Robtex

Up: 123.16.64.0/19
Can't show all results, try to descend to a more specific CIDR
Down left: 123.16.64.0/21
Down right: 123.16.72.0/21

IP	Type	Hostname
123.16.64.0	PTR	static.vnpt.vn
123.16.64.19	PTR	static.vnpt.vn
123.16.64.66	PTR	static.vnpt.vn
123.16.64.81	PTR	static.vnpt.vn
123.16.64.130	PTR	static.vnpt.vn
123.16.64.144	PTR	static.vnpt.vn
123.16.64.146	PTR	static.vnpt.vn
123.16.64.147	PTR	static.vnpt.vn
123.16.64.194	PTR	static.vnpt.vn
123.16.64.208	PTR	static.vnpt.vn
123.16.64.243	PTR	static.vnpt.vn
123.16.66.81	PTR	static.vnpt.vn
123.16.66.83	PTR	static.vnpt.vn
123.16.66.178	PTR	static.vnpt.vn
123.16.66.227	PTR	localhost
123.16.67.16	PTR	localhost
123.16.67.226	PTR	static.vnpt.vn
123.16.68.80	PTR	localhost
123.16.68.177	PTR	localhost
123.16.72.83	PTR	static.vnpt.vn
123.16.74.0	PTR	static.vnpt.vn
123.16.74.1	PTR	static.vnpt.vn
123.16.74.64	PTR	static.vnpt.vn
123.16.74.82	PTR	static.vnpt.vn
123.16.74.115	PTR	static.vnpt.vn
123.16.74.162	PTR	static.vnpt.vn
123.16.74.179	PTR	static.vnpt.vn
123.16.74.194	PTR	static.vnpt.vn
123.16.75.176	PTR	localhost
123.16.76.19	PTR	localhost
123.16.77.2	PTR	static.vnpt.vn
123.16.77.34	PTR	static.vnpt.vn
123.16.77.211	PTR	static.vnpt.vn
123.16.77.227	PTR	static.vnpt.vn
123.16.78.8	PTR	static.vnpt.vn
123.16.78.24	PTR	static.vnpt.vn
123.16.78.86	PTR	static.vnpt.vn
123.16.78.100	PTR	localhost
123.16.78.151	PTR	static.vnpt.vn
123.16.78.179	PTR	static.vnpt.vn
123.16.78.219	PTR	localhost
123.16.78.220	PTR	static.vnpt.vn
123.16.78.242	PTR	static.vnpt.vn