Robtex

Up: 191.212.0.0/15
Can't show all results, try to descend to a more specific CIDR
Down left: 191.213.0.0/17
Down right: 191.213.128.0/17

IP	Type	Hostname
191.213.4.2	PTR	191-213-4-2.host.telemar.net.br
191.213.5.2	PTR	191-213-5-2.host.telemar.net.br
191.213.10.2	A+PTR	191-213-10-2.host.telemar.net.br
191.213.11.2	A+PTR	191-213-11-2.host.telemar.net.br
191.213.11.202	PTR	191-213-11-202.host.telemar.net.br
191.213.21.2	A+PTR	191-213-21-2.user3g.veloxzone.com.br
191.213.23.92	PTR	191-213-23-92.host.telemar.net.br
191.213.27.2	PTR	191-213-27-2.host.telemar.net.br
191.213.28.2	A+PTR	191-213-28-2.host.telemar.net.br
191.213.31.2	A+PTR	191-213-31-2.host.telemar.net.br
191.213.33.86	PTR	191-213-33-86.host.telemar.net.br
191.213.34.2	PTR	191-213-34-2.host.telemar.net.br
191.213.35.2	A+PTR	191-213-35-2.host.telemar.net.br
191.213.36.2	PTR	191-213-36-2.host.telemar.net.br
191.213.38.2	A+PTR	191-213-38-2.user3g.veloxzone.com.br
191.213.43.238	A+PTR	191-213-43-238.user3g.veloxzone.com.br
191.213.95.116	A+PTR	191-213-95-116.user3g.veloxzone.com.br
191.213.139.238	A+PTR	191-213-139-238.user3g.veloxzone.com.br
191.213.161.7	PTR	191-213-161-7.host.telemar.net.br
191.213.162.161	A+PTR	191-213-162-161.user3g.veloxzone.com.br
191.213.163.238	A+PTR	191-213-163-238.user3g.veloxzone.com.br
191.213.170.234	A+PTR	191-213-170-234.user3g.veloxzone.com.br
191.213.171.110	A+PTR	191-213-171-110.user3g.veloxzone.com.br
191.213.171.166	A+PTR	191-213-171-166.user3g.veloxzone.com.br
191.213.171.206	A+PTR	191-213-171-206.user3g.veloxzone.com.br
191.213.171.230	A+PTR	191-213-171-230.user3g.veloxzone.com.br
191.213.174.13	PTR	191-213-174-13.host.telemar.net.br
191.213.175.238	A+PTR	191-213-175-238.user3g.veloxzone.com.br
191.213.187.238	A+PTR	191-213-187-238.user3g.veloxzone.com.br
191.213.227.55	PTR	191-213-227-55.host.telemar.net.br
191.213.235.238	A+PTR	191-213-235-238.user3g.veloxzone.com.br