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AS45139Microsoft Corp

JapanRegistryAPNIC

As of 10th November 2026, AS45139 (Microsoft Corp), a network registered in Japan with APNIC, originates 2 IPv4 prefixes covering 768 addresses and 2 IPv6 prefixes. By IPv4 address space that makes it the 45,664th-largest of the 80,733 networks we see originating IPv4, and the 579th-largest of 737 in Japan. It is seen behind 3 upstream networks, most often AS9498 (Bharti Airtel Ltd.) and AS4755 (TATA Communications (formerly VSNL)). Every one of its announcements has a valid RPKI ROA, and none are RPKI-invalid. 100% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

2

IPv6 prefixes

2

IPv4 addresses

768

IPv6 /64s

131k

Upstream graph

The networks AS45139 is seen behind, one and two hops out, drawn from real AS paths.

AS45139Toward the internet core
Upstream graph for AS45139: 9 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS45139Microsoft CorpThis networkAS4755TATA Communicatio…AS9498Bharti Airtel Ltd.AS55410Vodafone Idea LtdAS6453TATA Communicatio…AS35280F5 Networks SARLAS3491PCCW Global (HK) …AS6939Hurricane Electri…AS1273Vodafone Group PLCAS1299Arelion (fka. Tel…

Networks observed one and two hops upstream of AS45139 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

6

adjacent networks

Upstreams
350%
Peers
350%
Downstreams
00%

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

Upstreams of AS45139
NetworkCountryRelationshipPathsVantage pts
AS9498Bharti Airtel Ltd.INPeer267138
AS4755TATA Communications (formerly VSNL)INPeer66
AS55410Vodafone Idea LtdINPeer55

Prefixes

The largest blocks AS45139 originates, widest first.

Largest prefixes originated by AS45139
PrefixAddressesVisibility
167.220.226.0/2351276/76
167.220.227.0/2425676/76
2404:f801:8020::/4865.5k × /6463/63
2404:f801:802c::/4865.5k × /6463/63

Routing health

How AS45139'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%4
  • Invalid0.0%0
  • No ROA0.0%0

Propagation

  • Globally propagated90% of full-feed peers or more100.0%4
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 2 prefixes

IPv6 — 2 prefixes

  • /4865.5k × /64100.0%2

Recent changes

Announcements that started or stopped since 12th Oct 2026.

No announcement by AS45139 started or stopped in this period.

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