Robtex

Up: 123.31.26.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 123.31.27.0/25
Down right: 123.31.27.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
123.31.27.33	A	kyso.vnpt-ca.vn
123.31.27.41	A	update.vnpt-bhxh.vn
123.31.27.42	PTR	localhost
123.31.27.42	A	vnpt-bhxh.vn
123.31.27.55	PTR	localhost
123.31.27.58	PTR	localhost
123.31.27.59	PTR	localhost
123.31.27.62	PTR	localhost
123.31.27.63	PTR	localhost
123.31.27.64	PTR	localhost
123.31.27.68	PTR	localhost
123.31.27.82	PTR	localhost
123.31.27.83	PTR	localhost
123.31.27.83	A	www.vnerp.vn
123.31.27.84	PTR	localhost
123.31.27.84	A	vnerp.vn
123.31.27.88	PTR	localhost
123.31.27.99	PTR	localhost
123.31.27.99	A	vnptit.vn
123.31.27.113	A	thcsvantrach.edu.vn
123.31.27.113	A	botrach.edu.vn
123.31.27.115	PTR	localhost
123.31.27.115	A	www.vinaphoneplus.com.vn
123.31.27.115	A	cskh.vinaphone.com.vn
123.31.27.119	PTR	localhost
123.31.27.121	PTR	localhost
123.31.27.122	PTR	localhost
123.31.27.130	PTR	static.vnpt.vn
123.31.27.130	A	vnpt.vn
123.31.27.130	A	www.vnpt.vn
123.31.27.134	A	visitninhbinh.vn
123.31.27.134	A	myninhthuan.vn
123.31.27.134	A	mylongan.vn
123.31.27.244	A	elearning.vnpt.vn
123.31.27.244	A	vnedu.edu.vn
123.31.27.246	A	cdn-sandbox.vnpt.edu.vn