Robtex

Up: 91.231.164.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 91.231.164.0/25
Down right: 91.231.164.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
91.231.164.1	A+PTR	core1.waveconn.it
91.231.164.4	PTR	esx2.waveconn.it
91.231.164.10	A+PTR	ns1.waveconn.it
91.231.164.10	A	dnswcon1.positivonet.it
91.231.164.11	A+PTR	ns2.waveconn.it
91.231.164.11	A	dnswcon2.positivonet.it
91.231.164.13	PTR	91-231-164-13.libradsl.it
91.231.164.13	A	ns4.waveconn.it
91.231.164.16	PTR	websrv1.waveconn.it
91.231.164.16	A	plastimetalsrl.com
91.231.164.16	A	kaleidostone.com
91.231.164.66	A+PTR	ican.waveconn.it
91.231.164.106	PTR	mail.libradsl.it
91.231.164.106	PTR	outlook.libradsl.it
91.231.164.250	PTR	mail.libradsl.it