Robtex

Up: 204.8.134.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 204.8.135.0/25
Down right: 204.8.135.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
204.8.135.3	PTR	mhebenefits.com
204.8.135.3	A+PTR	mhfibenefits.com
204.8.135.3	A	mcgrawhillbenefits.com
204.8.135.10	A+PTR	dmzrelay01.spglobal.com
204.8.135.10	A	mghwebt1.com
204.8.135.17	PTR	ccssgames.com
204.8.135.17	PTR	earlychildhoodconnection.com
204.8.135.17	PTR	glencoemcgrawhill.com
204.8.135.42	A	mheclrn.com
204.8.135.42	A	mcgrawhillcsi.com
204.8.135.43	A	mcgrawhillbusinesslaw.com
204.8.135.44	A+PTR	mcgrawhillintrotobusiness.com
204.8.135.47	A	mcgrawhillmarketing.com
204.8.135.48	A	mcgrawhillmanagement.com
204.8.135.60	A+PTR	edxewdc.standardandpoors.com
204.8.135.61	A	edxuat.standardandpoors.com
204.8.135.70	A	ftps-edx.standardandpoors.com
204.8.135.72	PTR	connect.mheducation.ca
204.8.135.72	A+PTR	moodle.mheducation.ca
204.8.135.107	A	nutritioncalc.ca
204.8.135.110	PTR	inspirewithmhls.com
204.8.135.110	PTR	inventwithmhls.com
204.8.135.110	A	creativeagencyonline.com
204.8.135.115	A	ftp.platts.com
204.8.135.167	A	mcgraw-hillanswers.com
204.8.135.174	PTR	mhheshopqa.com
204.8.135.174	PTR	shopqa.mcgraw-hill.com
204.8.135.174	PTR	qa.segconnect.com
204.8.135.175	A	mhheshopdev.com
204.8.135.193	A+PTR	segrep.com
204.8.135.193	A	mheskys.com
204.8.135.217	A+PTR	levelsaustralia.com
204.8.135.217	A+PTR	levelsaustralia.com.au
204.8.135.217	A	bioedlinks.com
204.8.135.219	PTR	computing2011.com
204.8.135.219	PTR	computing2013.com
204.8.135.219	A+PTR	computing2014.com
204.8.135.228	A	mcgraw-hillshop.com
204.8.135.228	A	shopmcgraw-hill.com
204.8.135.228	A	mcgrawhillshop.com
204.8.135.229	A+PTR	search-ew.mcgraw-hill.com