Robtex

Up: 171.228.0.0/15
Can't show all results, try to descend to a more specific CIDR
Down left: 171.228.0.0/17
Down right: 171.228.128.0/17
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
171.228.0.90	PTR	dynamic-ip-adsl.viettel.vn
171.228.10.192	PTR	dynamic-ip-adsl.viettel.vn
171.228.15.2	PTR	dynamic-ip-adsl.viettel.vn
171.228.40.17	A	pjrsuprphmi.net
171.228.40.17	A	enkabyfo.com
171.228.40.17	A	ewzcpfmmqry.net
171.228.67.216	PTR	dynamic-ip-adsl.viettel.vn
171.228.132.72	PTR	dynamic-ip-adsl.viettel.vn
171.228.132.72	A	ngoalong.xyz
171.228.136.98	PTR	dynamic-ip-adsl.viettel.vn
171.228.155.172	PTR	dynamic-ip-adsl.viettel.vn
171.228.160.13	PTR	dynamic-ip-adsl.viettel.vn
171.228.165.74	PTR	dynamic-ip-adsl.viettel.vn
171.228.165.92	PTR	dynamic-adsl.viettel.vn
171.228.167.8	PTR	dynamic-adsl.viettel.vn
171.228.167.8	A	ndvinh.com
171.228.170.212	PTR	dynamic-ip-adsl.viettel.vn
171.228.176.150	PTR	dynamic-ip-adsl.viettel.vn
171.228.186.66	A	rustex.ddns.net
171.228.189.191	A	retavideo.com
171.228.189.228	PTR	dynamic-ip-adsl.viettel.vn
171.228.197.56	PTR	dynamic-adsl.viettel.vn
171.228.201.195	PTR	dynamic-ip-adsl.viettel.vn
171.228.204.86	PTR	dynamic-adsl.viettel.vn
171.228.215.122	PTR	dynamic-ip-adsl.viettel.vn
171.228.216.239	PTR	dynamic-adsl.viettel.vn
171.228.242.52	PTR	dynamic-adsl.viettel.vn
171.228.251.15	PTR	dynamic-ip-adsl.viettel.vn