1. All IP Ranges
  2. 138.0.0.0/8
  3. 138.91.0.0/16
  4. AS8075  | 138.91.0.0/16

138.91.0.0/16

AS8075  ·  Microsoft Corporation

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Summary

Country United States
Domain microsoft.com
ASN AS8075
Registry ARIN
ID MICROSOFT

WHOIS Details

NetHandle:      NET-138-91-0-0-1
OrgID:          MSFT-Z
Parent:         NET-138-0-0-0-0
NetName:        MICROSOFT
NetRange:       138.91.0.0 - 138.91.255.255
NetType:        allocation
RegDate:        2011-06-22
Updated:        2021-12-14
Source:         ARIN


OrgID:          MSFT-Z
OrgName:        Microsoft Corp
CanAllocate:    
Street:         One Microsoft Way
City:           Redmond
State/Prov:     WA
Country:        US
PostalCode:     98052
Comment:        To report suspected security issues specific to 
Comment:        traffic emanating from Microsoft online services, 
Comment:        including the distribution of malicious content 
Comment:        or other illicit or illegal material through a 
Comment:        Microsoft online service, please submit reports 
Comment:        to:
Comment:        * https://cert.microsoft.com.  
Comment:        For SPAM and other abuse issues, such as Microsoft 
Comment:        Accounts, please contact:
Comment:        * abuse@microsoft.com.  
Comment:        To report security vulnerabilities in Microsoft 
Comment:        products and services, please contact:
Comment:        * secure@microsoft.com.  
Comment:        For legal and law enforcement-related requests, 
Comment:        please contact:
Comment:        * msndcc@microsoft.com
Comment:        For routing, peering or DNS issues, please 
Comment:        contact:
Comment:        * IOC@microsoft.com
RegDate:        2011-06-22
Updated:        2025-06-10
OrgAdminHandle: IPHOS5-ARIN
OrgTechHandle:  BEDAR6-ARIN
OrgTechHandle:  IPHOS5-ARIN
OrgTechHandle:  MRPD-ARIN
OrgTechHandle:  SINGH683-ARIN
OrgAbuseHandle: MAC74-ARIN
OrgRoutingHandle:   CHATU3-ARIN
Source:         ARIN


POCHandle:      SINGH683-ARIN
IsRole:         N
LastName:       Singh
FirstName:      Prachi
Street:         1 Microsoft Way
City:           Redmond
State/Prov:     WA
Country:        US
PostalCode:     98052
RegDate:        2023-06-13
Updated:        2023-07-11
OfficePhone:    +1-425-707-5601
Mailbox:        pracsin@microsoft.com
Source:         ARIN


POCHandle:      IPHOS5-ARIN
IsRole:         N
LastName:       IPHostmaster
FirstName:      IPHostmaster
Street:         One Microsoft Way
City:           Redmond
State/Prov:     WA
Country:        US
PostalCode:     20147
RegDate:        2021-10-13
Updated:        2025-10-21
OfficePhone:    +1-425-538-6637
Mailbox:        iphostmaster@microsoft.com
Source:         ARIN


POCHandle:      MRPD-ARIN
IsRole:         Y
LastName:       Microsoft Routing, Peering, and DNS
FirstName:      
Street:         One Microsoft Way
City:           Redmond
State/Prov:     WA
Country:        US
PostalCode:     98052
RegDate:        2013-08-20
Updated:        2025-10-16
OfficePhone:    +1-425-882-8080
Mailbox:        IOC@microsoft.com
Source:         ARIN


POCHandle:      BEDAR6-ARIN
IsRole:         N
LastName:       Bedard
FirstName:      Dawn
Street:         1 Redmond Way
City:           Redmond
State/Prov:     WA
Country:        US
PostalCode:     98052
RegDate:        2016-10-20
Updated:        2025-08-19
OfficePhone:    +1-425-538-6637
Mailbox:        dabedard@microsoft.com
Source:         ARIN


POCHandle:      MAC74-ARIN
IsRole:         Y
LastName:       Microsoft Abuse Contact
FirstName:      
Street:         One Microsoft Way
City:           Redmond
State/Prov:     WA
Country:        US
PostalCode:     98052
RegDate:        2013-08-20
Updated:        2025-06-10
OfficePhone:    +1-425-882-8080
Mailbox:        abuse@microsoft.com
Source:         ARIN

Nearby Ranges

BGP prefixes that overlap with 138.0.0.0/8

Range ASN Company Num of IPs
138.67.0.0/16 AS36704 Colorado School of Mines 65,536
138.98.0.0/16 AS68 Los Alamos National Laboratory 65,536
138.116.0.0/16 AS33004 SUNY Empire State University 65,536
138.210.0.0/16 AS29817 CenturyLink Communications, LLC 65,536
138.64.0.0/16 AS4685 ASAHI Net,Inc. 65,536
138.123.0.0/16 AS46887 Delaware Technical Community College 65,536
138.37.0.0/16 AS198864 Queen Mary University of London 65,536
138.51.0.0/16 AS239 University of Toronto 65,536
138.47.0.0/16 AS19564 Louisiana Tech University 65,536
138.115.0.0/16 AS270 National Aeronautics and Space Administration 65,536
138.26.0.0/16 AS3452 University of Alabama at Birmingham - University Computer Center 65,536
138.201.0.0/16 AS24940 Server Block 65,536
138.225.0.0/16 AS20868 ABB Information Systems Ltd 65,536
138.195.0.0/16 AS212424 CENTRALESUPELEC 65,536
138.210.0.0/16 AS11398 CenturyLink Communications, LLC 65,536
138.63.0.0/16 AS1715 Centre Europeen de Recherches et Formation Avancee en Calcul Scientifique 65,536
138.231.0.0/16 AS2269 Ecole Normale Superieure Paris-Saclay EPSCP 65,536
138.29.0.0/16 AS22742 Coast Guard Academy 65,536
138.22.0.0/16 AS1853 GeoSphere Austria 65,536
138.236.0.0/16 AS17234 Gustavus Adolphus College 65,536
138.9.0.0/16 AS18663 University of the Pacific 65,536
138.247.0.0/16 AS23122 Dakota State University 65,536
138.106.0.0/16 AS202116 SCANIA CV AB 65,536
138.90.0.0/16 AS16509 Amazon.com, Inc. 65,536
138.132.0.0/16 AS20746 Italtel SPA 65,536
138.240.0.0/16 AS16509 Amazon.com, Inc. 65,536
138.220.0.0/16 AS10497 IBRD 65,536
138.70.0.0/16 AS16509 Amazon.com, Inc. 65,536
138.52.0.0/16 AS16509 Amazon.com, Inc. 65,536
138.130.0.0/16 AS1221 Telstra Limited 65,536
138.217.0.0/16 AS1221 Telstra Limited 65,536
138.189.0.0/16 AS12511 Post CH AG 65,536
138.191.0.0/16 AS12511 Post CH AG 65,536
138.246.0.0/16 AS12816 Ludwig-Maximilians-Universitaet Muenchen 65,536
138.15.0.0/16 AS10753 NEC Laboratories America, Inc. 65,536
138.102.0.0/16 AS2200 INRAE 65,536
138.111.0.0/16 AS16509 Amazon Technologies Inc. 65,536
138.195.0.0/16 AS2200 CENTRALESUPELEC 65,536
138.92.0.0/16 AS11482 Canisius College 65,536
138.101.0.0/16 AS16509 Nikkei Inc. 65,536
138.27.0.0/16 AS1540 Headquarters, USAISC 65,536
138.86.0.0/16 AS15295 University of Northern Colorado 65,536
138.103.0.0/16 AS15830 AB Sandvik 65,536
138.50.0.0/16 AS1565 Headquarters, USAISC 65,536
138.41.0.0/16 AS137 DIR-GARR - Roma 65,536
138.237.0.0/16 AS18791 Texas Christian University 65,536
138.232.0.0/16 AS1110 University of Innsbruck 65,536
138.34.0.0/16 AS16509 Amazon.com, Inc. 65,536
138.210.0.0/16 AS14921 CenturyLink Communications, LLC 65,536
138.168.0.0/16 AS721 MARINE CORPS CYBERSPACE OPERATIONS GROUP 65,536

Hosted domains

There are 2,486 domain names hosted across 470 IP addresses on this ASN. Checkout our API to access full domain hosting information.

IP Address Domain Domains on this IP
138.91.107.244 group7.net 347
138.91.225.40 powerplatformconf.com 210
138.91.104.194 e-and-bservices.com 165
138.91.0.30 kusakawa.tokyo 108
138.91.16.18 ffsky.cn 106
138.91.126.145 buildabasket.com 97
138.91.124.215 defensealliance.com 83
138.91.240.81 teresis.com 64
138.91.112.90 smithers.com 55
138.91.138.247 zellwegeranalytics.info 46
138.91.142.25 arteriorstoo.com 36
138.91.182.195 truscore.com 34
138.91.73.99 nwpa.com.au 32
138.91.38.205 lemarcheretail.com 31
138.91.187.181 newoaksai.com 29
138.91.91.83 inscobottle.com 29
138.91.235.8 hbqzcrane.com 28
138.91.75.159 omnixi.com 28
138.91.239.54 fincenboifile.co 28
138.91.56.36 scout-di.com 23

Hosted domains API

Our Hosted Domains API, or Reverse IP API returns a full list of domains that are hosted on a single IP address.
Useful for Cybersecurity
Read more

Pingable IPs

5,768 IPs in this range replied to an ICMP ping during our most recent internet scan. Learn more.

IP Address ASN Details
138.91.106.94 AS8075 Microsoft Corporation 0.46ms from Ashburn, US
138.91.123.54 AS8075 Microsoft Corporation 0.45ms from Ashburn, US
138.91.21.241 AS8075 Microsoft Corporation 0.30ms from Osaka, JP
138.91.226.4 AS8075 Microsoft Corporation 0.54ms from San Jose, US
138.91.147.77 AS8075 Microsoft Corporation 0.55ms from San Jose, US
138.91.95.155 AS8075 Microsoft Corporation 0.61ms from San Jose, US
138.91.249.56 AS8075 Microsoft Corporation 0.57ms from San Jose, US
138.91.189.76 AS8075 Microsoft Corporation 0.57ms from San Jose, US
138.91.87.71 AS8075 Microsoft Corporation 0.61ms from San Jose, US
138.91.35.25 AS8075 Microsoft Corporation 0.50ms from Singapore, SG
138.91.61.152 AS8075 Microsoft Corporation 0.23ms from Dublin, IE
138.91.23.2 AS8075 Microsoft Corporation 0.32ms from Osaka, JP
138.91.239.147 AS8075 Microsoft Corporation 0.65ms from San Jose, US
138.91.166.200 AS8075 Microsoft Corporation 0.55ms from San Jose, US
138.91.152.44 AS8075 Microsoft Corporation 0.60ms from San Jose, US
138.91.104.106 AS8075 Microsoft Corporation 0.44ms from Ashburn, US
138.91.31.73 AS8075 Microsoft Corporation 0.41ms from Osaka, JP
138.91.229.48 AS8075 Microsoft Corporation 0.57ms from San Jose, US
138.91.198.95 AS8075 Microsoft Corporation 0.56ms from San Jose, US
138.91.143.11 AS8075 Microsoft Corporation 0.57ms from San Jose, US
138.91.137.24 AS8075 Microsoft Corporation 0.56ms from San Jose, US
138.91.37.32 AS8075 Microsoft Corporation 0.46ms from Singapore, SG
138.91.44.35 AS8075 Microsoft Corporation 0.65ms from Singapore, SG
138.91.10.7 AS8075 Microsoft Corporation 0.52ms from Tokyo, JP
138.91.107.230 AS8075 Microsoft Corporation 0.44ms from Ashburn, US

Other Pingable IPs

Below is a random selection of 25 IPs that replied to an ICMP ping during our most recent internet scan.

IP Address ASN Details
94.189.253.224 AS31042 Serbia BroadBand-Srpske Kablovske mreze d.o.o. 6.43ms from Belgrade, RS
52.89.84.160 AS16509 Amazon.com, Inc. 0.18ms from Boardman, US
62.66.182.240 AS9158 Telenor A/S 1.58ms from Copenhagen, DK
138.252.34.16 AS154297 PROCAPITUS BUSINESS PARK PRIVATE LIMITED 1.21ms from Delhi, IN
189.135.111.0 AS8151 UNINET 11.77ms from Guadalajara, MX
66.214.229.16 AS20115 Charter Communications LLC 4.41ms from Los Angeles, US
61.130.155.64 AS4134 CHINANET-BACKBONE 6.28ms from Nanchang, CN
179.135.158.128 AS26599 TELEFÔNICA BRASIL S.A 2.14ms from Osasco, BR
27.201.203.64 AS4837 CHINA UNICOM China169 Backbone 5.22ms from Qingdao, CN
189.130.180.16 AS8151 UNINET 4.10ms from Santiago de Queretaro, MX
204.29.105.112 AS3464 Alabama Supercomputer Authority 5.34ms from Atlanta, US
50.91.136.208 AS33363 Charter Communications, Inc 6.49ms from Los Angeles, US
16.50.106.208 AS16509 Amazon.com, Inc. 0.58ms from Melbourne, AU
174.48.71.112 AS7922 Comcast Cable Communications, LLC 4.67ms from Miami, US
15.206.120.224 AS16509 Amazon.com, Inc. 0.11ms from Mumbai, IN
128.84.3.160 AS26 Cornell University 6.14ms from New York City, US
126.28.138.48 AS17676 SoftBank Corp. 2.91ms from Osaka, JP
61.101.79.64 AS9318 SK Broadband Co Ltd 1.35ms from Seoul, KR
140.119.119.112 AS1659 Taiwan Academic Network (TANet) Information Center 2.66ms from Taipei, TW
193.171.40.16 AS1853 ACONET 2.98ms from Vienna, AT
197.205.90.128 AS36947 Telecom Algeria 19.61ms from Algiers, DZ
13.220.187.0 AS14618 Amazon.com, Inc. 0.58ms from Ashburn, US
32.208.106.64 AS46690 Southern New England Telephone Company and SNET America, Inc. 12.79ms from Ashburn, US
62.38.241.144 AS3329 VODAFONE-PANAFON HELLENIC TELECOMMUNICATIONS COMPANY SA 1.50ms from Athens, GR
35.133.159.48 AS20115 Charter Communications LLC 6.78ms from Atlanta, US

Traceroute

Below is a recent traceroute taken from the IPinfo ProbeNet to an IP in this range. Learn more.

$
traceroute -a -n -q1 -f4 -m8 138.91.8.179
traceroute to 138.91.8.179 (138.91.8.179): 8 hops max, 52 byte packets
4 [AS8075] 104.44.197.187 32.631 ms
5 [AS8075] 104.44.235.234 32.811 ms
6 *
7 *
8 *
Measurement taken from IPinfo ProbeNet in Helsinki, FI
On

What are IP address ranges?

IP address ranges, or netblocks, are groups of related IP addresses. They are usually represented as a base IP address, followed by a slash, and then a netmask which represents how many IP addresses are contained within the netblock. This format is known as CIDR. You'll also sometimes see netblocks given as a start ip address, and an end ip address, or an ip address range.

Traffic works its way around the internet based on the routing table, which contains a list of networks and their associated netblocks.

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