Robtex

Up: 199.47.216.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 199.47.216.0/23
Down right: 199.47.218.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
199.47.216.5	PTR	pao1-br01.net.sjc.dropbox.com
199.47.216.29	PTR	xe-1-2-0-sjc10-pr01.net.dropbox.com
199.47.216.72	A+PTR	hudson4.sjc.dropbox.com
199.47.216.139	A	sjc-ns1.dropbox.com
199.47.216.144	PTR	sjc-ra115-4b.sjc.dropbox.com
199.47.216.151	A+PTR	sjc-mon1.sjc.dropbox.com
199.47.217.2	A	dl-client8.dropbox.com
199.47.217.2	A	block.dropbox-dns.com
199.47.217.2	A	block-sjc.dropbox-dns.com
199.47.217.9	PTR	sjc-dbh82.sjc.dropbox.com
199.47.217.27	PTR	sjc-ra104-20a.sjc.dropbox.com
199.47.217.34	A	dl-client86.dropbox.com
199.47.217.34	A	dl-client123.dropbox.com
199.47.217.34	A	dl-client55.dropbox.com
199.47.217.36	A	edge-block-api.dropbox-dns.com
199.47.217.65	A	dl-client8.dropbox.com
199.47.217.65	A	block.dropbox-dns.com
199.47.217.65	A	block-sjc.dropbox-dns.com
199.47.217.68	A	edge-block-api.dropbox-dns.com
199.47.217.69	A	j2nvietnam.com
199.47.217.69	A	agroinfoserv.com
199.47.217.97	A	block-sjc.dropbox-dns.com
199.47.217.97	A	dl-client33.dropbox.com
199.47.217.97	A	dl-client94.dropbox.com
199.47.217.139	A	sjc-ns2.dropbox.com
199.47.217.139	A	ns02.dropbox.com
199.47.217.142	PTR	sjc-nginx4.sjc.dropbox.com
199.47.217.144	PTR	ash-ra116-4b.sjc.dropbox.com
199.47.217.147	PTR	sjc-ra116-4d.sjc.dropbox.com
199.47.218.141	A	sjc-latte1.sjc.dropbox.com
199.47.218.143	A	sjc-analyticsbatch1.sjc.dropbox.com
199.47.218.145	A	sjc-dbbp1.sjc.dropbox.com
199.47.218.147	PTR	sjc-ra111-7b.sjc.dropbox.com
199.47.218.159	PTR	v-client-4a.sjc.dropbox.com
199.47.218.162	A	sjc-dbbp7.sjc.dropbox.com
199.47.218.166	A+PTR	sjc-batch3.sjc.dropbox.com
199.47.218.174	A	sjc-smtp3.sjc.dropbox.com