Robtex

Up: 140.228.48.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 140.228.48.0/23
Down right: 140.228.50.0/23

IP	Type	Hostname
140.228.49.70	PTR	vlan-49-070.onu.edu
140.228.49.160	A+PTR	vlan-49-160.onu.edu
140.228.50.46	A+PTR	vlan-50-046.onu.edu
140.228.50.212	A+PTR	vlan-50-212.onu.edu
140.228.51.77	A+PTR	vlan-51-077.onu.edu
140.228.51.221	A+PTR	vlan-51-221.onu.edu
140.228.51.237	A+PTR	vlan-51-237.onu.edu