Robtex

Up: 173.245.96.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 173.245.104.0/22
Down right: 173.245.108.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
173.245.104.36	PTR	mail.furaffinity.net
173.245.104.66	PTR	cr1.dca1.inforelay.net
173.245.104.70	PTR	www.dhk.com
173.245.104.75	PTR	mx.dhk.com
173.245.104.236	A	cedarcc.cl
173.245.107.141	PTR	mailtest.100mbpsservers.com
173.245.108.6	PTR	gs.blackbirdtech.com
173.245.108.7	A+PTR	ttl.blackbirdtech.com
173.245.108.7	A	204.136.82.in-addr.arpa
173.245.108.36	PTR	webmail.blackbirdtech.com
173.245.108.37	PTR	timekeeper.blackbirdtech.com
173.245.108.38	PTR	mx.blackbirdtech.com
173.245.108.38	A	hamiltonstationestates.com
173.245.108.39	A	webmail.blackbirdtech.com
173.245.108.40	A	helpdesk.blackbirdtech.com
173.245.108.41	PTR	ns1.blackbirdtech.com
173.245.108.41	A	blackbirdtek.com
173.245.108.41	A	blackbird.biz
173.245.108.42	PTR	home.blackbirdtech.com
173.245.108.50	A	mx2.blackbirdtech.com
173.245.108.58	A	blackbirdcreativemedia.com
173.245.108.71	A	mx.gothaminttl.com
173.245.108.103	A	rs.redscirocco.com
173.245.108.230	A+PTR	support.sitelutions.com
173.245.108.230	A	forum.sitelutions.com
173.245.108.241	A+PTR	www1.iad3.inforelay.net
173.245.108.241	A	www.inforelay.com