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AS3598Microsoft Corporation

United StatesRegistryARIN

As of 12th November 2026, AS3598 (Microsoft Corporation), a network registered in the United States with ARIN, originates 18 IPv4 prefixes covering 610k addresses and 5 IPv6 prefixes. By IPv4 address space that makes it the 636th-largest of the 80,772 networks we see originating IPv4, and the 153rd-largest of 18,759 in the United States. It is seen behind 5 upstream networks, most often AS8075 (Microsoft Corporation) and AS3356 (Lumen (Level 3)). 91% 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

18

IPv6 prefixes

5

IPv4 addresses

610k

IPv6 /64s

12.9B

Upstream graph

The networks AS3598 is seen behind, one and two hops out, drawn from real AS paths.

AS3598Toward the internet core
Upstream graph for AS3598: 12 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS3598Microsoft Corpora…This networkAS1680Cellcom Fixed Lin…AS2686AT&T Enterprises,…AS3356Lumen (Level 3)AS8075Microsoft Corpora…AS12849Hot-Net internet …AS42013Together Communic…AS7018AT&T Enterprises,…AS2914NTT America, Inc.AS3549Lumen (fka. Globa…AS6453TATA Communicatio…AS2497Internet Initiati…AS35280F5 Networks SARL

Networks observed one and two hops upstream of AS3598 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

10

adjacent networks

Upstreams
550%
Peers
550%
Downstreams
00%

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

Upstreams of AS3598
NetworkCountryRelationshipPathsVantage pts
AS8075Microsoft CorporationUSPeer1,042142
AS3356Lumen (Level 3)USPeer39878
AS2686AT&T Enterprises, LLCUSPeer141141
AS1680Cellcom Fixed Line Communication L.PILPeer135135
AS12849Hot-Net internet services Ltd.ILPeer77

Prefixes

The largest blocks AS3598 originates, widest first.

Largest prefixes originated by AS3598
PrefixAddressesVisibility
65.53.0.0/1665.5k78/78
131.107.0.0/1665.5k78/78
157.54.0.0/1665.5k78/78
157.57.0.0/1665.5k78/78
157.58.0.0/1665.5k78/78
157.59.0.0/1665.5k78/78
157.60.0.0/1665.5k78/78
167.220.0.0/1665.5k78/78
167.220.0.0/1732.8k78/78
167.220.128.0/1816.4k78/78

Routing health

How AS3598'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

  • Valid91.3%21
  • Invalid0.0%0
  • No ROA8.7%2

Propagation

  • Globally propagated90% of full-feed peers or more100.0%23
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 18 prefixes

IPv6 — 5 prefixes

  • /324.3B × /6460.0%3
  • /4865.5k × /6440.0%2

Recent changes

Announcements that started or stopped since 13th Oct 2026.

No announcement by AS3598 started or stopped in this period.

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