subnet.im

AS8075Microsoft Corporation

United StatesRegistryARINTypeContent

As of 26th September 2026, AS8075 (Microsoft Corporation), a content network registered in the United States with ARIN, originates 1,210 IPv4 prefixes covering 81.8M addresses and 116 IPv6 prefixes. By IPv4 address space that makes it the 5th-largest of the 79,480 networks we see originating IPv4, and the 4th-largest of 18,421 in the United States. It is seen behind 83 upstream networks, most often AS6453 (TATA Communications (America) Inc) and AS35280 (F5 Networks SARL), and in front of 7 downstream networks. 98% of its announcements have a valid RPKI ROA; 1 is RPKI-invalid. 98% of its routes reach at least 90% of full-feed peers, and 5 prefixes are also originated by another network.

At a glance

IPv4 prefixes

1,210

IPv6 prefixes

116

IPv4 addresses

81.8M

IPv6 /64s

602B

Upstream graph

The networks AS8075 is seen behind, one and two hops out, drawn from real AS paths.

AS8075Toward the internet core
Upstream graph for AS8075: 10 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS8075Microsoft Corpora…This networkAS2497Internet Initiati…AS2914NTT America, Inc.AS4755TATA Communicatio…AS6453TATA Communicatio…AS35280F5 Networks SARLAS3130RGnet OUAS49544i3D.net B.VAS1299Arelion (fka. Tel…AS8220COLTAS32590Valve Corporation

Networks observed one and two hops upstream of AS8075 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

520

adjacent networks

Upstreams
8316%
Peers
43083%
Downstreams
71%

Networks carrying this one's traffic toward the rest of the internet. Listing the 40 seen on the most AS paths, of 83.

Upstreams of AS8075
NetworkCountryRelationshipPathsVantage pts
AS6453TATA Communications (America) IncUSPeer4,88523
AS35280F5 Networks SARLFRPeer4,6036
AS2914NTT America, Inc.USPeer4,44910
AS4755TATA Communications (formerly VSNL)INPeer4,39080
AS2497Internet Initiative Japan Inc.JPPeer4,2405
AS1299Arelion (fka. Telia Carrier)SEPeer3,95261
AS6939Hurricane Electric LLCUSPeer3,51815
AS9002RETN LimitedGBPeer3,1298
AS49544i3D.net B.VNLPeer3,1234
AS6667Elisa OyjFIPeer3,0744

Prefixes

All 1,326

The largest blocks AS8075 originates, widest first.

Largest prefixes originated by AS8075
PrefixAddressesVisibility
20.64.0.0/104.2M80/81
20.192.0.0/104.2M80/81
13.64.0.0/112.1M80/81
20.0.0.0/112.1M80/81
48.224.0.0/112.1M80/81
52.160.0.0/112.1M80/81
52.224.0.0/112.1M80/81
107.32.0.0/112.1M80/81
172.128.0.0/112.1M80/81
172.160.0.0/112.1M80/81

Routing health

How AS8075'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

  • Valid98.2%1,302
  • Invalid<0.1%1
  • No ROA1.7%23

Propagation

  • Globally propagated90% of full-feed peers or more97.5%1,293
  • Partially propagated40% to 90%0.2%2
  • Seen by few peersUnder 40%2.3%31

Prefix sizes

IPv4 — 1,210 prefixes

IPv6 — 116 prefixes

  • /25550B × /640.9%1
  • /2934.4B × /640.9%1
  • /318.6B × /640.9%1
  • /324.3B × /641.7%2
  • /36268M × /643.4%4
  • /45524k × /640.9%1
  • /4865.5k × /6491.4%106

Recent changes

Announcements that started or stopped since 27th Aug 2026.

37 announced and 4 withdrawn in all; the most recent are shown.

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