Robtex

Up: 72.45.32.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 72.45.36.0/23
Down right: 72.45.38.0/23

IP	Type	Hostname
72.45.36.0	A+PTR	72-45-36-000-dhcp.shp.pa.atlanticbb.net
72.45.36.232	A+PTR	72-45-36-232-dhcp.shp.pa.atlanticbb.net
72.45.37.64	A	72-45-37-064-dhcp.shp.pa.atlanticbb.net
72.45.38.10	A+PTR	72-45-38-010-static.shp.pa.atlanticbb.net
72.45.39.2	A+PTR	72-45-39-002-static.shp.pa.atlanticbb.net
72.45.39.255	A+PTR	72-45-39-255-static.shp.pa.atlanticbb.net