Robtex

Up: 168.83.64.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 168.83.64.0/23
Down right: 168.83.66.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
168.83.64.2	PTR	ns1.senado.gov.ar
168.83.64.2	A+PTR	senado.senado.gov.ar
168.83.64.2	A	senado.senado.gob.ar
168.83.64.3	PTR	relay.senado.gov.ar
168.83.64.9	A+PTR	www.senado.gov.ar
168.83.64.9	A	calcagno.senado.gov.ar
168.83.64.9	A	oac.senado.gov.ar