AS8075 Microsoft Corporation — ASN Info Lookup

AS8075Microsoft CorporationIDC

WHOIS Topology

United States · ARINmicrosoft.com

Hosts top sitesAnycastCritical infrastructureRPKI filteringTor relaysVPS hosting

IPv4 addresses

81,114,880

1,229 announced prefixes

IPv6 addresses

1.10 × 10³¹

122 announced prefixes

BGP neighbours

…

CAIDA rank

#3,075

Customer cone 8 ASNs

Estimated users

341K

APNIC Labs estimate

RPKI

98% valid

2 invalid · 23 not covered

Average purity

3,929 sampled IPs

IXPs / facilities

207 / 167

Operator self-reported

History

How prefixes were announced and changed hands, registration changes, and outage or hijack incidents.

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IP ranges

Currently announced prefixes with their RIR registration and geolocation.

Prefix	RPKI	Registration	Geolocation	Addresses
20.64.0.0/10	Valid	—	San Antonio	4,194,304
20.192.0.0/10	Valid	—	Pune	4,194,304
13.64.0.0/11	Valid	—	San Jose	2,097,152
20.0.0.0/11	Valid	—	London	2,097,152
48.224.0.0/11	Valid	UK-MICROSOFT-19901207RIPE	United Kingdom	2,097,152
52.160.0.0/11	Valid	—	San Jose	2,097,152
52.224.0.0/11	Valid	—	Dulles	2,097,152
107.32.0.0/11	Valid	UK-MICROSOFT-20101110RIPE	United Kingdom	2,097,152
172.128.0.0/11	Valid	UK-MICROSOFT-20000324RIPE	HyderabadCross-border	2,097,152
172.160.0.0/11	Valid	UK-MICROSOFT-20000324RIPE	SwedenCross-border	2,097,152
4.144.0.0/12	Valid	—	Hong Kong	1,048,576
4.160.0.0/12	Valid	—	Campinas	1,048,576
4.176.0.0/12	Valid	—	Paris	1,048,576
4.192.0.0/12	Valid	—	Hong Kong	1,048,576
4.208.0.0/12	Valid	—	Dublin	1,048,576
4.224.0.0/12	Valid	—	Pune	1,048,576
4.240.0.0/12	Valid	—	Pune	1,048,576
20.48.0.0/12	Valid	—	Tokyo	1,048,576
20.160.0.0/12	Valid	—	Amsterdam	1,048,576
40.80.0.0/12	Valid	—	London	1,048,576

Only the first 500 prefixes are listed; address counts and geography use all prefixes.

/24 block profile

One square per /24: colour shows the risk type, shade how many addresses are flagged, stripes mark datacenter blocks. Click a square to see all 256 addresses.

/24s with data 7,306 / 316,855 （2%） · flagged 5,945

No risk flagsDatacenter (no flags)ProxyVPNAbuse / blocklistTorDarker = more flagged addresses; dashed = block screen only

20.192.0.0/101206/16384 with data · 927 flagged

20.64.0.0/101104/16384 with data · 927 flagged

20.0.0.0/11347/8192 with data · 270 flagged

172.160.0.0/11300/8192 with data · 278 flagged

20.48.0.0/12251/4096 with data · 220 flagged

20.160.0.0/12231/4096 with data · 220 flagged

52.160.0.0/11223/8192 with data · 202 flagged

4.192.0.0/12201/4096 with data · 113 flagged

13.64.0.0/11199/8192 with data · 115 flagged

20.40.0.0/13169/2048 with data · 135 flagged

52.224.0.0/11148/8192 with data · 120 flagged

40.80.0.0/12138/4096 with data · 94 flagged

Hover a square for its numbers; click to see all 256 addresses.

Each prefix shows its 64 /24s with the most data. Built daily from lookups, neighbour sampling, public lists and block screening.

IP reputation

IPs from this network that CleanIP has analysed: purity, abuse reports and the riskiest /24 blocks.

Purity distribution

85–100 870–84 2,61350–69 1,0500–49 258

0.08%

Share of IPv4 reported or blocklisted

66,409

Listed IPs

3,929

Analysed IPs

Riskiest /24 blocks

/24 block	Flagged	Analysed
130.33.140.0/24	5	11
20.65.194.0/24	5	5
4.252.172.0/24	4	11
23.97.62.0/24	3	6
13.89.125.0/24	3	3
135.237.125.0/24	3	3
20.163.15.0/24	3	3
20.169.106.0/24	3	3
20.210.76.0/24	3	3
20.64.105.0/24	3	3

Flagged = VPN, proxy, Tor or purity below 50. Samples come from user lookups and neighbour sampling, not every address in this network.

Geography

Where this network’s IPv4 addresses are located.

United States32.9%
United Kingdom30.8%
Netherlands6.6%
India3.7%
Japan2.5%
Singapore2.4%

Scope: Global
In registered country: 32.9%

Estimated by sampling IPv4 ranges against a geolocation database.

Traffic observation

AS8075 · Last 7 days

Mobile vs. Desktop

Desktop87.8%Mobile12.2%

Adoption & Usage

Adoption and usage of key protocols

Internet Protocol (IP) Version

IPv499.6%IPv60.4%

HTTP Version

HTTP/1.x

66.7%HTTP/2

31.1%HTTP/3

2.1%

BGP Announcements

Hourly BGP route announcements over the last 7 days

67,158,216

7-day total

4,641,174

Hourly peak

Data: Cloudflare Radar, licensed under CC BY-NC 4.0

Activity

Hourly traffic over the last 7 days, normalized to this network’s peak.

Fairly flat around the clock, typical of server or hosting networks.

	00						06						12						18
Mon
Tue
Wed
Thu
Fri
Sat
Sun

Times in UTCLessMore

Peak hour: 14:00–15:00
Active hours: 24 hrs
Weekend vs weekday: Weekdays heavier
Busiest day: Thu

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BGP upstreams and neighbours

AS8075Standalone page

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WHOIS record

The registry’s record for this AS number: holder, status, dates and contacts.

Sources

Where the information on this page comes from and when it was updated.

Information	Source	Updated
Registered country	RIR daily delegation statistics	2026-10-20
Registered address & allocation date	RIR registration data (RDAP)	2026-09-26
Organization & company country	AS-to-organization data	2026-10-21
Network type	CleanIP ASN canon	2026-10-21
Exchanges & facilities	Operator self-reported interconnection data	2026-10-21
Announced prefixes & BGP neighbours	Public BGP routing data	2026-10-21
IPv4 geography	Geolocation database	—
RPKI validation	RPKI ROA validation data	2026-10-21
Rank & customer cone	CAIDA AS Rank	2026-10-01
Estimated users (APNIC)	APNIC Labs user estimates	2026-10-19
Network tags	Public routing data community tags	2026-10-21
IP reputation	CleanIP lookups and neighbour sampling	—

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Multi-source cross-checks · In-house reputation data · Real data only