Robtex

Up: 199.255.40.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 199.255.44.0/23
Down right: 199.255.46.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
199.255.44.5	A+PTR	pat.hitachigst.com
199.255.44.5	A	sjc00ib2.hgst.com
199.255.44.9	A	usa.hitachigst.com
199.255.44.10	A	sjcpartextr2.hitachigst.com
199.255.44.13	A	drop.hgst.com
199.255.44.16	A	snjrelay02.hgst.com
199.255.44.17	A	snjrelay01.hgst.com
199.255.44.18	A	ssddom01.hgst.com
199.255.44.18	A	ssdstg02.hgst.com
199.255.44.21	PTR	fabrikultimatebackup.com
199.255.44.21	PTR	*.fabrikultimatebackup.com
199.255.44.21	PTR	www.simpletech.com
199.255.44.32	PTR	www.hitachigst.com
199.255.44.34	PTR	hgst.com
199.255.44.34	PTR	www.hgst.com
199.255.44.34	PTR	www3.hgst.com
199.255.44.36	A+PTR	sjc00mx1.hgst.com
199.255.44.36	A+PTR	sjc00mx1.hitachigst.com
199.255.44.37	A+PTR	sjc00mx2.hgst.com
199.255.44.37	A	sjc00mx2.hitachigst.com
199.255.44.41	PTR	www2.hgst.com
199.255.44.41	A	www.touropro.com
199.255.44.41	A	touropro.com
199.255.44.61	A+PTR	hgstcloud.com
199.255.44.82	A	b2btest.hgst.com
199.255.44.102	A+PTR	mail.cvc-hgst.com
199.255.44.250	A+PTR	rap-us.hgst.com
199.255.44.253	PTR	dns2.hgst.com
199.255.44.254	A+PTR	dns1.hgst.com
199.255.44.254	A+PTR	ns1.wdc.com
199.255.44.254	PTR	wdcns01.wdc.com
199.255.45.4	PTR	h199-255-45-4.hgst.com
199.255.45.50	A+PTR	dns2.hgst.com
199.255.45.50	A+PTR	ns2.wdc.com
199.255.45.56	A	cdp.wdc.com
199.255.45.71	A	appstore.wdc.com
199.255.45.78	A	datamakespossible.com
199.255.45.78	A	www.datamakespossible.com
199.255.45.118	PTR	h199-255-45-118.hgst.com
199.255.45.125	PTR	h199-255-45-125.hgst.com
199.255.47.6	PTR	h199-255-47-6.hgst.com
199.255.47.11	PTR	h199-255-47-11.hgst.com
199.255.47.12	PTR	h199-255-47-12.hgst.com
199.255.47.15	PTR	dns3.hgst.com
199.255.47.15	PTR	h199-255-47-15.hgst.com
199.255.47.30	PTR	h199-255-47-30.hgst.com