Robtex

Up: 69.56.0.0/19
Can't show all results, try to descend to a more specific CIDR
Down left: 69.56.16.0/21
Down right: 69.56.24.0/21
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
69.56.16.2	A	mta.skylist.com
69.56.18.25	A	mail1.email.carnegiecomm.com
69.56.18.26	A	mail2.email.carnegiecomm.com
69.56.18.27	A	mail3.email.carnegiecomm.com
69.56.18.28	A	mail4.email.carnegiecomm.com
69.56.18.32	A	members.alloystudentoffers.com
69.56.18.33	A	mail1.members.alloystudentoffers.com
69.56.18.34	A	mail2.members.alloystudentoffers.com
69.56.18.35	A	mail3.members.alloystudentoffers.com
69.56.18.48	PTR	click1.members.collegexpress.com
69.56.18.48	A	members.collegexpress.com
69.56.18.49	PTR	mail1.members.collegexpress.com
69.56.18.50	PTR	mail2.members.collegexpress.com
69.56.18.51	PTR	mail3.members.collegexpress.com
69.56.18.52	A	mail4.members.collegexpress.com
69.56.18.55	A	mail7.members.collegexpress.com
69.56.19.16	A	webmail.members.vault.com
69.56.19.16	A	click1.members.vault.com
69.56.19.16	A	members.vault.com
69.56.19.32	A	careerinsider-news.vault.com
69.56.19.34	A	mail2.careerinsider-news.vault.com
69.56.19.40	A	email.infobaselearning.com
69.56.19.43	A	mail3.email.infobaselearning.com
69.56.20.8	A+PTR	mail1.newsletters.wnd.com
69.56.20.9	A+PTR	mail2.newsletters.wnd.com
69.56.20.10	A+PTR	mail3.newsletters.wnd.com
69.56.20.11	A	mail4.newsletters.wnd.com
69.56.20.176	A	gclexpertsnews.com
69.56.20.177	A+PTR	mail1.gclexpertsnews.com
69.56.20.178	A	mail2.gclexpertsnews.com
69.56.20.179	A+PTR	mail3.gclexpertsnews.com
69.56.20.192	PTR	click1.usafismembersclub.com
69.56.20.192	A	hostmaster.usafismembersclub.com
69.56.20.192	A	*.usafismembersclub.com
69.56.20.193	PTR	mail1.usafismembersclub.com
69.56.20.194	PTR	mail2.usafismembersclub.com
69.56.20.195	PTR	mail3.usafismembersclub.com
69.56.20.229	A	mail1.iwon-updates.com
69.56.20.242	A	mail6.excite-updates.com
69.56.20.243	A	mail7.excite-updates.com
69.56.21.25	A+PTR	mail1.progcorp.com
69.56.21.26	A+PTR	mail2.progcorp.com
69.56.21.27	PTR	mail3.progcorp.com
69.56.21.28	PTR	click1.skillful-executive.com
69.56.21.28	PTR	click1.pbpexecreports.com
69.56.21.28	PTR	click1.safetynews-alert.com
69.56.21.32	A+PTR	mail2.itmanager-daily.com
69.56.21.33	A+PTR	mail1.customerexperience-insight.com
69.56.21.34	A+PTR	mail2.customerexperience-insight.com
69.56.21.35	A+PTR	mail1.cfo-dailynews.com
69.56.21.51	A+PTR	mail1.pbpexecreports.com
69.56.21.52	A+PTR	mail2.pbpexecreports.com
69.56.21.53	A	mail1.higheredhero.com
69.56.21.54	A	mail2.higheredhero.com
69.56.21.64	A	click1.executiveonlinecontent.com
69.56.21.65	A	mail1.executiveonlinecontent.com
69.56.21.66	A	mail2.executiveonlinecontent.com
69.56.21.71	A+PTR	mail3.advanceyourcareers.com
69.56.21.80	A+PTR	mail1.mylaborlawalerts.com
69.56.21.81	A+PTR	mail2.mylaborlawalerts.com
69.56.24.152	A	mail1.greatamericanphotocontest-info.com
69.56.24.152	A	www.greatamericanphotocontest-info.com
69.56.24.153	A	mail2.greatamericanphotocontest-info.com
69.56.24.154	A	mail3.greatamericanphotocontest-info.com
69.56.24.209	A	mail1.yallwire-email.com
69.56.24.210	A	mail2.yallwire-email.com
69.56.24.211	A	mail3.yallwire-email.com
69.56.24.222	A	mail6.yallwire-mail.com
69.56.25.132	A	click1.centennialrenews-mail.com
69.56.25.136	A	mail4.centennialrenews-mail.com
69.56.25.140	A	hostmaster.centennialrequest-mail.com
69.56.25.143	A	mail3.centennialrequest-mail.com
69.56.25.146	A	mail6.centennialrequest-mail.com
69.56.25.147	A	mail7.centennialrequest-mail.com
69.56.25.156	A	click1.premiergoldupdate-mail.com
69.56.25.157	A	mail1.premiergoldupdate-mail.com
69.56.25.161	A	mail5.premiergoldupdate-mail.com
69.56.25.162	A	mail6.premiergoldupdate-mail.com
69.56.25.163	A	mail7.premiergoldupdate-mail.com
69.56.26.8	PTR	click1.newsletter.channelone.com
69.56.26.8	A	newsletter.channelone.com
69.56.26.9	A+PTR	mail1.newsletter.channelone.com
69.56.26.10	A+PTR	mail2.newsletter.channelone.com
69.56.26.11	A+PTR	mail3.newsletter.channelone.com
69.56.26.16	A+PTR	click1.ausfis-members.com
69.56.26.16	A	ausfis-members.com
69.56.26.16	A	*.ausfis-members.com
69.56.26.17	A+PTR	mail1.ausfis-members.com
69.56.26.18	PTR	mail2.ausfis-members.com
69.56.26.19	PTR	mail3.ausfis-members.com
69.56.26.32	PTR	click1.canadianvisaexpert.net
69.56.26.32	A	*.canadianvisaexpert.net
69.56.26.33	A+PTR	mail1.canadianvisaexpert.net
69.56.26.34	A+PTR	mail2.canadianvisaexpert.net
69.56.26.35	A+PTR	mail3.canadianvisaexpert.net
69.56.26.49	A+PTR	mail1.email.usafis-mail.net
69.56.26.50	A+PTR	mail2.email.usafis-mail.net
69.56.26.51	A+PTR	mail3.email.usafis-mail.net
69.56.26.52	A+PTR	mail4.email.usafis-mail.net
69.56.26.65	A+PTR	mail1.postup-email.com
69.56.26.66	A+PTR	mail2.postup-email.com
69.56.26.67	A+PTR	mail3.postup-email.com
69.56.26.68	A+PTR	mail4.postup-email.com
69.56.26.88	A	email.ijobmaster.com
69.56.26.89	A	mail1.email.ijobmaster.com
69.56.26.90	A	mail2.email.ijobmaster.com
69.56.26.91	A	mail3.email.ijobmaster.com
69.56.26.97	A+PTR	mail1.becomeacanadian.email
69.56.26.98	A+PTR	mail2.becomeacanadian.email
69.56.26.99	A+PTR	mail3.becomeacanadian.email
69.56.26.100	A+PTR	mail4.becomeacanadian.email
69.56.26.120	A+PTR	mail8.canadianvisaexpert.net
69.56.26.121	A+PTR	mail9.canadianvisaexpert.net
69.56.26.122	A+PTR	mail10.canadianvisaexpert.net
69.56.26.123	A+PTR	mail11.canadianvisaexpert.net
69.56.26.128	A+PTR	mail1.immiproaustralia.net
69.56.26.129	A+PTR	mail2.immiproaustralia.net
69.56.26.130	A+PTR	mail3.immiproaustralia.net
69.56.26.131	A+PTR	mail4.immiproaustralia.net
69.56.26.152	A+PTR	mail1.jobsaworld.email
69.56.26.153	A+PTR	mail2.jobsaworld.email
69.56.26.154	A+PTR	mail3.jobsaworld.email
69.56.26.161	A+PTR	mail1.email.mediacross.com
69.56.26.162	A+PTR	mail2.email.mediacross.com
69.56.26.163	A+PTR	mail3.email.mediacross.com
69.56.26.164	A+PTR	mail4.email.mediacross.com
69.56.26.184	A+PTR	mail1.canadianvp.info
69.56.26.185	A+PTR	mail2.canadianvp.info
69.56.26.186	A+PTR	mail3.canadianvp.info
69.56.26.187	A+PTR	mail4.canadianvp.info
69.56.26.192	A+PTR	mail1.gclexperts.net
69.56.26.193	A+PTR	mail2.gclexperts.net
69.56.26.194	A+PTR	mail3.gclexperts.net
69.56.26.195	A+PTR	mail4.gclexperts.net
69.56.27.24	A	click1.mail.deals2buy.com
69.56.27.24	A	mail.deals2buy.com
69.56.27.25	A	mail1.mail.deals2buy.com
69.56.27.26	A	mail2.mail.deals2buy.com
69.56.27.32	A	mail.couponseven.com
69.56.27.33	A	mail1.mail.couponseven.com
69.56.27.39	A	mail7.mail.couponseven.com
69.56.27.40	A	mail.couponshare.com
69.56.27.48	A	mail.deals.com
69.56.27.49	A	mail1.mail.deals.com
69.56.27.56	A	hostmaster.email.retailmenot.com
69.56.27.56	A	email.retailmenot.com
69.56.27.64	PTR	click1.email.retailmenot.ca
69.56.27.64	A	email.retailmenot.ca
69.56.27.65	A+PTR	mail1.email.retailmenot.ca
69.56.27.66	A+PTR	mail2.email.retailmenot.ca
69.56.27.67	A+PTR	mail3.email.retailmenot.ca
69.56.30.8	PTR	mail1.email.carepackages.com
69.56.30.8	A	email.carepackages.com
69.56.30.9	PTR	mail2.email.carepackages.com
69.56.30.10	A+PTR	mail3.email.carepackages.com
69.56.30.11	A+PTR	mail4.email.carepackages.com
69.56.30.13	A	mail6.email.carepackages.com
69.56.30.16	PTR	click1.email.rhl.org
69.56.30.16	A	email.rhl.org
69.56.30.20	A	mail4.email.rhl.org
69.56.30.21	A	mail5.email.rhl.org
69.56.30.24	A	email.campusbackup.org
69.56.30.32	A	email.carepackages.org
69.56.30.37	A	mail5.email.carepackages.org
69.56.30.38	A	mail6.email.carepackages.org
69.56.30.39	A	mail7.email.carepackages.org
69.56.30.48	A+PTR	click1.email.ocm.com
69.56.30.48	A	email.ocm.com
69.56.30.49	PTR	mail1.email.ocm.com
69.56.30.49	A	mail3.email.lee.net
69.56.30.50	PTR	mail2.email.ocm.com
69.56.30.50	A	mail4.email.lee.net
69.56.30.51	PTR	mail3.email.ocm.com