Robtex

Up: 179.188.16.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 179.188.24.0/22
Down right: 179.188.28.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
179.188.27.194	A	smtp.r7.email.locaweb.com.br
179.188.28.15	A	globomail.locaweb.com.br
179.188.28.16	A	globomail.locaweb.com.br
179.188.28.17	A	mail.globo.locaweb.com.br
179.188.28.18	A	mail.globo.locaweb.com.br
179.188.28.42	A	chuck0037.globo.correio.biz
179.188.28.47	A	api-mail.globo.locaweb.com.br
179.188.28.48	A	api-mail.globo.locaweb.com.br
179.188.28.89	A	api-mail.globo.locaweb.com.br
179.188.28.90	A	globomail.locaweb.com.br
179.188.28.91	A	mail.globo.locaweb.com.br
179.188.28.120	A+PTR	backendqa0001.globo.correio.biz
179.188.28.120	A	mx.globoi.locaweb.com.br
179.188.28.126	A+PTR	autoconfig.globo.correio.biz
179.188.28.126	A	autodiscover.globo.locaweb.com.br
179.188.28.159	A	webmail.pearson.locaweb.com.br
179.188.28.169	A	webmail.pearson.locaweb.com.br
179.188.29.67	A	imap.globo.locaweb.com.br
179.188.29.67	A	smtp.globo.locaweb.com.br
179.188.29.67	A	pop.globo.locaweb.com.br
179.188.30.16	A+PTR	relay-179-188-30-16.globo.com
179.188.30.25	A+PTR	relay-179-188-30-25.globo.com
179.188.30.92	A+PTR	relay-179-188-30-92.globo.com
179.188.30.112	A+PTR	relay-179-188-30-112.globo.com
179.188.30.182	PTR	relay-179-188-30-182.globo.com
179.188.30.225	A+PTR	relay-179-188-30-225.globo.com
179.188.30.234	A+PTR	relay-179-188-30-234.globo.com
179.188.30.235	A+PTR	relay-179-188-30-235.globo.com
179.188.30.236	A+PTR	relay-179-188-30-236.globo.com
179.188.30.243	A	relay-179-188-30-243.globo.com