Robtex

Up: 80.21.0.0/18
Can't show all results, try to descend to a more specific CIDR
Down left: 80.21.0.0/20
Down right: 80.21.16.0/20
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
80.21.0.5	A	host5-0-static.21-80-b.business.telecomitalia.it
80.21.0.10	A	host10-0-static.21-80-b.business.telecomitalia.it
80.21.0.53	A	host53-0-static.21-80-b.business.telecomitalia.it
80.21.0.55	A	host55-0-static.21-80-b.business.telecomitalia.it
80.21.0.106	A	host106-0-static.21-80-b.business.telecomitalia.it
80.21.0.117	A	host117-0-static.21-80-b.business.telecomitalia.it
80.21.0.217	A	host217-0-static.21-80-b.business.telecomitalia.it
80.21.0.231	A	host231-0-static.21-80-b.business.telecomitalia.it
80.21.1.2	A	host2-1-static.21-80-b.business.telecomitalia.it
80.21.1.9	A	host9-1-static.21-80-b.business.telecomitalia.it
80.21.2.171	A	host171-2-static.21-80-b.business.telecomitalia.it
80.21.3.2	A+PTR	host2-3-static.21-80-b.business.telecomitalia.it
80.21.4.2	A	r-rm-acc-vl14.opb.interbusiness.it
80.21.7.54	A	r-rmpix-a.opb.interbusiness.it
80.21.11.14	A	host14-11-static.21-80-b.business.telecomitalia.it
80.21.11.17	A	host17-11-static.21-80-b.business.telecomitalia.it
80.21.11.19	A	host19-11-static.21-80-b.business.telecomitalia.it
80.21.11.25	A	host25-11-static.21-80-b.business.telecomitalia.it
80.21.11.47	A	host47-11-static.21-80-b.business.telecomitalia.it
80.21.11.58	A	host58-11-static.21-80-b.business.telecomitalia.it
80.21.11.60	A	host60-11-static.21-80-b.business.telecomitalia.it
80.21.11.61	A	host61-11-static.21-80-b.business.telecomitalia.it
80.21.11.64	A+PTR	host64-11-static.21-80-b.business.telecomitalia.it
80.21.11.65	A+PTR	host65-11-static.21-80-b.business.telecomitalia.it
80.21.11.75	A	host75-11-static.21-80-b.business.telecomitalia.it
80.21.11.81	A	host81-11-static.21-80-b.business.telecomitalia.it
80.21.11.97	A+PTR	host97-11-static.21-80-b.business.telecomitalia.it
80.21.11.99	A+PTR	host99-11-static.21-80-b.business.telecomitalia.it
80.21.11.100	A	host100-11-static.21-80-b.business.telecomitalia.it
80.21.11.105	A	host105-11-static.21-80-b.business.telecomitalia.it
80.21.11.129	A+PTR	host129-11-static.21-80-b.business.telecomitalia.it
80.21.11.132	A	host132-11-static.21-80-b.business.telecomitalia.it
80.21.11.135	A	host135-11-static.21-80-b.business.telecomitalia.it
80.21.11.139	A	host139-11-static.21-80-b.business.telecomitalia.it
80.21.11.162	A+PTR	host162-11-static.21-80-b.business.telecomitalia.it
80.21.11.167	A	host167-11-static.21-80-b.business.telecomitalia.it
80.21.11.176	A	host176-11-static.21-80-b.business.telecomitalia.it
80.21.11.180	A	mx1.pho.it
80.21.11.198	A	host198-11-static.21-80-b.business.telecomitalia.it
80.21.11.208	A	host208-11-static.21-80-b.business.telecomitalia.it
80.21.11.210	A	host210-11-static.21-80-b.business.telecomitalia.it
80.21.11.211	A	host211-11-static.21-80-b.business.telecomitalia.it
80.21.11.227	A+PTR	host227-11-static.21-80-b.business.telecomitalia.it
80.21.11.232	A	host232-11-static.21-80-b.business.telecomitalia.it
80.21.11.233	A	host233-11-static.21-80-b.business.telecomitalia.it
80.21.11.240	A	host240-11-static.21-80-b.business.telecomitalia.it
80.21.12.178	A	dda.netgatespace.com
80.21.12.211	A	mail.innovamedica.com
80.21.13.206	A	mail.aliserio.it
80.21.13.206	A	mail.euroflyservice.it
80.21.14.3	A+PTR	host3-14-static.21-80-b.business.telecomitalia.it
80.21.14.84	A	internet.dispensalogistics.it
80.21.14.135	A	exchange.fiorito.net
80.21.14.135	A	mail.wbagroup.eu
80.21.14.135	A	mail.wbagency.it
80.21.14.147	A	host147-14-static.21-80-b.business.telecomitalia.it
80.21.14.186	A	host186-14-static.21-80-b.business.telecomitalia.it
80.21.14.219	A	mail.carbosint.com
80.21.16.35	A+PTR	host35-16-static.21-80-b.business.telecomitalia.it
80.21.16.43	A	srvmail.manroland.it
80.21.16.43	A	mail.manroland.it
80.21.16.149	A	host149-16-static.21-80-b.business.telecomitalia.it
80.21.16.176	A	host176-16-static.21-80-b.business.telecomitalia.it
80.21.16.201	A	host201-16-static.21-80-b.business.telecomitalia.it
80.21.16.251	A	riparazioni360.com
80.21.17.37	A	host37-17-static.21-80-b.business.telecomitalia.it
80.21.17.68	A	host68-17-static.21-80-b.business.telecomitalia.it
80.21.17.226	A+PTR	host226-17-static.21-80-b.business.telecomitalia.it
80.21.17.228	A	host228-17-static.21-80-b.business.telecomitalia.it
80.21.17.235	A	host235-17-static.21-80-b.business.telecomitalia.it
80.21.24.3	A+PTR	host3-24-static.21-80-b.business.telecomitalia.it
80.21.24.3	A	smtp.ttrinstitute.com
80.21.24.3	A	smtp.ttrinstitute.eu
80.21.24.131	A+PTR	mail.intertraco.it
80.21.24.131	A	host131-24-static.21-80-b.business.telecomitalia.it
80.21.24.131	A	mail.bpi-hydraulik.com
80.21.24.133	A	mail.4s-tech.it
80.21.24.164	A	mail.villaerba.it
80.21.24.179	A	gecosystem.it
80.21.24.179	A	gecosystem.com
80.21.24.190	A	mail2.castiglionisrl.com
80.21.24.210	A	mail.fontesantonio.com
80.21.24.210	A	mail.refrescoitaly.com
80.21.24.210	A	mail.acquasantantonio.com
80.21.24.227	A	mail.bwi.it
80.21.24.243	A	consorzio.net
80.21.24.243	A	tracteur.net
80.21.24.243	A	paolillo.net
80.21.25.146	A	mail2.aziendafeltrina-serviziallapersona.it
80.21.25.198	A	sophie.ps.lnf.it
80.21.31.2	A	host2-31-static.21-80-b.business.telecomitalia.it
80.21.31.78	A	host78-31-static.21-80-b.business.telecomitalia.it
80.21.31.78	A	mail.decastelli.com
80.21.31.78	A	mx.celatosrl.com
80.21.31.114	A	exchange.omas-srl.net
80.21.31.114	A	ext.omas-srl.net