Robtex

Up: 27.126.144.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 27.126.144.0/22
Down right: 27.126.148.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
27.126.144.2	PTR	mx1.createsend.com
27.126.144.5	PTR	mx1.createsend.com
27.126.144.5	A	mx.campaignperformance.com
27.126.144.10	PTR	mx0.inbound.creatsend.com
27.126.144.10	A	mx1.createsend.com
27.126.144.11	PTR	mx1.inbound.creatsend.com
27.126.144.11	A	mx1.createsend.com
27.126.145.11	PTR	createsend.com
27.126.145.11	A	campaignreport.net
27.126.145.11	A	www.viewcampaign.com
27.126.145.12	PTR	createsend.com
27.126.145.12	A	campaignreport.net
27.126.145.12	A	csd.io
27.126.145.21	PTR	api.createsend.com
27.126.145.22	PTR	api.createsend.com
27.126.145.23	PTR	api.createsend.com
27.126.145.24	PTR	api.createsend.com
27.126.145.25	PTR	api.createsend.com
27.126.145.26	PTR	api.createsend.com
27.126.145.27	PTR	api.createsend.com
27.126.145.31	A	com.sgwww.campaignmonitor.com
27.126.145.31	A	createsend5.com.createsend5.com
27.126.145.32	PTR	createsend1.com
27.126.145.32	A	com.sgwww.campaignmonitor.com
27.126.145.32	A	createsend5.com.createsend5.com
27.126.145.41	A	forward-email.com
27.126.145.42	PTR	forwardtomyfriend.com
27.126.145.42	A	forward-email.com
27.126.145.51	PTR	updatemyprofile.com
27.126.145.52	PTR	updatemyprofile.com
27.126.145.71	PTR	signup.campaignmonitor.com
27.126.145.72	PTR	signup.campaignmonitor.com
27.126.145.81	PTR	help.campaignmonitor.com
27.126.145.82	PTR	help.campaignmonitor.com
27.126.145.105	A	fixoutlook.org
27.126.145.105	A	*.fixoutlook.org
27.126.145.106	A	fixoutlook.org
27.126.145.106	A	*.fixoutlook.org
27.126.145.107	A	mailbuild.com
27.126.145.108	A	mailbuild.com
27.126.146.0	A	mail.novartis-esc.com
27.126.146.2	A+PTR	mx2.b.outbound.createsend.com
27.126.146.3	A+PTR	mx3.b.outbound.createsend.com
27.126.146.9	PTR	mx9.b.outbound.createsend.com
27.126.146.10	PTR	mx10.b.outbound.createsend.com
27.126.146.11	A+PTR	mx11.b.outbound.createsend.com
27.126.146.12	A	mx12.b.outbound.createsend.com
27.126.146.13	A	mx13.b.outbound.createsend.com
27.126.146.17	A+PTR	mx17.b.outbound.createsend.com
27.126.146.18	A+PTR	mx18.b.outbound.createsend.com
27.126.146.19	A+PTR	mx19.b.outbound.createsend.com
27.126.146.21	A	mx21.b.outbound.createsend.com
27.126.146.24	PTR	mx24.b.outbound.createsend.com
27.126.146.26	A+PTR	mx26.b.outbound.createsend.com
27.126.146.28	A	mx28.b.outbound.createsend.com
27.126.146.31	A	mx31.b.outbound.createsend.com
27.126.146.33	A+PTR	mx33.b.outbound.createsend.com
27.126.146.34	PTR	mx34.b.outbound.createsend.com
27.126.146.35	A+PTR	mx35.b.outbound.createsend.com
27.126.146.36	A	mx36.b.outbound.createsend.com
27.126.146.39	A	mx39.b.outbound.createsend.com
27.126.146.41	A+PTR	mx41.b.outbound.createsend.com
27.126.146.42	A+PTR	mx42.b.outbound.createsend.com
27.126.146.44	A	mx44.b.outbound.createsend.com
27.126.146.48	A+PTR	mx48.b.outbound.createsend.com
27.126.146.51	A+PTR	mx51.b.outbound.createsend.com
27.126.146.62	A	mx62.b.outbound.createsend.com
27.126.146.64	A+PTR	mx64.b.outbound.createsend.com
27.126.146.65	A+PTR	mx65.b.outbound.createsend.com
27.126.146.66	A+PTR	mx66.b.outbound.createsend.com
27.126.146.67	A+PTR	mx67.b.outbound.createsend.com
27.126.146.72	A+PTR	mx72.b.outbound.createsend.com
27.126.146.73	A+PTR	mx73.b.outbound.createsend.com
27.126.146.74	A+PTR	mx74.b.outbound.createsend.com
27.126.146.75	A+PTR	mx75.b.outbound.createsend.com
27.126.146.80	A+PTR	mx80.b.outbound.createsend.com
27.126.146.81	PTR	mx81.b.outbound.createsend.com
27.126.146.88	A+PTR	mx88.b.outbound.createsend.com
27.126.146.97	A+PTR	mx97.b.outbound.createsend.com
27.126.146.104	A+PTR	mx104.b.outbound.createsend.com
27.126.146.105	A+PTR	mx105.b.outbound.createsend.com
27.126.146.106	A+PTR	mx106.b.outbound.createsend.com
27.126.146.108	A	mx108.b.outbound.createsend.com
27.126.146.114	A+PTR	mx114.b.outbound.createsend.com
27.126.146.116	A	mx116.b.outbound.createsend.com
27.126.146.118	A	mx118.b.outbound.createsend.com
27.126.146.119	A	mx119.b.outbound.createsend.com
27.126.146.120	A+PTR	mx120.b.outbound.createsend.com
27.126.146.121	A+PTR	mx121.b.outbound.createsend.com
27.126.146.122	A+PTR	mx122.b.outbound.createsend.com
27.126.146.123	A+PTR	mx123.b.outbound.createsend.com
27.126.146.135	A	mx135.b.outbound.createsend.com
27.126.146.137	A+PTR	mx137.b.outbound.createsend.com
27.126.146.139	A+PTR	mx139.b.outbound.createsend.com
27.126.146.145	A+PTR	mx145.b.outbound.createsend.com
27.126.146.151	A	mx151.b.outbound.createsend.com
27.126.146.153	A+PTR	mx153.b.outbound.createsend.com
27.126.146.154	A+PTR	mx154.b.outbound.createsend.com
27.126.146.155	A+PTR	mx155.b.outbound.createsend.com
27.126.146.160	PTR	mx160.b.outbound.createsend.com
27.126.146.165	A	mx165.b.outbound.createsend.com
27.126.146.166	A	mx166.b.outbound.createsend.com
27.126.146.170	A+PTR	mx170.b.outbound.createsend.com
27.126.146.174	A	mx174.b.outbound.createsend.com
27.126.146.177	PTR	mx177.b.outbound.createsend.com
27.126.146.183	A	mx183.b.outbound.createsend.com
27.126.146.184	A+PTR	mx184.b.outbound.createsend.com
27.126.146.185	PTR	mx185.b.outbound.createsend.com
27.126.146.186	A+PTR	mx186.b.outbound.createsend.com
27.126.146.187	A+PTR	mx187.b.outbound.createsend.com
27.126.146.189	A	mx189.b.outbound.createsend.com
27.126.146.196	A	mx196.b.outbound.createsend.com
27.126.146.197	A	mx197.b.outbound.createsend.com
27.126.146.198	A	mx198.b.outbound.createsend.com
27.126.146.200	PTR	mx200.b.outbound.createsend.com
27.126.146.204	A	mx204.b.outbound.createsend.com
27.126.146.205	A	mx205.b.outbound.createsend.com
27.126.146.206	A	mx206.b.outbound.createsend.com
27.126.146.209	A+PTR	mx209.b.outbound.createsend.com
27.126.146.215	A	mx215.b.outbound.createsend.com
27.126.146.216	A+PTR	mx216.b.outbound.createsend.com
27.126.146.238	A	mx238.b.outbound.createsend.com
27.126.146.243	A+PTR	mx243.b.outbound.createsend.com
27.126.146.244	A	mx244.b.outbound.createsend.com
27.126.146.245	A	mx245.b.outbound.createsend.com
27.126.146.249	A+PTR	mx249.b.outbound.createsend.com
27.126.146.250	A+PTR	mx250.b.outbound.createsend.com
27.126.146.252	A	mx252.b.outbound.createsend.com
27.126.146.253	A	mx253.b.outbound.createsend.com
27.126.147.2	A+PTR	mx2.c.outbound.createsend.com
27.126.147.7	A	mx7.c.outbound.createsend.com
27.126.147.16	A+PTR	mx16.c.outbound.createsend.com
27.126.147.17	PTR	mx17.c.outbound.createsend.com
27.126.147.20	A	mx20.c.outbound.createsend.com
27.126.147.22	A	mx22.c.outbound.createsend.com
27.126.147.27	PTR	mx27.c.outbound.createsend.com
27.126.147.30	A	mx30.c.outbound.createsend.com
27.126.147.31	A	mx31.c.outbound.createsend.com
27.126.147.32	A+PTR	mx32.c.outbound.createsend.com
27.126.147.37	A	mx37.c.outbound.createsend.com
27.126.147.40	A+PTR	mx40.c.outbound.createsend.com
27.126.147.45	A	mx45.c.outbound.createsend.com
27.126.147.46	A	mx46.c.outbound.createsend.com
27.126.147.47	A	mx47.c.outbound.createsend.com
27.126.147.49	A+PTR	mx49.c.outbound.createsend.com
27.126.147.50	A+PTR	mx50.c.outbound.createsend.com
27.126.147.51	A+PTR	mx51.c.outbound.createsend.com
27.126.147.58	A+PTR	mx58.c.outbound.createsend.com
27.126.147.60	A	mx60.c.outbound.createsend.com
27.126.147.65	A+PTR	mx65.c.outbound.createsend.com
27.126.147.66	A+PTR	mx66.c.outbound.createsend.com
27.126.147.71	A	mx71.c.outbound.createsend.com
27.126.147.73	A+PTR	mx73.c.outbound.createsend.com
27.126.147.74	A+PTR	mx74.c.outbound.createsend.com
27.126.147.77	A	mx77.c.outbound.createsend.com
27.126.147.78	A	mx78.c.outbound.createsend.com
27.126.147.82	A+PTR	mx82.c.outbound.createsend.com
27.126.147.83	A+PTR	mx83.c.outbound.createsend.com
27.126.147.100	A	mx100.c.outbound.createsend.com
27.126.147.103	A	mx103.c.outbound.createsend.com
27.126.147.115	PTR	mx115.c.outbound.createsend.com
27.126.147.116	A	mx116.c.outbound.createsend.com
27.126.147.120	A+PTR	mx120.c.outbound.createsend.com
27.126.147.130	A+PTR	mx130.c.outbound.createsend.com
27.126.147.131	A+PTR	mx131.c.outbound.createsend.com
27.126.147.136	A+PTR	mx136.c.outbound.createsend.com
27.126.147.146	A+PTR	mx146.c.outbound.createsend.com
27.126.147.147	PTR	mx147.c.outbound.createsend.com
27.126.147.148	A	mx148.c.outbound.createsend.com
27.126.147.157	A	mx157.c.outbound.createsend.com
27.126.147.166	A	mx166.c.outbound.createsend.com
27.126.147.167	A	mx167.c.outbound.createsend.com
27.126.147.170	A+PTR	mx170.c.outbound.createsend.com
27.126.147.172	A	mx172.c.outbound.createsend.com
27.126.147.176	A+PTR	mx176.c.outbound.createsend.com
27.126.147.180	A	mx180.c.outbound.createsend.com
27.126.147.184	A+PTR	mx184.c.outbound.createsend.com
27.126.147.186	A+PTR	mx186.c.outbound.createsend.com
27.126.147.187	A+PTR	mx187.c.outbound.createsend.com
27.126.147.191	A	mx191.c.outbound.createsend.com
27.126.147.194	A+PTR	mx194.c.outbound.createsend.com
27.126.147.197	A	mx197.c.outbound.createsend.com
27.126.147.201	A+PTR	mx201.c.outbound.createsend.com
27.126.147.204	A	mx204.c.outbound.createsend.com
27.126.147.212	A	mx212.c.outbound.createsend.com
27.126.147.213	A	mx213.c.outbound.createsend.com
27.126.147.215	A	mx215.c.outbound.createsend.com
27.126.147.217	A+PTR	mx217.c.outbound.createsend.com
27.126.147.219	PTR	mx219.c.outbound.createsend.com
27.126.147.220	A	mx220.c.outbound.createsend.com
27.126.147.221	A	mx221.c.outbound.createsend.com
27.126.147.227	A+PTR	mx227.c.outbound.createsend.com
27.126.147.230	A	mx230.c.outbound.createsend.com
27.126.147.235	A+PTR	mx235.c.outbound.createsend.com
27.126.147.236	A	mx236.c.outbound.createsend.com
27.126.147.242	A+PTR	mx242.c.outbound.createsend.com
27.126.147.243	A+PTR	mx243.c.outbound.createsend.com
27.126.147.245	A	mx245.c.outbound.createsend.com
27.126.147.249	A+PTR	mx249.c.outbound.createsend.com
27.126.147.252	A	mx252.c.outbound.createsend.com
27.126.147.253	A	mx253.c.outbound.createsend.com