Robtex

Up: 199.212.0.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 199.212.0.0/25
Down right: 199.212.0.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
199.212.0.5	PTR	lb.dc4.arin.net
199.212.0.6	PTR	lb1.dc4.arin.net
199.212.0.7	PTR	lb2-ext.dc4.arin.net
199.212.0.46	A+PTR	whois.arin.net
199.212.0.48	A+PTR	rwhois.arin.net
199.212.0.53	A	tinnie.arin.net
199.212.0.53	A	ns-arin.6to4.nro.net
199.212.0.63	A+PTR	z.arin.net
199.212.0.73	PTR	a.in-addr-servers.arpa
199.212.0.83	A+PTR	gns.dc4.arin.net
199.212.0.99	PTR	com.dc4.arin.net
199.212.0.101	PTR	tinnie1.dc4.arin.net
199.212.0.102	PTR	tinnie2.dc4.arin.net
199.212.0.104	PTR	z1.dc4.arin.net
199.212.0.107	A	lists.arin.net
199.212.0.108	A+PTR	ns1.arin.net
199.212.0.108	A	ns1.getipv6.net
199.212.0.109	PTR	rr.arin.net
199.212.0.126	PTR	whoisrws6.dc4.arin.net
199.212.0.149	A+PTR	rrdp.arin.net
199.212.0.150	A+PTR	rpki.arin.net
199.212.0.151	A+PTR	ftp.arin.net
199.212.0.152	A+PTR	rr.arin.net
199.212.0.155	A+PTR	getipv6.info
199.212.0.155	A	getipv6.org
199.212.0.155	A	www.getipv6.org
199.212.0.160	A+PTR	rdap.arin.net