subnet.im

AS12874Fastweb SpA

ItalyRegistryRIPE NCCTypeEyeball

As of 27th September 2026, AS12874 (Fastweb SpA), an access network registered in Italy with RIPE NCC, originates 110 IPv4 prefixes covering 7.4M addresses and 18 IPv6 prefixes. By IPv4 address space that makes it the 96th-largest of the 79,525 networks we see originating IPv4, and the 3rd-largest of 1,075 in Italy. It is seen behind 40 upstream networks, most often AS1299 (Arelion (fka. Telia Carrier)) and AS3303 (Swisscom (Schweiz) AG), and in front of 208 downstream networks. 77% of its announcements have a valid RPKI ROA, and none are RPKI-invalid. 87% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

110

IPv6 prefixes

18

IPv4 addresses

7.4M

IPv6 /64s

42.9B

Upstream graph

The networks AS12874 is seen behind, one and two hops out, drawn from real AS paths.

AS12874Toward the internet core
Upstream graph for AS12874: 12 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS12874Fastweb SpAThis networkAS1299Arelion (fka. Tel…AS3303Swisscom (Schweiz…AS3356Lumen (Level 3)AS9002RETN LimitedAS32590Valve CorporationAS8888xTom Pty LtdAS13030Init7 (Switzerlan…AS2914NTT America, Inc.AS3549Lumen (fka. Globa…AS6939Hurricane Electri…AS6453TATA Communicatio…AS51907Kanton Zug

Networks observed one and two hops upstream of AS12874 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

595

adjacent networks

Upstreams
407%
Peers
34758%
Downstreams
20835%

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

Upstreams of AS12874
NetworkCountryRelationshipPathsVantage pts
AS1299Arelion (fka. Telia Carrier)SEPeer13,18861
AS3303Swisscom (Schweiz) AGCHPeer12,476113
AS3356Lumen (Level 3)USPeer12,10783
AS9002RETN LimitedGBPeer2,76614
AS32590Valve CorporationUSPeer2,0164
AS6762Telecom Italia Sparkle (Seabone)ITPeer1,95347
AS13030Init7 (Switzerland) Ltd.CHPeer1,7444
AS14537Continent 8 LLCUSPeer1,6114
AS6667Elisa OyjFIPeer1,5384
AS1273Vodafone Group PLCEUPeer1,33743

Prefixes

All 128

The largest blocks AS12874 originates, widest first.

Largest prefixes originated by AS12874
PrefixAddressesVisibility
93.32.0.0/121M80/81
2.224.0.0/13524k80/81
2.232.0.0/13524k80/81
93.32.0.0/13524k80/81
93.40.0.0/13524k80/81
93.48.0.0/13524k80/81
93.32.0.0/14262k73/81
93.36.0.0/14262k81/81
93.40.0.0/14262k73/81
93.44.0.0/14262k73/81

Routing health

How AS12874'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

  • Valid76.6%98
  • Invalid0.0%0
  • No ROA23.4%30

Propagation

  • Globally propagated90% of full-feed peers or more86.7%111
  • Partially propagated40% to 90%13.3%17
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 110 prefixes

IPv6 — 18 prefixes

  • /2934.4B × /645.6%1
  • /324.3B × /645.6%1
  • /36268M × /6488.9%16

Recent changes

Announcements that started or stopped since 28th Aug 2026.

No announcement by AS12874 started or stopped in this period.

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