Robtex

Up: 46.31.104.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 46.31.104.0/23
Down right: 46.31.106.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
46.31.104.204	A+PTR	mx1.activenetwork.it
46.31.104.205	A	pop.activenetwork.it
46.31.104.205	A	pop3.activenetwork.it
46.31.104.205	A	imap.activenetwork.it
46.31.104.208	A+PTR	resolver1.activenetwork.it
46.31.104.209	A+PTR	resolver2.activenetwork.it
46.31.104.211	A+PTR	auth1.activenetwork.it
46.31.104.211	A	ns1.activenetwork.it
46.31.104.212	A	ns2.activenetwork.it
46.31.104.213	A+PTR	auth2.activenetwork.it
46.31.104.218	A+PTR	out1.new-smtp.activenetwork.it
46.31.104.219	A+PTR	out2.new-smtp.activenetwork.it
46.31.104.220	A+PTR	new-smtp.activenetwork.it
46.31.104.221	A+PTR	new-smtp.activenetwork.it
46.31.104.228	A	smtpauth.activenetwork.it
46.31.104.248	A+PTR	voipdev.activenetwork.it
46.31.105.14	A	voip.activenetwork.it
46.31.105.30	A+PTR	bmx1.activenetwork.it
46.31.105.34	A+PTR	actmail007.activenetwork.it
46.31.105.35	PTR	actmail007.activenetwork.it
46.31.105.35	A	mx.beactive.it
46.31.105.35	A	h-mx1.activenetwork.it
46.31.105.36	A	mail.cittadiviterbo.com
46.31.105.36	A	mail.beactive.it
46.31.105.36	A	mail.wooowfast.it
46.31.105.47	A	megadsl.it
46.31.105.47	A	voiparlate.it
46.31.105.47	A	www.megadsl.it
46.31.105.49	A	www.beactive.it
46.31.105.49	A	www.activenetwork.it
46.31.105.49	A	beactive.it
46.31.106.139	A	moikltygaasev.ooo
46.31.107.69	A+PTR	ip-69-107.sn1.activenetwork.it
46.31.107.69	A	mail.studiolegaledesioquercia.it
46.31.107.95	A+PTR	ip-95-107.sn1.activenetwork.it
46.31.107.162	A+PTR	ip-162-107.sn1.activenetwork.it
46.31.107.162	A	giottoruote.it
46.31.107.217	PTR	ip-217-107.sn1.activenetwork.it