Robtex

Up: 204.15.172.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 204.15.172.0/25
Down right: 204.15.172.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
204.15.172.0	A+PTR	ip-204-15-172-0.sjc.hootops.com
204.15.172.65	A	re1-ix1.sjc.hootops.com
204.15.172.215	PTR	ip-204-15-172-215.sjc.hootops.com
204.15.172.215	A	dsft.it
204.15.172.215	A	emls.co
204.15.172.228	A+PTR	ip-204-15-172-228.sjc.hootops.com
204.15.172.228	A	sk12.us
204.15.172.228	A	davespr.com
204.15.172.246	PTR	ip-204-15-172-246.sjc.hootops.com
204.15.172.246	A	owl.ly
204.15.172.246	A	onepath.co