Robtex

Up: 66.128.32.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 66.128.32.0/22
Down right: 66.128.36.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
66.128.32.0	A+PTR	host-0-32-128-66.rev.itelsa.com.ar
66.128.32.67	A+PTR	host-67-32-128-66.rev.itelsa.com.ar
66.128.32.78	A+PTR	host-78-32-128-66.rev.itelsa.com.ar
66.128.32.78	A	jardinesdelportal.com
66.128.32.78	A	www.jardinesdelportal.com
66.128.32.85	A	host-85-32-128-66.rev.itelsa.com.ar
66.128.32.103	A	correo2.peopleonline.com.co
66.128.32.105	A+PTR	host-105-32-128-66.rev.itelsa.com.ar
66.128.32.114	PTR	host-114-32-128-66.rev.itelsa.com.ar
66.128.32.114	A	floresatlas.com
66.128.32.114	A	cisantabarbara.com
66.128.32.140	A	www.castilla.com.co
66.128.32.154	A	correo2.peopleonline.com.co
66.128.32.157	A	correo2.peopleonline.com.co
66.128.33.8	A+PTR	host-8-33-128-66.rev.itelsa.com.ar
66.128.36.107	PTR	host-107-36-128-66.rev.itelsa.com.ar
66.128.36.182	A+PTR	host-182-36-128-66.rev.itelsa.com.ar
66.128.37.145	A+PTR	host-145-37-128-66.rev.itelsa.com.ar
66.128.37.145	A	scontent.fcoc1-1.fna.fbcdn.net
66.128.37.146	A+PTR	host-146-37-128-66.rev.itelsa.com.ar
66.128.37.146	A	video.fcoc1-1.fna.fbcdn.net
66.128.37.160	A+PTR	host-160-37-128-66.rev.itelsa.com.ar
66.128.37.160	A	z-p3-scontent.fcoc1-1.fna.fbcdn.net
66.128.37.161	A+PTR	host-161-37-128-66.rev.itelsa.com.ar
66.128.37.161	A	instagram.fcoc1-1.fna.fbcdn.net
66.128.37.162	PTR	host-162-37-128-66.rev.itelsa.com.ar
66.128.37.236	A+PTR	host-236-37-128-66.rev.itelsa.com.ar
66.128.37.236	A	r1.sn-puxan5-gvne.googlevideo.com
66.128.37.236	A	r1.sn-puxan5-gvne.gvt1.com
66.128.37.237	PTR	host-237-37-128-66.rev.itelsa.com.ar
66.128.37.237	A	r2.sn-puxan5-gvne.googlevideo.com
66.128.38.4	A+PTR	host-4-38-128-66.rev.itelsa.com.ar