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AS12076Microsoft (Azure Customer Peering)

United StatesRegistryARIN

As of 10th November 2026, AS12076 (Microsoft (Azure Customer Peering)), a network registered in the United States with ARIN, originates 4 IPv4 prefixes covering 2.6k addresses and 6 IPv6 prefixes. By IPv4 address space that makes it the 23,457th-largest of the 80,733 networks we see originating IPv4, and the 5,882nd-largest of 18,751 in the United States. It is seen behind 2 upstream networks, most often AS5852 (United States Department of Defense…) and AS3477 (National Oceanic and Atmospheric…). 40% of its announcements have 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

4

IPv6 prefixes

6

IPv4 addresses

2.6k

IPv6 /64s

393k

Upstream graph

The networks AS12076 is seen behind, one and two hops out, drawn from real AS paths.

AS12076Toward the internet core
Upstream graph for AS12076: 5 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS12076Microsoft (Azure …This networkAS3477National Oceanic …AS5852United States Dep…AS11956National Oceanic …AS26100National Oceanic …AS27064Defense Informati…

Networks observed one and two hops upstream of AS12076 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

4

adjacent networks

Upstreams
250%
Peers
250%
Downstreams
00%

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

Upstreams of AS12076
NetworkCountryRelationshipPathsVantage pts
AS5852United States Department of Defense (DoD)USPeer37062
AS3477National Oceanic and Atmospheric AdministrationUSPeer30075

Prefixes

The largest blocks AS12076 originates, widest first.

Largest prefixes originated by AS12076
PrefixAddressesVisibility
151.207.40.0/221k75/76
151.207.44.0/221k75/76
204.193.239.0/2425675/76
204.193.240.0/2425675/76
2608:1c1::/4865.5k × /6461/63
2608:1c1:1::/4865.5k × /6462/63
2608:1c1:4::/4865.5k × /6461/63
2608:1c1:6::/4865.5k × /6462/63
2608:1c1:7::/4865.5k × /6462/63
2608:1c1:8::/4865.5k × /6462/63

Routing health

How AS12076'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

  • Valid40.0%4
  • Invalid0.0%0
  • No ROA60.0%6

Propagation

  • Globally propagated90% of full-feed peers or more100.0%10
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 4 prefixes

IPv6 — 6 prefixes

  • /4865.5k × /64100.0%6

Recent changes

Announcements that started or stopped since 12th Oct 2026.

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