18.240.10	A+PTR	syd-mx-vip-01.brennanit.net.au
210.18.240.10	A	sm2-mx-vip-01.brennanit.net.au
210.18.240.14	PTR	mx3.brennanit.net.au
210.18.240.27	A	syd-milter-02.brennanit.net.au
210.18.240.28	A+PTR	syd-milter-03.brennanit.net.au
210.18.240.29	A	syd-milter-04.brennanit.net.au
210.18.240.30	A	mxrelay.brennanit.net.au
210.18.240.70	A	syd-mx-01.brennanit.net.au
210.18.240.71	A	syd-mx-02.brennanit.net.au
210.18.240.72	A+PTR	syd-mx-03.brennanit.net.au
210.18.240.73	A+PTR	syd-mx-04.brennanit.net.au
210.18.240.90	A	mxspool.brennanit.net.au
210.18.240.90	A	syd-mxspool-01.brennanit.net.au
210.18.240.91	A	mxspool.brennanit.net.au
210.18.240.91	A	syd-mxspool-02.brennanit.net.au
210.18.240.92	A	mxspool.brennanit.net.au
210.18.240.92	A	syd-mxspool-03.brennanit.net.au
210.18.240.132	A	syd-csm-01.brennanit.net.au
210.18.240.133	A	syd-pmxeui-01.brennanit.net.au
210.18.240.134	A+PTR	mx1.brennanit.net.au
210.18.240.134	A	mx.brennanit.net.au
210.18.240.137	A	mxfilternew.brennanit.net.au
210.18.240.140	A+PTR	bne-mx-vip-01.brennanit.net.au
210.18.240.140	A	sm2-mx-vip-01.brennanit.net.au
210.18.240.194	A	bne-mx-01.brennanit.net.au
210.18.240.195	A	bne-mx-02.brennanit.net.au
210.18.240.196	A	bne-mx-03.brennanit.net.au
210.18.240.220	A	csm.brennanit.net.au
210.18.240.226	A	mxspool.brennanit.net.au
210.18.240.227	A	mxspool.brennanit.net.au
210.18.240.227	A	bne-mxspool-02.brennanit.net.au
210.18.240.228	A	mxspool.brennanit.net.au
210.18.240.228	A	bne-mxspool-03.brennanit.net.au
210.18.243.4	PTR	akamai.brennanit.net.au
210.18.246.5	A	bne-sip-02.brennanit.net.au
210.18.246.60	A+PTR	sip-portal.brennanit.net.au