Robtex

Up: 222.255.0.0/22
Can't show all results, try to descend to a more specific CIDR
Down left: 222.255.0.0/24
Down right: 222.255.1.0/24
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
222.255.0.18	PTR	pgpextsrv.vks.gov.vn
222.255.0.21	PTR	ftp.vks.gov.vn
222.255.0.26	PTR	mail.vinalines.com.vn
222.255.0.27	A+PTR	mail.vinalines.com.vn
222.255.0.27	PTR	www.vinalines.com.vn
222.255.0.28	PTR	static.vnpt.vn
222.255.0.41	A+PTR	smtp.toaan.gov.vn
222.255.0.42	PTR	toaan.gov.vn
222.255.0.42	PTR	mailstore.toaan.gov.vn
222.255.0.42	A+PTR	pop3.toaan.gov.vn
222.255.0.43	A+PTR	mail.toaan.gov.vn
222.255.0.45	PTR	mail.toaan.gov.vn
222.255.0.46	PTR	static.vnpt.vn
222.255.0.46	A	namdinh.toaan.gov.vn
222.255.0.46	A	hatinh.toaan.gov.vn
222.255.0.70	PTR	static.vnpt.vn
222.255.0.100	PTR	mail.cavico.com.vn
222.255.0.100	PTR	mail.cavicovn.com.vn
222.255.0.114	PTR	mail.thanglongsc.com.vn
222.255.0.114	PTR	mail2.thanglongsc.com.vn
222.255.0.129	PTR	homer.abacuspos.com.vn
222.255.0.129	A	abacuspos.com.vn
222.255.0.172	PTR	static.vnpt.vn
222.255.0.187	PTR	vnab.abacuspos.com.vn
222.255.0.195	PTR	mx2.libertyinsurance.com.vn
222.255.0.234	PTR	static.vnpt.vn
222.255.0.250	PTR	mail.pvi.com.vn
222.255.0.251	PTR	smtp.pvi.com.vn
222.255.1.0	PTR	static.vnpt.vn
222.255.1.2	PTR	ns1.neo.com.vn
222.255.1.3	PTR	static.vdc.vn
222.255.1.4	PTR	static.vnpt.vn
222.255.1.5	PTR	static.vdc.vn
222.255.1.9	PTR	static.vdc.vn
222.255.1.10	PTR	static.vnpt.vn
222.255.1.14	PTR	static.vnpt.vn
222.255.1.25	PTR	qh.gov.vn
222.255.1.25	A	mail.quochoi.vn
222.255.1.26	PTR	smtp.qh.gov.vn
222.255.1.26	A	qh.gov.vn
222.255.1.27	PTR	static.vnpt.vn
222.255.1.30	PTR	static.vdc.vn
222.255.1.33	PTR	static.vdc.vn
222.255.1.35	PTR	static.vdc.vn
222.255.1.39	PTR	static.vdc.vn
222.255.1.50	PTR	static.vdc.vn
222.255.1.60	PTR	static.vdc.vn
222.255.1.65	PTR	static.vnpt.vn
222.255.1.74	PTR	static.vnpt.vn
222.255.1.80	PTR	static.vdc.vn
222.255.1.82	PTR	wru.edu.vn
222.255.1.85	PTR	www3.wru.edu.vn
222.255.1.87	PTR	www5.wru.edu.vn
222.255.1.88	PTR	www6.wru.edu.vn
222.255.1.121	PTR	static.vdc.vn
222.255.1.131	PTR	mail.vanlaack.com.vn
222.255.1.147	PTR	static.vnpt.vn
222.255.1.162	PTR	static.vnpt.vn
222.255.1.167	PTR	static.vdc.vn
222.255.1.169	PTR	static.vnpt.vn
222.255.1.176	PTR	static.vnpt.vn
222.255.1.188	PTR	static.vnpt.vn
222.255.1.195	PTR	static.vnpt.vn
222.255.1.206	PTR	static.vnpt.vn
222.255.1.216	PTR	baigiang.wru.edu.vn
222.255.1.217	PTR	static.vnpt.vn
222.255.1.223	PTR	static.vdc.vn
222.255.1.227	PTR	static.vdc.vn
222.255.1.229	PTR	static.vnpt.vn
222.255.1.250	PTR	static.vdc.vn
222.255.1.255	PTR	static.vnpt.vn