Robtex

Up: 72.44.0.0/19
Can't show all results, try to descend to a more specific CIDR
Down left: 72.44.16.0/21
Down right: 72.44.24.0/21
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
72.44.20.2	A+PTR	2-20-44-72.gserv.net
72.44.20.18	PTR	webmail.gserv.net
72.44.20.18	A	ns1.gserv.net
72.44.20.18	A	pop.webmail.gserv.net
72.44.20.19	PTR	ns2.gserv.net
72.44.20.21	PTR	host-maua.gserv.net
72.44.21.179	PTR	globalnet.srv.br
72.44.21.179	A	179-21-44-72.gserv.net
72.44.21.207	PTR	globalnet.srv.br
72.44.21.219	A+PTR	219-21-44-72.gserv.net
72.44.23.33	PTR	globalnet.srv.br
72.44.23.33	A	instagram.fgru14-1.fna.fbcdn.net
72.44.23.233	A+PTR	233-23-44-72.gserv.net
72.44.23.233	A	www.connectmax.com.br
72.44.24.18	A	correio2.cooperativapindorama.com.br
72.44.28.242	PTR	72.44.28-242.fiberinternet.com.br
72.44.28.242	A	eclipsepr.com.br