Robtex

Up: 109.68.64.0/22
Can't show all results, try to descend to a more specific CIDR
Down left: 109.68.64.0/24
Down right: 109.68.65.0/24
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
109.68.64.4	A+PTR	cenfw1.emailcenteruk.com
109.68.64.5	A+PTR	cenfw2.emailcenteruk.com
109.68.64.6	PTR	centro.emailcenteruk.com
109.68.64.7	A+PTR	cenhost1.emailcenteruk.com
109.68.64.8	A	cenmxm5app2.emailcenteruk.com
109.68.64.10	A+PTR	mxm.mxmfb.com
109.68.64.10	A	mail.gardenhealth.com
109.68.64.10	A	mail.onthemarket.com
109.68.64.11	PTR	cenmxmpmta1.emailcenteruk.com
109.68.64.13	A+PTR	cenmxmpmta2.emailcenteruk.com
109.68.64.14	A+PTR	cenmxmpmta3.emailcenteruk.com
109.68.64.16	PTR	testing.maxemail.emailcenteruk.com
109.68.64.21	A+PTR	log.emailcenteruk.com
109.68.64.21	A	mailfilter.emailcenteruk.com
109.68.64.22	A+PTR	seeding.emailcenteruk.com
109.68.64.24	A+PTR	validation.emailcenteruk.com
109.68.64.25	PTR	monitor.emailcenteruk.com
109.68.64.26	A+PTR	alchemetrics-dev.emailcenteruk.com
109.68.64.27	A	mail.emailcenteruk.com
109.68.64.27	A	zimbra.emailcenteruk.com
109.68.64.28	A+PTR	contribute.emailcenteruk.com
109.68.64.28	A	c.emcsrv.com
109.68.64.28	A	mcdonalds.c.emcsrv.com
109.68.64.29	A	www.emailcenteruk.net
109.68.64.30	A+PTR	files.emailcenteruk.com
109.68.64.31	A+PTR	maxemailode.emailcenteruk.net
109.68.64.32	A+PTR	maxautomation.emailcenteruk.com
109.68.64.33	A+PTR	testing.maxemail.emailcenteruk.com
109.68.64.35	A+PTR	clientservices.emailcenteruk.com
109.68.64.37	PTR	emccds01.emailcenteruk.com
109.68.64.40	A+PTR	maxemail.emailcenteruk.com
109.68.64.40	A	link.johnstonpress.co.uk
109.68.64.40	A	email.wynsors.com
109.68.64.41	PTR	client.jarrang.com
109.68.64.42	PTR	ivcmail.intelligentvc.co.uk
109.68.64.42	A	intelligentvc.maxemail.emailcenteruk.com
109.68.64.43	A+PTR	connection2.emailcenteruk.com
109.68.64.44	PTR	email.media.co.uk
109.68.64.44	A	mediaco.maxemail.emailcenteruk.com
109.68.64.45	PTR	broadcast.mailingtank.com
109.68.64.46	PTR	users.imailshot.co.uk
109.68.64.46	A	imailshot.maxemail.emailcenteruk.com
109.68.64.47	A+PTR	trx.mxmfb.com
109.68.64.48	PTR	magentodem.emailcenteruk.com
109.68.64.49	PTR	optimics.maxemail.emailcenteruk.com
109.68.64.50	A+PTR	affinitynewmedia.maxemail.emailcenteruk.com
109.68.64.51	A+PTR	mailchoice.saga.co.uk
109.68.64.52	PTR	maxemailbeta.emailcenteruk.com
109.68.64.54	PTR	wp.emailcenteruk.com
109.68.64.100	PTR	brocadeec.connection2.com
109.68.64.101	PTR	brocadeec.connection2.com
109.68.64.102	PTR	connection2.emailcenteruk.com
109.68.64.103	PTR	connection2.emailcenteruk.com
109.68.64.104	PTR	broadcast.mailingtank.com
109.68.64.105	PTR	broadcast.mailingtank.com
109.68.64.106	PTR	mediaco.maxemail.emailcenteruk.com
109.68.64.107	PTR	mediaco.maxemail.emailcenteruk.com
109.68.64.254	A	centro.emailcenteruk.com
109.68.65.7	A	mta657.mxmfb.com
109.68.65.9	PTR	mta659.mxmfb.com
109.68.65.17	A	mta6517.mxmfb.com
109.68.65.36	A	mta6536.mxmfb.com
109.68.65.44	A+PTR	mta6544.mxmfb.com
109.68.65.45	A	mta6545.mxmfb.com
109.68.65.47	A+PTR	mta6547.mxmfb.com
109.68.65.47	A	spf.pearson.com
109.68.65.48	A+PTR	mta6548.mxmfb.com
109.68.65.48	A	spf.pearson.com
109.68.65.51	A+PTR	mta6551.mxmfb.com
109.68.65.52	A+PTR	mta6552.mxmfb.com
109.68.65.57	A	mta6557.mxmfb.com
109.68.65.68	A	mta6568.mxmfb.com
109.68.65.72	A+PTR	mta6572.mxmfb.com
109.68.65.79	A	mta6579.mxmfb.com
109.68.65.83	A	mta6583.mxmfb.com
109.68.65.85	A	mta6585.mxmfb.com
109.68.65.87	A	mta6587.mxmfb.com
109.68.65.89	A+PTR	mta6589.mxmfb.com
109.68.65.99	A+PTR	mta6599.mxmfb.com
109.68.65.107	A	mta65107.mxmfb.com
109.68.65.109	A+PTR	mta65109.mxmfb.com
109.68.65.116	A	mta65116.mxmfb.com
109.68.65.120	A+PTR	mta65120.mxmfb.com
109.68.65.121	A	mta65121.mxmfb.com
109.68.65.131	A	mta65131.mxmfb.com
109.68.65.151	A	mta65151.mxmfb.com
109.68.65.157	A+PTR	mta65157.mxmfb.com
109.68.65.159	A+PTR	mta65159.mxmfb.com
109.68.65.175	A	mta65175.mxmfb.com
109.68.65.207	A+PTR	mta65207.mxmfb.com
109.68.65.208	A+PTR	mta65208.mxmfb.com
109.68.65.223	A	mta65223.mxmfb.com
109.68.65.232	A+PTR	mta65232.mxmfb.com
109.68.65.248	A	mta65248.mxmfb.com
109.68.65.250	A+PTR	mta65250.mxmfb.com