Robtex

Up: 216.38.224.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 216.38.228.0/23
Down right: 216.38.230.0/23

IP	Type	Hostname
216.38.228.7	PTR	7.228.38.216.in-addr.arpa
216.38.228.30	PTR	30.228.38.216.in-addr.arpa
216.38.228.75	PTR	75.228.38.216.in-addr.arpa
216.38.228.107	PTR	107.228.38.216.in-addr.arpa
216.38.228.206	PTR	206.228.38.216.in-addr.arpa
216.38.228.252	PTR	252.228.38.216.in-addr.arpa
216.38.229.25	PTR	25.229.38.216.in-addr.arpa
216.38.231.9	PTR	9.231.38.216.in-addr.arpa
216.38.231.13	PTR	13.231.38.216.in-addr.arpa
216.38.231.19	PTR	19.231.38.216.in-addr.arpa
216.38.231.105	PTR	105.231.38.216.in-addr.arpa
216.38.231.188	PTR	188.231.38.216.in-addr.arpa