Robtex

Up: 173.16.224.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 173.16.232.0/22
Down right: 173.16.236.0/22

IP	Type	Hostname
173.16.232.0	A+PTR	173-16-232-0.client.mchsi.com
173.16.232.1	A+PTR	173-16-232-1.client.mchsi.com
173.16.232.108	A+PTR	173-16-232-108.client.mchsi.com
173.16.233.193	A+PTR	173-16-233-193.client.mchsi.com
173.16.233.197	A	173-16-233-197.client.mchsi.com
173.16.233.202	A+PTR	173-16-233-202.client.mchsi.com
173.16.234.99	PTR	173-16-234-99.client.mchsi.com
173.16.234.99	A	zork3.zorknet.net
173.16.234.248	A+PTR	173-16-234-248.client.mchsi.com
173.16.235.26	A+PTR	173-16-235-26.client.mchsi.com
173.16.236.80	A+PTR	173-16-236-80.client.mchsi.com
173.16.237.8	A+PTR	173-16-237-8.client.mchsi.com
173.16.237.100	PTR	173-16-237-100.client.mchsi.com
173.16.239.19	A	173-16-239-19.client.mchsi.com
173.16.239.160	A	173-16-239-160.client.mchsi.com
173.16.239.243	A+PTR	173-16-239-243.client.mchsi.com