Italy

IP address space, AS numbers and the largest networks registered in Italy, based on the delegation records of the regional internet registries.

IPv4 addresses

53M

3,720 blocks

IPv6 allocations

1,070

AS numbers

1,318

Routed AS numbers

1,114

Largest networks in Italy

By announced prefixes

AS	Name	IPv4 prefixes	IPv6 prefixes
AS20746	ASN-IDC Telecom Italia S.p.A.	337	6
AS3269	ASN-IBSNAZ Telecom Italia S.p.A.	323	1
AS210218	OpenFiber-Italy Open Fiber S.P.A.	315	2
AS6762	SEABONE-NET TELECOM ITALIA SPARKLE S.p.A.	291	13
AS30722	VODAFONE-IT-ASN Fastweb SpA	284	3
AS29286	SKYLOGIC-AS SKYLOGIC S.P.A.	262	11
AS1267	ASN-WINDTRE WIND TRE S.P.A.	223	2
AS198471	OPNET-AS Opnet Srl	206	1
AS12663	VODAFONE-GROUP Fastweb SpA	173	2
AS50316	NET_GLOBAL_SRL Net Global Srl	130	1
AS12874	FASTWEB Fastweb SpA	110	18
AS213677	FIBERCOP Fibercop S.p.A.	118	3
AS31638	ASN-LEPIDA Lepida S.c.p.A.	111	2
AS202870	as_dimensione Dimensione S.r.l.	95	10
AS31034	ARUBA-ASN Aruba S.p.A.	98	5
AS64445	AS-NETJOIN NetJoin srl	91	5
AS137		83	2
AS3242	ASN-ITNET REEVO S.P.A.	64	6
AS47217	PLANETEL-SPA Planetel SPA	66	3
AS31115	INTRED-AS INTRED S.p.A.	65	1
AS30848	IT-TWT-AS UNIDATA S.p.A.	65	1
AS44831	INSIEL-AS Insiel- Informatica per il sistema degli enti locali S.p.A	58	2
AS48544	TECNOADSL-AS Tecnotel Servizi Tecnologici srl	58	0
AS21309	CASAWEB-AS HERABIT S.p.A.	56	1
AS3302	AS-RETELIT-IRIDEOS Retelit Digital Services S.p.A.	54	3
AS47902	ISP-INASSET-AS Retelit Digital Services S.p.A.	50	2
AS28716	RETELIT-AS Retelit Digital Services S.p.A.	47	5
AS203059	VION-AS Consorzio Energetico Val Venosta Soc. Coop.	50	1
AS12637	SEEWEB SEEWEB s.r.l.	36	10
AS51185	MAINSTREAMING-AS MainStreaming SpA	24	21

Delegations by registry: RIPE 4,771, ARIN 10, APNIC 9. Updated 2026-10-04.