Robtex

Up: 198.179.48.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 198.179.52.0/23
Down right: 198.179.54.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
198.179.52.1	A	edge-rtr.upmtelecom.com
198.179.52.1	A	ns1.upmtelecom.com
198.179.53.4	PTR	application.upmtelecom.com
198.179.53.4	A	mail.upmplaza.com
198.179.53.4	A	mail.upmtelecom.com
198.179.53.42	A	upmplazasuites.com
198.179.53.42	A	pennydial.net
198.179.53.42	A	sachnoionline.org
198.179.53.90	A	upmtechnology.com
198.179.53.90	A	nocagent.com