AS39729 REGISTER-AS REGISTER S.P.A.

IPv4 addresses11,26416 prefixes · <0.001% of announced IPv4

Rank in Italy#127largest network in IT by IPv4 space, of 1,081 · 0.02% of IT

Rank worldwide#8,562of 79,396 networks with IPv4

IPv64,096 x /481 prefixes

CountryItaly1,121 ASNs registered there

Open AS39729 in ASN lookup Look up an IP in this network (81.88.48.1) All networks in Italy

IPv4 prefixes

All 16 prefixes, in address order.

81.88.48.0/21
81.88.56.0/23
81.88.58.0/24
81.88.59.0/24
81.88.60.0/22
185.2.4.0/23
185.2.6.0/24
185.2.7.0/24
185.110.66.0/23
195.110.100.0/22
195.110.104.0/23
195.110.107.0/24
195.110.112.0/24
195.110.118.0/23
195.110.120.0/21
213.158.80.0/22

IPv6 prefixes

All 1 prefix.

2a01:8100:2000::/36

Similar-sized networks in Italy

ASNNameIPv4 addresses

AS9137#124 ASN-UNO Uno Communications SpA11,264

AS61079#125 DIGI-IT Digi Italy S.R.L.11,264

AS199883#126 ARUBACLOUDLTD-ASN Aruba S.p.A.11,264

AS60798#128 ASSERVEREASY Servereasy Srl11,008

AS48815#129 CriticalCase CriticalCase s.r.l11,008

AS206617#130 NEOMEDIA Neomedia S.r.l.10,752

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