Robtex

Up: 216.174.240.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 216.174.244.0/23
Down right: 216.174.246.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
216.174.244.38	A+PTR	mail.kjzy.com
216.174.244.38	PTR	mail.ktry.com
216.174.244.38	A+PTR	mail.kzst.com
216.174.244.72	PTR	216-174-244-72.atgi.net
216.174.244.134	PTR	216-174-244-134.atgi.net
216.174.244.185	PTR	216-174-244-185.atgi.net
216.174.245.88	PTR	216-174-245-88.atgi.net
216.174.245.91	PTR	216-174-245-91.atgi.net
216.174.245.144	PTR	216-174-245-144.atgi.net
216.174.245.192	PTR	216-174-245-192.atgi.net
216.174.245.204	PTR	216-174-245-204.atgi.net
216.174.245.212	PTR	216-174-245-212.atgi.net
216.174.246.149	PTR	srs149.santarosasymphony.com
216.174.246.193	PTR	216-174-246-193.atgi.net
216.174.247.18	A	aquila.lubeair.com
216.174.247.104	PTR	216-174-247-104.atgi.net
216.174.247.166	PTR	216-174-247-166.atgi.net