AS21056 ASN-WELCOMEITALIA Vianova S.p.A

ASN-WELCOMEITALIA Vianova S.p.A · registered in Italy

IPv4 addresses98,81638 prefixes · 0.003% of announced IPv4

Rank in Italy#24largest network in IT by IPv4 space, of 1,081 · 0.19% of IT

Rank worldwide#1,900of 79,396 networks with IPv4

IPv61 x /32 (65,536 x /48)1 prefixes

CountryItaly1,121 ASNs registered there

Open AS21056 in ASN lookup Look up an IP in this network (45.84.140.1) All networks in Italy

IPv4 prefixes

All 38 prefixes, in address order.

45.84.140.0/22
45.143.36.0/22
45.151.12.0/22
45.151.64.0/22
46.44.192.0/18
78.152.96.0/19
79.108.136.0/21
79.135.32.0/19
80.93.128.0/20
83.137.56.0/21
87.232.160.0/19
87.247.232.0/21
91.143.192.0/20
91.201.104.0/24
91.242.230.0/24
94.138.160.0/19
103.26.124.0/22
103.43.232.0/22
103.61.184.0/22
103.248.184.0/22
109.122.208.0/21
144.48.192.0/22
185.97.216.0/22
185.125.64.0/22
185.158.116.0/22
185.170.36.0/22
185.224.60.0/22
185.224.104.0/22
185.230.92.0/22
185.230.192.0/22
185.230.232.0/22
185.231.160.0/22
185.234.164.0/22
185.241.20.0/22
188.240.32.0/22
193.124.240.0/22
194.58.216.0/22
213.182.64.0/19

IPv6 prefixes

All 1 prefix.

2a00:14f8::/32

Similar-sized networks in Italy

ASNNameIPv4 addresses

AS198471#21 OPNET-AS Opnet Srl143,104

AS30848#22 IT-TWT-AS UNIDATA S.p.A.122,880

AS31263#23 MYNET-AS MYNET S.R.L.101,888

AS12797#25 ASN-ATLANET RETELIT-X S.R.L.98,816

AS5394#26 Unidata UNIDATA S.p.A.91,904

AS3242#27 ASN-ITNET REEVO S.P.A.86,784

IP-to-ASN data: iptoasn.com (public domain). Snapshot downloaded 2026-11-11, refreshed daily. Ranges are what each network announces in BGP, not registry allocations. Data sources