Robtex

Up: 222.251.16.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 222.251.16.0/23
Down right: 222.251.18.0/23

IP	Type	Hostname
222.251.16.16	A+PTR	222-251-16-16.mobile.dynamic.aptg.com.tw
222.251.16.39	A+PTR	222-251-16-39.mobile.dynamic.aptg.com.tw
222.251.16.49	A+PTR	222-251-16-49.mobile.dynamic.aptg.com.tw
222.251.16.205	PTR	222-251-16-205.mobile.dynamic.aptg.com.tw
222.251.16.226	A	222-251-16-226.mobile.dynamic.aptg.com.tw
222.251.16.252	A+PTR	222-251-16-252.mobile.dynamic.aptg.com.tw
222.251.19.128	PTR	222-251-19-128.mobile.dynamic.aptg.com.tw