1. All IP Ranges
  2. 51.0.0.0/8
  3. AS8075  | 51.104.0.0/15

51.104.0.0/15

AS8075  ·  Microsoft Corporation

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Summary

Country unknown
Domain microsoft.com
ASN AS8075
Registry RIPE
ID CLOUD

WHOIS Details

inetnum:        51.104.0.0 - 51.104.255.255
netname:        cloud
country:        EU
admin-c:        DH5439-RIPE
tech-c:         MRPA3-RIPE
status:         LEGACY
mnt-by:         MICROSOFT-MAINT
created:        2025-09-05T18:13:18Z
last-modified:  2025-09-05T18:13:18Z
source:         RIPE
abuse-email:    abuse@microsoft.com
abuse-c:        MAC274-RIPE
abuse-org:      ORG-MA42-RIPE

role:           Microsoft Routing, Peering, and DNS
address:        One Microsoft Way
address:        Redmond, WA 98052
e-mail:         ioc@microsoft.com
nic-hdl:        MRPA3-RIPE
mnt-by:         MICROSOFT-MAINT
created:        2014-08-26T16:25:24Z
last-modified:  2014-08-26T16:25:24Z
source:         RIPE

person:         Divya Quamara
address:        One Microsoft Way
address:        Redmond, WA 98052
phone:          +1-425-882-8080
nic-hdl:        DH5439-RIPE
mnt-by:         MICROSOFT-MAINT
created:        2014-08-26T16:24:14Z
last-modified:  2016-02-19T07:09:41Z
source:         RIPE

route:          51.104.0.0/15
origin:         AS8075
descr:          Microsoft
notify:         radb@microsoft.com
mnt-by:         MICROSOFT-MAINT
created:        2020-07-20T21:03:11Z
last-modified:  2020-07-20T21:03:11Z
source:         RIPE

Nearby Ranges

BGP prefixes that overlap with 51.0.0.0/8

Range ASN Company Num of IPs
51.186.0.0/15 AS5607 SKY UK Limited 131,072
51.176.0.0/15 AS16509 A100 ROW Inc 131,072
51.236.0.0/15 AS16509 A100 ROW Inc 131,072
51.182.0.0/15 AS5607 SKY UK Limited 131,072
51.158.0.0/15 AS12876 Scaleway 131,072
51.204.0.0/15 AS16509 A100 ROW Inc 131,072
51.220.0.0/15 AS16509 A100 ROW Inc 131,072
51.232.0.0/15 AS16509 A100 ROW Inc 131,072
51.34.0.0/15 AS16509 A100 Row Inc 131,072
51.174.0.0/15 AS29695 Altibox AS 131,072
51.6.0.0/15 AS6871 131,072
51.16.0.0/15 AS16509 A100 Row Inc 131,072
51.72.0.0/15 AS16509 A100 Row Inc 131,072
51.192.0.0/15 AS16509 A100 ROW Inc 131,072
51.208.0.0/15 AS16509 A100 ROW Inc 131,072
51.216.0.0/15 AS16509 A100 ROW Inc 131,072
51.226.0.0/15 AS16509 A100 Row Inc 131,072
51.228.0.0/15 AS16509 A100 ROW Inc 131,072
51.206.0.0/15 AS16509 A100 Row Inc 131,072
51.248.0.0/15 AS16509 A100 ROW Inc 131,072
51.48.0.0/15 AS16509 A100 ROW Inc 131,072
51.252.0.0/15 AS25019 Saudi Telecom Company JSC 131,072
51.188.0.0/15 AS16509 A100 ROW Inc 131,072
51.190.0.0/15 AS5607 SKY UK Limited 131,072
51.4.0.0/15 AS8075 Microsoft Deutschland MCIO GmbH 131,072
51.200.0.0/15 AS16509 A100 ROW Inc 131,072
51.196.0.0/15 AS16509 A100 ROW Inc 131,072
51.94.0.0/15 AS16509 A100 ROW Inc 131,072
51.156.0.0/15 AS16509 A100 Row Inc 131,072
51.122.0.0/15 AS16509 A100 Row Inc 131,072
51.164.0.0/15 AS16509 A100 ROW Inc 131,072
51.172.0.0/15 AS16509 A100 ROW Inc 131,072
51.212.0.0/15 AS16509 A100 ROW Inc 131,072
51.214.0.0/15 AS16509 A100 Row Inc 131,072
51.168.0.0/15 AS16509 A100 ROW Inc 131,072
51.224.0.0/15 AS16509 A100 ROW Inc 131,072
51.254.0.0/15 AS16276 OVH SAS 131,072
51.166.0.0/15 AS16509 A100 Row Inc 131,072
51.180.0.0/15 AS16509 A100 ROW Inc 131,072
51.202.0.0/15 AS16509 A100 Row Inc 131,072
51.184.0.0/15 AS16509 A100 ROW Inc 131,072
51.244.0.0/15 AS16509 A100 ROW Inc 131,072
51.125.0.0/16 AS16509 A100 ROW Inc 65,536
51.155.0.0/16 AS13037 Zen Internet Limited 65,536
51.160.0.0/16 AS16509 A100 ROW Inc 65,536
51.129.0.0/16 AS16509 A100 ROW Inc 65,536
51.148.0.0/16 AS13037 Zen Internet Limited 65,536
51.139.0.0/16 AS16509 A100 ROW Inc 65,536
51.118.0.0/16 AS16509 A100 ROW Inc 65,536
51.150.0.0/16 AS16509 A100 Row Inc 65,536

Hosted domains

There are 13,137 domain names hosted across 841 IP addresses on this ASN. Checkout our API to access full domain hosting information.

IP Address Domain Domains on this IP
51.105.228.104 intesasanpaolocasa.com 975
51.104.28.75 kennedyslaw.com 790
51.104.28.64 met.police.uk 613
51.104.28.68 ozola.co.uk 453
51.105.217.242 hookup-singles.com 453
51.104.28.65 imperial.nhs.uk 413
51.105.206.128 athleticpillow.de 387
51.104.28.78 nesfircroft.com 381
51.105.74.161 diversityrolemodels.org 337
51.104.28.67 pinsentmasons.com 295
51.104.28.69 taylorwimpey.co.uk 273
51.104.28.74 spiraxsarco.com 264
51.105.74.162 checkmystreet.co.uk 219
51.104.28.76 woburnmotors.co.uk 217
51.105.153.165 rheobyk.eu 211
51.104.28.70 casiocs.co.uk 211
51.104.28.85 oclvision.com 209
51.104.28.80 chapterlondon.cn 206
51.104.28.77 avamae.co.uk 204
51.105.74.160 blesma.org 200

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

20,335 IPs in this range replied to an ICMP ping during our most recent internet scan. Learn more.

IP Address ASN Details
51.104.191.209 AS8075 Microsoft Corporation 0.16ms from Dublin, IE
51.104.150.95 AS8075 Microsoft Corporation 0.14ms from Dublin, IE
51.105.72.80 AS8075 Microsoft Corporation 0.85ms from London, GB
51.104.250.22 AS8075 Microsoft Corporation 0.18ms from London, GB
51.104.210.209 AS8075 Microsoft Corporation 0.18ms from London, GB
51.105.35.167 AS8075 Microsoft Corporation 0.19ms from London, GB
51.105.54.118 AS8075 Microsoft Corporation 0.17ms from London, GB
51.104.217.50 AS8075 Microsoft Corporation 0.19ms from London, GB
51.105.103.10 AS8075 Microsoft Corporation 0.21ms from Amsterdam, NL
51.105.123.171 AS8075 Microsoft Corporation 0.22ms from Amsterdam, NL
51.105.120.210 AS8075 Microsoft Corporation 0.23ms from Amsterdam, NL
51.104.153.2 AS8075 Microsoft Corporation 0.15ms from Dublin, IE
51.104.175.249 AS8075 Microsoft Corporation 0.15ms from Dublin, IE
51.104.137.82 AS8075 Microsoft Corporation 0.15ms from Dublin, IE
51.104.99.252 AS8075 Microsoft Corporation 0.97ms from Dublin, IE
51.104.164.16 AS8075 Microsoft Corporation 0.15ms from Dublin, IE
51.105.93.122 AS8075 Microsoft Corporation 7.38ms from Geneve, CH
51.105.89.195 AS8075 Microsoft Corporation 7.37ms from Geneve, CH
51.104.219.165 AS8075 Microsoft Corporation 0.17ms from London, GB
51.105.56.62 AS8075 Microsoft Corporation 0.17ms from London, GB
51.105.28.47 AS8075 Microsoft Corporation 0.19ms from London, GB
51.104.234.4 AS8075 Microsoft Corporation 0.18ms from London, GB
51.105.73.104 AS8075 Microsoft Corporation 0.91ms from London, GB
51.105.117.255 AS8075 Microsoft Corporation 0.23ms from Amsterdam, NL
51.105.99.29 AS8075 Microsoft Corporation 0.22ms from Amsterdam, NL

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
69.250.46.95 AS7922 Comcast Cable Communications, LLC 6.97ms from Ashburn, US
69.173.70.223 AS46964 The Broad Institute, Inc. 1.29ms from Boston, US
192.8.210.255 AS24084 PLOT NO: 3A, SECTOR 126, SEZ, NOIDA 1.04ms from Chennai, IN
104.2.8.191 AS7018 AT&T Enterprises, LLC 8.96ms from Chicago, US
169.63.216.207 AS36351 IBM Cloud 0.84ms from Dallas, US
77.12.201.255 AS6805 Telefonica Germany GmbH & Co.OHG 2.65ms from Frankfurt am Main, DE
142.196.250.47 AS33363 Charter Communications, Inc 5.84ms from Orlando, US
201.105.242.127 AS8151 UNINET 4.70ms from Santiago de Queretaro, MX
121.158.101.95 AS4766 Korea Telecom 4.71ms from Seoul, KR
119.220.184.47 AS4766 Korea Telecom 4.24ms from Seoul, KR
195.234.161.15 AS60893 Art of Automation B.V. 0.59ms from Amsterdam, NL
139.208.36.47 AS4837 CHINA UNICOM China169 Backbone 12.17ms from Changchun, CN
222.209.174.255 AS4134 CHINANET-BACKBONE 2.99ms from Chengdu, CN
107.151.217.175 AS62610 Zenlayer Inc 0.33ms from Dallas, US
109.182.194.15 AS5603 Telekom Slovenije, d.d. 1.66ms from Ljubljana, SI
86.178.186.175 AS2856 British Telecommunications PLC 6.62ms from London, GB
38.60.107.15 AS8796 FASTNET DATA INC 0.28ms from Los Angeles, US
23.44.133.175 AS20940 Akamai International B.V. 0.91ms from New York City, US
210.169.11.15 AS2516 KDDI CORPORATION 1.86ms from Osaka, JP
38.63.198.111 AS54600 PEG TECH INC 0.18ms from San Jose, US
148.241.6.95 AS10436 Instituto Tecnológico y de Estudios Superiores de Monterrey 4.04ms from Santiago de Queretaro, MX
60.250.26.159 AS3462 Data Communication Business Group 0.84ms from Taipei, TW
124.214.94.223 AS2516 KDDI CORPORATION 9.76ms from Tokyo, JP
153.209.244.239 AS4713 NTT DOCOMO BUSINESS,Inc. 3.04ms from Tokyo, JP
74.235.229.207 AS8075 Microsoft Corporation 0.63ms from Ashburn, US

Traceroute

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

$
traceroute -a -n -q1 -f2 51.104.144.226
traceroute to 51.104.144.226 (51.104.144.226): 64 hops max, 52 byte packets
2 [AS3356] 212.113.8.137 10.84 ms
3 *
4 [AS8075] 104.44.37.11 20.403 ms
5 *
6 *
7 *
8 [AS8075] 51.10.17.124 27.269 ms
9 *
10 *
11 *
12 *
13 [AS8075] 51.104.144.226 27.471 ms
Measurement taken from IPinfo ProbeNet in Edinburgh, GB
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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