Robtex

Up: 206.136.32.0/22
Can't show all results, try to descend to a more specific CIDR
Down left: 206.136.32.0/24
Down right: 206.136.33.0/24
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
206.136.32.17	A+PTR	storysyn.ngs.org
206.136.32.29	A+PTR	spi.ngs.org
206.136.32.66	PTR	www.ngsimages.com
206.136.32.66	A	ngsimages.com
206.136.32.66	A	www.nationalgeographicstock.com
206.136.32.74	A	vblogger.ngs.org
206.136.32.77	A	ngconnectonline.org
206.136.32.79	A	ngconnectonline.com
206.136.32.87	A	ftp.ngtlibrary.com
206.136.32.100	A+PTR	ps-mobile.ngs.org
206.136.32.150	PTR	web.ngs.org
206.136.32.164	A+PTR	bsdftptest.ngs.org