Robtex

Up: 216.75.96.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 216.75.100.0/23
Down right: 216.75.102.0/23

IP	Type	Hostname
216.75.103.33	PTR	ip-216-75-103-33.ipntelecom.net
216.75.103.66	PTR	ip-216-75-103-66.ipntelecom.net
216.75.103.144	PTR	ip-216-75-103-144.ipntelecom.net
216.75.103.172	PTR	ip-216-75-103-172.ipntelecom.net
216.75.103.240	PTR	ip-216-75-103-240.ipntelecom.net
216.75.103.255	PTR	ip-216-75-103-255.ipntelecom.net