Robtex

Up: 72.170.0.0/16
Can't show all results, try to descend to a more specific CIDR
Down left: 72.170.128.0/18
Down right: 72.170.192.0/18
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
72.170.128.1	PTR	host72170001128.direcway.com
72.170.167.129	PTR	host7217000129167.direcway.com
72.170.167.130	PTR	host7217000130167.direcway.com
72.170.168.0	PTR	host72170000168.direcway.com
72.170.168.2	PTR	host72170002168.direcway.com
72.170.168.130	PTR	host7217000130168.direcway.com
72.170.168.131	PTR	host7217000131168.direcway.com
72.170.181.189	PTR	host7217000189181.direcway.com
72.170.200.130	PTR	host7217000130200.direcway.com
72.170.200.131	PTR	host7217000131200.direcway.com
72.170.218.0	PTR	host72170000218.direcway.com
72.170.218.3	PTR	host72170003218.direcway.com
72.170.218.131	PTR	host7217000131218.direcway.com
72.170.224.47	A	lucianvittori.com
72.170.224.47	A	mail.lucianvittori.com
72.170.224.147	PTR	host7217000147224.direcway.com
72.170.224.167	PTR	host7217000167224.direcway.com
72.170.225.130	PTR	host7217000130225.direcway.com
72.170.225.208	PTR	host7217000208225.direcway.com
72.170.228.49	PTR	host721700049228.direcway.com
72.170.230.105	PTR	host7217000105230.direcway.com
72.170.231.39	PTR	host721700039231.direcway.com
72.170.236.3	PTR	host72170003236.direcway.com
72.170.236.3	A	www.realm-o-tigger.com
72.170.238.89	PTR	host721700089238.direcway.com
72.170.238.89	A	willowcreekheat.com
72.170.239.8	PTR	host72170008239.direcway.com
72.170.239.8	A	canihomebeta.net
72.170.241.8	PTR	host72170008241.direcway.com
72.170.241.8	A	howbritereps.com
72.170.244.8	PTR	host72170008244.direcway.com
72.170.244.8	A	fyi911.net
72.170.245.115	PTR	host7217000115245.direcway.com
72.170.245.149	PTR	host7217000149245.direcway.com
72.170.245.183	PTR	host7217000183245.direcway.com
72.170.246.118	PTR	host7217000118246.direcway.com
72.170.246.118	A	bfoster.org
72.170.246.126	PTR	host7217000126246.direcway.com
72.170.246.126	A	stationmgmtsite.com
72.170.250.130	PTR	host7217000130250.direcway.com
72.170.250.130	A	equalresponsibility.mobi
72.170.250.130	A	equalresponsibility.org
72.170.251.160	PTR	host7217000160251.direcway.com
72.170.251.160	A	www.chucksbasix.com
72.170.251.160	A	chucksbasix.com
72.170.251.194	PTR	host7217000194251.direcway.com
72.170.251.194	A	russellcolombo.com