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AS12663Fastweb SpA

ItalyRegistryRIPE NCC

As of 25th October 2026, AS12663 (Fastweb SpA), a network registered in Italy with RIPE NCC, originates 172 IPv4 prefixes covering 511k addresses and 2 IPv6 prefixes. By IPv4 address space that makes it the 714th-largest of the 79,675 networks we see originating IPv4, and the 13th-largest of 1,080 in Italy. It is seen behind 1 upstream network, most often AS1273 (Vodafone Group PLC). Every one of its announcements has a valid RPKI ROA, and none are RPKI-invalid. 98% of its routes reach at least 90% of full-feed peers, and 3 prefixes are also originated by another network.

At a glance

IPv4 prefixes

172

IPv6 prefixes

2

IPv4 addresses

511k

IPv6 /64s

2.1M

Upstream graph

The networks AS12663 is seen behind, one and two hops out, drawn from real AS paths.

AS12663Toward the internet core
Upstream graph for AS12663: 3 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS12663Fastweb SpAThis networkAS1273Vodafone Group PLCAS6667Elisa OyjAS41811CONVERGENCE (GROU…

Networks observed one and two hops upstream of AS12663 in real AS paths. A thicker line means more vantage points saw that adjacency, so weight tracks how well attested it is — not how much traffic it carries. Adjacency is an observation; whether it is a transit purchase or a settlement-free peering is an inference, and is labelled as one wherever we show it.

Neighbouring networks

2

adjacent networks

Upstreams
150%
Peers
150%
Downstreams
00%

Networks carrying this one's traffic toward the rest of the internet.

Upstreams of AS12663
NetworkCountryRelationshipPathsVantage pts
AS1273Vodafone Group PLCEUPeer13,010138

Prefixes

All 174

The largest blocks AS12663 originates, widest first.

Largest prefixes originated by AS12663
PrefixAddressesVisibility
46.108.0.0/1665.5k76/76
145.230.0.0/1665.5k76/76
195.233.0.0/1665.5k14/76
37.25.128.0/1732.8k14/76
46.190.128.0/1732.8k76/76
192.125.128.0/1732.8k76/76
195.232.128.0/1732.8k76/76
108.179.64.0/1816.4k76/76
130.195.128.0/1816.4k76/76
139.47.192.0/1816.4k15/76

Routing health

How AS12663's own announcements validate against RPKI and how far they propagate. The same measures for the whole routing table are on the routing table in numbers.

RPKI origin validation

  • Valid100.0%174
  • Invalid0.0%0
  • No ROA0.0%0

Propagation

  • Globally propagated90% of full-feed peers or more98.3%171
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%1.7%3

Prefix sizes

IPv4 — 172 prefixes

IPv6 — 2 prefixes

  • /441M × /64100.0%2

Recent changes

Announcements that started or stopped since 25th Sept 2026.

No announcement by AS12663 started or stopped in this period.

Routing data derived from RouteViews MRT archives, BGPKIT relationship inference and public registry data.