Robtex

Up: 201.216.220.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 201.216.220.0/25
Down right: 201.216.220.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
201.216.220.10	PTR	customer-static-201-216-220.10.iplannetworks.net
201.216.220.18	PTR	efrasmx01.efra.com.ar
201.216.220.23	PTR	customer-static-201-216-220.23.iplannetworks.net
201.216.220.25	A+PTR	atlantida1.atlantida.com.ar
201.216.220.25	A	mx1.billiken.com.ar
201.216.220.25	A	mx1.atlantida.com.ar
201.216.220.29	PTR	mail.admail.com.ar
201.216.220.29	A	mail.atlantidalibros.com.ar
201.216.220.30	PTR	customer-static-201-216-220.30.iplannetworks.net
201.216.220.51	PTR	customer-static-201-216-220.51.iplannetworks.net
201.216.220.53	PTR	customer-static-201-216-220.53.iplannetworks.net
201.216.220.59	PTR	customer-static-201-216-220.59.iplannetworks.net
201.216.220.65	PTR	customer-static-201-216-220.65.iplannetworks.net
201.216.220.69	PTR	customer-static-201-216-220.69.iplannetworks.net
201.216.220.69	A	mx.tsoft.es
201.216.220.69	A	mx.tsoftlatam.com
201.216.220.75	PTR	customer-static-201-216-220.75.iplannetworks.net
201.216.220.76	PTR	customer-static-201-216-220.76.iplannetworks.net
201.216.220.81	PTR	customer-static-201-216-220.81.iplannetworks.net
201.216.220.91	PTR	customer-static-201-216-220.91.iplannetworks.net
201.216.220.98	PTR	customer-static-201-216-220.98.iplannetworks.net
201.216.220.127	PTR	customer-static-201-216-220.127.iplannetworks.net
201.216.220.129	PTR	customer-static-201-216-220.129.iplannetworks.net
201.216.220.159	PTR	customer-static-201-216-220.159.iplannetworks.net
201.216.220.167	PTR	customer-static-201-216-220.167.iplannetworks.net
201.216.220.182	PTR	customer-static-201-216-220.182.iplannetworks.net
201.216.220.194	PTR	customer-static-201-216-220.194.iplannetworks.net
201.216.220.198	PTR	customer-static-201-216-220.198.iplannetworks.net
201.216.220.206	PTR	customer-static-201-216-220.206.iplannetworks.net
201.216.220.221	PTR	mx.cofa.org.ar
201.216.220.223	PTR	customer-static-201-216-220.223.iplannetworks.net
201.216.220.225	PTR	marrac.com.ar
201.216.220.225	PTR	mail.marrac.com.ar
201.216.220.226	PTR	customer-static-201-216-220.226.iplannetworks.net
201.216.220.230	PTR	customer-static-201-216-220.230.iplannetworks.net
201.216.220.231	PTR	customer-static-201-216-220.231.iplannetworks.net
201.216.220.241	PTR	customer-static-201-216-220.241.iplannetworks.net
201.216.220.246	PTR	customer-static-201-216-220.246.iplannetworks.net
201.216.220.249	A+PTR	mail.cservices.com.ar