Robtex

Up: 69.56.16.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 69.56.20.0/23
Down right: 69.56.22.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
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+PTR	mail4.newsletters.wnd.com
69.56.20.12	A+PTR	mail5.newsletters.wnd.com
69.56.20.13	A+PTR	mail6.newsletters.wnd.com
69.56.20.14	A+PTR	mail7.newsletters.wnd.com
69.56.20.15	A+PTR	mail8.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
69.56.20.180	A	mail4.gclexpertsnews.com
69.56.20.181	A	mail5.gclexpertsnews.com
69.56.20.182	A+PTR	mail6.gclexpertsnews.com
69.56.20.183	A	mail7.gclexpertsnews.com
69.56.20.184	A	etype-mail.com
69.56.20.185	A	mail1.etype-mail.com
69.56.20.186	A	mail2.etype-mail.com
69.56.20.187	A	mail3.etype-mail.com
69.56.20.188	PTR	mail3.abroaded.news
69.56.20.188	A	mail4.etype-mail.com
69.56.20.189	A	mail5.etype-mail.com
69.56.20.190	A	mail6.etype-mail.com
69.56.20.191	A	mail7.etype-mail.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
69.56.20.196	A+PTR	mail4.usafismembersclub.com
69.56.20.197	A+PTR	mail5.usafismembersclub.com
69.56.20.198	A+PTR	mail6.usafismembersclub.com
69.56.20.199	A+PTR	mail7.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	A+PTR	click1.safetynews-alert.com
69.56.21.29	PTR	mail1.safetynews-alert.com
69.56.21.31	PTR	mail1.itmanager-daily.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
69.56.21.36	A+PTR	mail2.cfo-dailynews.com
69.56.21.38	A	mail2.hr-morning.com
69.56.21.39	A+PTR	mail1.healthcarebusiness-tech.com
69.56.21.40	A+PTR	mail2.healthcarebusiness-tech.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
69.56.21.55	A+PTR	mail1.phconferences.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
69.56.21.72	A+PTR	mail1.pbpexecutivereports.net
69.56.21.73	A+PTR	mail2.pbpexecutivereports.net
69.56.21.74	PTR	mail1.pbp-reports.net
69.56.21.75	A+PTR	mail2.pbp-reports.net
69.56.21.77	A	mail2.pbp-execreports.net
69.56.21.78	A+PTR	mail1.bestcareercoaching.com
69.56.21.79	A+PTR	mail2.bestcareercoaching.com
69.56.21.80	A+PTR	mail1.mylaborlawalerts.com
69.56.21.81	A+PTR	mail2.mylaborlawalerts.com