Robtex

Up: 72.51.136.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 72.51.140.0/23
Down right: 72.51.142.0/23

IP	Type	Hostname
72.51.140.0	PTR	host-72-51-140-0.newwavecomm.net
72.51.140.8	A	mail1.endless-edge.com
72.51.140.28	A+PTR	host-72-51-140-28.newwavecomm.net
72.51.140.58	A	host-72-51-140-58.newwavecomm.net
72.51.140.60	A+PTR	host-72-51-140-60.newwavecomm.net
72.51.140.72	A+PTR	host-72-51-140-72.newwavecomm.net
72.51.140.124	A+PTR	host-72-51-140-124.newwavecomm.net
72.51.140.149	A	host-72-51-140-149.newwavecomm.net
72.51.140.255	A	host-72-51-140-255.newwavecomm.net
72.51.141.21	A	host-72-51-141-21.newwavecomm.net
72.51.141.57	A	host-72-51-141-57.newwavecomm.net
72.51.141.192	A	host-72-51-141-192.newwavecomm.net
72.51.141.201	A	host-72-51-141-201.newwavecomm.net
72.51.142.68	A	host-72-51-142-68.newwavecomm.net
72.51.142.255	PTR	host-72-51-142-255.newwavecomm.net
72.51.143.3	A+PTR	host-72-51-143-3.newwavecomm.net
72.51.143.13	A	host-72-51-143-13.newwavecomm.net
72.51.143.14	A+PTR	host-72-51-143-14.newwavecomm.net
72.51.143.61	A	host-72-51-143-61.newwavecomm.net
72.51.143.88	A	host-72-51-143-88.newwavecomm.net
72.51.143.100	PTR	mail1.dekconsulting.com
72.51.143.144	A	host-72-51-143-144.newwavecomm.net
72.51.143.255	A+PTR	host-72-51-143-255.newwavecomm.net