Robtex

Up: 178.23.200.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 178.23.204.0/23
Down right: 178.23.206.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
178.23.204.185	PTR	host185-204.net23-178.net.connetti.it
178.23.204.203	PTR	host203-204.net23-178.net.connetti.it
178.23.205.73	PTR	host73-205.net23-178.net.connetti.it
178.23.205.73	A	connetti.saipenne.it
178.23.205.137	PTR	host137-205.net23-178.net.connetti.it
178.23.205.157	PTR	host157-205.net23-178.net.connetti.it
178.23.205.212	PTR	host212-205.net23-178.net.connetti.it
178.23.205.223	PTR	host223-205.net23-178.net.connetti.it
178.23.205.223	A	fwac.barberini.eu
178.23.205.223	A	fwac.barberinieyewear.it
178.23.205.255	PTR	host255-205.net23-178.net.connetti.it
178.23.206.28	A	backup.gruppodeugenio.it
178.23.206.49	PTR	host49-206.net23-178.net.connetti.it
178.23.206.52	PTR	host52-206.net23-178.net.connetti.it
178.23.206.52	A	fwa.omagroup.it
178.23.206.54	A+PTR	relay.omagroup.it
178.23.206.88	PTR	host88-206.net23-178.net.connetti.it
178.23.206.115	PTR	host115-206.net23-178.net.connetti.it
178.23.206.136	PTR	host136-206.net23-178.net.connetti.it
178.23.206.150	PTR	host150-206.net23-178.net.connetti.it
178.23.206.164	PTR	host164-206.net23-178.net.connetti.it
178.23.206.178	PTR	host178-206.net23-178.net.connetti.it
178.23.206.223	PTR	host223-206.net23-178.net.connetti.it
178.23.206.226	PTR	host226-206.net23-178.net.connetti.it
178.23.206.255	PTR	host255-206.net23-178.net.connetti.it
178.23.207.0	PTR	host0-207.net23-178.net.connetti.it
178.23.207.107	PTR	host107-207.net23-178.net.connetti.it
178.23.207.167	PTR	host167-207.net23-178.net.connetti.it
178.23.207.167	A	ik6ihh.ddns.net
178.23.207.169	PTR	host169-207.net23-178.net.connetti.it
178.23.207.218	PTR	host218-207.net23-178.net.connetti.it
178.23.207.255	PTR	host255-207.net23-178.net.connetti.it