Robtex

Up: 72.19.32.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 72.19.32.0/22
Down right: 72.19.36.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
72.19.32.0	PTR	72-19-32-net.cascadeaccess.com
72.19.32.92	A	mail.finaldetailsinc.com
72.19.32.102	A	ftth-static-72-19-32-102.rioaccess.com
72.19.32.199	A	mail.almarpls.com
72.19.33.163	A+PTR	ftth-static-72-19-33-163.rioaccess.com
72.19.33.163	A	ns1.havetech.com
72.19.33.163	A	ns2.hostingsolved.com
72.19.33.164	PTR	ftth-static-72-19-33-164.rioaccess.com
72.19.33.164	A	ns2.hostingsolved.com
72.19.34.46	A	pppoe-72-19-34-046.rioaccess.com
72.19.34.214	A	pppoe-72-19-34-214.rioaccess.com
72.19.35.2	A	pppoe-72-19-35-002.rioaccess.com
72.19.36.2	A+PTR	pppoe-72-19-36-002.rioaccess.com
72.19.38.27	A+PTR	pppoe-72-19-38-027.rioaccess.com
72.19.39.16	A+PTR	ftth-static-72-19-39-016.rioaccess.com
72.19.39.59	A	extranet.brainspinesleep.com
72.19.39.59	A	mail.mesaviewmedical.com
72.19.39.100	A	ftth-static-72-19-39-100.rioaccess.com
72.19.39.122	A+PTR	ftth-static-72-19-39-122.rioaccess.com
72.19.39.158	A	ftth-static-72-19-39-158.rioaccess.com
72.19.39.228	A	opera-int2.eurekamesquite.com
72.19.39.229	A	ftp.eurekamesquite.com
72.19.39.253	A	ftth-static-72-19-39-253.rioaccess.com