Robtex

Up: 173.199.64.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 173.199.72.0/22
Down right: 173.199.76.0/22

IP	Type	Hostname
173.199.72.12	PTR	173.199.72.12.choopa.net
173.199.72.73	PTR	173.199.72.73.choopa.net
173.199.72.73	A	london1.uk.servers.ironforce.net
173.199.72.131	PTR	173.199.72.131.choopa.net
173.199.72.209	PTR	173.199.72.209.choopa.net
173.199.73.67	PTR	173.199.73.67.choopa.net
173.199.76.160	PTR	173.199.76.160.choopa.net
173.199.77.1	PTR	vl101-br1-cer.lon3.choopa.net
173.199.77.2	PTR	vl101-ds4.lon2.choopa.net
173.199.77.24	PTR	173.199.77.24.choopa.net
173.199.77.27	PTR	173.199.77.27.choopa.net
173.199.77.49	PTR	173.199.77.49.choopa.net
173.199.77.58	PTR	173.199.77.58.choopa.net
173.199.77.74	PTR	173.199.77.74.choopa.net
173.199.77.75	PTR	173.199.77.75.choopa.net
173.199.77.89	PTR	173.199.77.89.choopa.net
173.199.77.90	PTR	173.199.77.90.choopa.net
173.199.77.98	PTR	173.199.77.98.choopa.net
173.199.77.107	PTR	173.199.77.107.choopa.net
173.199.77.131	PTR	173.199.77.131.choopa.net
173.199.77.137	PTR	173.199.77.137.choopa.net
173.199.77.138	PTR	173.199.77.138.choopa.net
173.199.77.168	PTR	173.199.77.168.choopa.net
173.199.77.169	PTR	173.199.77.169.choopa.net
173.199.77.171	PTR	173.199.77.171.choopa.net
173.199.77.178	PTR	173.199.77.178.choopa.net
173.199.77.179	PTR	173.199.77.179.choopa.net
173.199.77.195	PTR	173.199.77.195.choopa.net
173.199.77.208	PTR	173.199.77.208.choopa.net
173.199.77.210	PTR	173.199.77.210.choopa.net
173.199.77.219	PTR	173.199.77.219.choopa.net
173.199.78.9	PTR	173.199.78.9.choopa.net
173.199.79.0	PTR	173.199.79.0.choopa.net