Robtex

Up: 72.236.24.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 72.236.28.0/23
Down right: 72.236.30.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
72.236.28.2	A+PTR	hypr21tunnel.hypertherm.com
72.236.28.3	PTR	mdmnh1.hypertherm.com
72.236.28.4	A+PTR	ftp.hypertherm.com
72.236.28.5	A+PTR	xnet.hypertherm.com
72.236.28.7	PTR	hypertherm.com
72.236.28.7	A	www.hyperthermcam.com
72.236.28.7	A	www.hypertherm.com
72.236.28.9	A+PTR	enterprise.hypertherm.com
72.236.28.10	PTR	b2bdev.hypertherm.com
72.236.28.11	PTR	b2b.hypertherm.com
72.236.28.12	PTR	hyperthermautomation.com
72.236.28.12	PTR	hynet.hypertherm.com
72.236.28.13	PTR	ocs.hypertherm.com
72.236.28.15	A+PTR	ecatalog.centricut.com
72.236.28.15	A	xnet.hypertherm.com
72.236.28.15	A	hyperthermautomation.com
72.236.28.16	PTR	centricut.com
72.236.28.16	PTR	htdoc.hypertherm.com
72.236.28.18	A	ceip.hyperthermcam.com
72.236.28.20	PTR	helpme.hypertherm.com
72.236.28.20	A+PTR	sophosmr.hypertherm.com
72.236.28.22	PTR	ldweb.hypertherm.com
72.236.28.29	A	dialin.hypertherm.com