Robtex

Up: 177.152.200.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 177.152.204.0/23
Down right: 177.152.206.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
177.152.204.0	PTR	mta01.acsstmta.com
177.152.206.192	PTR	mta65.insightmediapost.com
177.152.206.223	A+PTR	mta32.spdmpost.com
177.152.207.0	A+PTR	mta01.insightmediamta.com
177.152.207.6	A	mta07.insightmediamta.com
177.152.207.20	A	mta21.insightmediamta.com
177.152.207.21	A	mta22.insightmediamta.com
177.152.207.22	A	mta23.insightmediamta.com
177.152.207.25	A+PTR	mta26.insightmediamta.com
177.152.207.26	A	mta27.insightmediamta.com
177.152.207.224	A	mx.convergecompost.com.br
177.152.207.224	A	mx.defatomta.com
177.152.207.224	A	mx.boleiapost.com.br