Robtex

Up: 31.3.168.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 31.3.172.0/23
Down right: 31.3.174.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
31.3.172.180	A+PTR	31_3_172_180.ip.cesenanet.net
31.3.172.180	A	www.canginibenne.com
31.3.173.86	A	mail3.neri.biz
31.3.173.87	A+PTR	31_3_173_087.ip.cesenanet.net
31.3.173.87	A	nerinorthamerica.com
31.3.173.202	PTR	mail.imperfettolab.com
31.3.173.212	A+PTR	31_3_173_212.ip.cesenanet.net
31.3.173.212	A	www.duratel.it
31.3.173.212	A	ferb.it
31.3.174.2	A	vpn.alpi.it
31.3.174.3	PTR	mail.alpiwood.com
31.3.174.3	PTR	mail.alpi.it
31.3.174.3	A	mx2.alpitimber.com
31.3.174.4	A	crm.alpi.it
31.3.174.5	A	imap.alpitimber.com
31.3.174.66	A+PTR	mail.aurel.it
31.3.174.66	A	mail.aurelautomation.com
31.3.174.102	A	mail.mbmangimi.it
31.3.174.121	A+PTR	posta.sampierana.com
31.3.174.121	A	posta.eurocomach.com
31.3.174.121	A	webmail.sampierana.com
31.3.174.122	PTR	31_3_174_122.ip.cesenanet.net
31.3.174.122	A	sampieranaspareparts.com
31.3.174.140	A+PTR	31_3_174_140.ip.cesenanet.net
31.3.174.140	A	mail.uemme.com
31.3.175.138	A	soundchess.net
31.3.175.138	A	tamtamstudio.com
31.3.175.138	A	mail.tamtamstudio.com
31.3.175.140	A+PTR	31_3_175_140.ip.cesenanet.net
31.3.175.140	A	soundchess.net
31.3.175.164	A	sermec.com
31.3.175.180	A	mail.casadeighinassi.com