Robtex

Up: 76.77.16.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 76.77.20.0/23
Down right: 76.77.22.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
76.77.20.0	PTR	mgmt-76-77-20-0.scatui.net
76.77.20.40	PTR	mgmt-76-77-20-40.scatui.net
76.77.20.58	PTR	mgmt-76-77-20-58.scatui.net
76.77.20.153	A+PTR	mail.sancarlos.k12.az.us
76.77.20.158	PTR	mail.sancarlos.k12.az.us
76.77.20.204	PTR	dsl-76-77-20-204.scatui.net
76.77.21.1	PTR	dsl-76-77-21-1.scatui.net
76.77.21.44	A	r1.sn-ojvh-acce.googlevideo.com
76.77.21.44	A	r1.sn-ojvh-acce.gvt1.com
76.77.21.45	A	r2.sn-ojvh-acce.googlevideo.com
76.77.21.45	A	r2.sn-ojvh-acce.gvt1.com
76.77.21.143	PTR	dsl-76-77-21-143.scatui.net
76.77.21.143	A	occ-0-1238-590.1.nflxso.net
76.77.21.143	A	occ-0-1238-37.1.nflxso.net
76.77.21.186	PTR	dsl-76-77-21-186.scatui.net
76.77.21.186	A	ns4.networklubbock.com
76.77.21.186	A	ns4.ncom.com
76.77.21.225	PTR	dsl-76-77-21-225.scatui.net
76.77.21.225	A	ipv4-c001-cnm001-lubbock-isp.ftl.nflxvideo.net
76.77.21.225	A	ipv4-c001-cnm001-lubbock-isp.1.oca.nflxvideo.net
76.77.23.1	PTR	dsl-76-77-23-1.scatui.net
76.77.23.10	PTR	dsl-76-77-23-10.scatui.net
76.77.23.22	PTR	dsl-76-77-23-22.dellcity.com
76.77.23.25	PTR	dsl-76-77-23-25.scatui.net
76.77.23.28	PTR	dsl-76-77-23-28.scatui.net
76.77.23.46	PTR	dsl-76-77-23-46.scatui.net
76.77.23.50	PTR	dsl-76-77-23-50.scatui.net
76.77.23.52	PTR	dsl-76-77-23-52.scatui.net
76.77.23.57	PTR	dsl-76-77-23-57.scatui.net
76.77.23.67	PTR	dsl-76-77-23-67.scatui.net
76.77.23.71	PTR	dsl-76-77-23-71.scatui.net
76.77.23.84	PTR	dsl-76-77-23-84.scatui.net
76.77.23.216	PTR	dsl-76-77-23-216.dellcity.com
76.77.23.235	PTR	dsl-76-77-23-235.scatui.net