51.103.0.0/16

AS8075 · Microsoft Corporation

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Summary

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

WHOIS Details

inetnum:        51.103.0.0 - 51.103.255.255
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:    [email protected]
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:         [email protected]
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:          51.103.0.0/16
origin:         AS8075
descr:          Microsoft
notify:         [email protected]
mnt-by:         MICROSOFT-MAINT
created:        2020-07-20T21:01:42Z
last-modified:  2020-07-20T21:01:42Z
source:         RIPE

Nearby Ranges

BGP prefixes that overlap with 51.0.0.0/8

Range	ASN	Company	Num of IPs
51.6.0.0/15	AS6871		131,072
51.172.0.0/15	AS16509	A100 ROW Inc	131,072
51.94.0.0/15	AS16509	A100 ROW Inc	131,072
51.158.0.0/15	AS12876	Scaleway	131,072
51.220.0.0/15	AS16509	A100 ROW Inc	131,072
51.244.0.0/15	AS16509	A100 ROW Inc	131,072
51.236.0.0/15	AS16509	A100 ROW Inc	131,072
51.48.0.0/15	AS16509	A100 ROW Inc	131,072
51.190.0.0/15	AS5607	SKY UK Limited	131,072
51.212.0.0/15	AS16509	A100 ROW Inc	131,072
51.184.0.0/15	AS16509	A100 ROW Inc	131,072
51.174.0.0/15	AS29695	Altibox AS	131,072
51.208.0.0/15	AS16509	A100 ROW Inc	131,072
51.168.0.0/15	AS16509	A100 ROW Inc	131,072
51.224.0.0/15	AS16509	Amazon Data Services European Sovereign Cloud GmbH	131,072
51.232.0.0/15	AS16509	A100 ROW Inc	131,072
51.248.0.0/15	AS16509	A100 ROW Inc	131,072
51.34.0.0/15	AS16509	A100 Row Inc	131,072
51.252.0.0/15	AS25019	Saudi Telecom Company JSC	131,072
51.186.0.0/15	AS5607	SKY UK Limited	131,072
51.216.0.0/15	AS16509	A100 ROW Inc	131,072
51.4.0.0/15	AS8075	Microsoft Deutschland MCIO GmbH	131,072
51.180.0.0/15	AS16509	A100 ROW Inc	131,072
51.214.0.0/15	AS16509	A100 Row Inc	131,072
51.196.0.0/15	AS16509	A100 ROW Inc	131,072
51.182.0.0/15	AS5607	SKY UK Limited	131,072
51.156.0.0/15	AS16509	A100 Row Inc	131,072
51.122.0.0/15	AS16509	A100 Row Inc	131,072
51.188.0.0/15	AS16509	A100 ROW Inc	131,072
51.254.0.0/15	AS16276	OVH SAS	131,072
51.176.0.0/15	AS16509	A100 ROW Inc	131,072
51.192.0.0/15	AS16509	A100 ROW Inc	131,072
51.16.0.0/15	AS16509	A100 Row Inc	131,072
51.228.0.0/15	AS16509	A100 ROW Inc	131,072
51.139.0.0/16	AS16509	A100 ROW Inc	65,536
51.150.0.0/16	AS16509	A100 Row Inc	65,536
51.20.0.0/16	AS16509	A100 ROW Inc	65,536
51.148.0.0/16	AS13037	Zen Internet Limited	65,536
51.125.0.0/16	AS16509	A100 ROW Inc	65,536
51.131.0.0/16	AS16509	A100 ROW Inc	65,536
51.134.0.0/16	AS16509	A100 ROW Inc	65,536
51.110.0.0/16	AS16509	A100 Row Inc	65,536
51.108.0.0/16	AS16509	A100 Row Inc	65,536
51.160.0.0/16	AS16509	A100 ROW Inc	65,536
51.21.0.0/16	AS16509	A100 ROW Inc	65,536
51.91.0.0/16	AS16276	OVH SAS	65,536
51.89.0.0/16	AS16276	OVH SAS	65,536
51.83.0.0/16	AS16276	OVH SAS	65,536
51.112.0.0/16	AS16509	A100 ROW Inc	65,536
51.77.0.0/16	AS16276	OVH SAS	65,536

Hosted domains

There are 11,916 domain names hosted across 523 IP addresses on this ASN. Checkout our API to access full domain hosting information.

IP Address	Domain	Domains on this IP
51.103.45.117	souvenirs-captures.com	9353
51.103.129.179	fer-valais-avs.ch	146
51.103.19.211	maformation.fr	116
51.103.19.220	myelefant-data.com	110
51.103.132.64	media-jobs.ch	96
51.103.165.248	vbzl.ch	95
51.103.54.68	comptalia.com	90
51.103.100.99	gcdljpz.sbs	85
51.103.133.75	haltenspatower.ch	74
51.103.225.47	fromagesdesuisse.com	61
51.103.89.23	cocculine.fr	48
51.103.209.124	zwischen-bier.ch	43
51.103.39.58	mini-mir.fr	40
51.103.247.113	dontmessitup.ch	37
51.103.116.172	fls-rs.com	35
51.103.165.2	trosafoto.se	34
51.103.24.238	vetrocontainer.ro	34
51.103.132.157	helsana.ch	34
51.103.21.152	bleu-cloud.website	33
51.103.88.187	ddosymemekgerek.net	30

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

7,947 IPs in this range replied to an ICMP ping during our most recent internet scan. Learn more.

IP Address	ASN	Details
51.103.138.147	AS8075 Microsoft Corporation	`0.20ms` from Kloten, CH
51.103.153.135	AS8075 Microsoft Corporation	`0.18ms` from Kloten, CH
51.103.102.92	AS8075 Microsoft Corporation	`0.38ms` from Paris, FR
51.103.124.4	AS8075 Microsoft Corporation	`0.37ms` from Paris, FR
51.103.110.76	AS8075 Microsoft Corporation	`0.34ms` from Paris, FR
51.103.36.66	AS8075 Microsoft Corporation	`0.39ms` from Paris, FR
51.103.129.51	AS8075 Microsoft Corporation	`0.20ms` from Kloten, CH
51.103.96.243	AS8075 Microsoft Corporation	`0.34ms` from Paris, FR
51.103.59.72	AS8075 Microsoft Corporation	`0.33ms` from Paris, FR
51.103.0.248	AS8075 Microsoft Corporation	`0.36ms` from Paris, FR
51.103.104.237	AS8075 Microsoft Corporation	`0.37ms` from Paris, FR
51.103.157.185	AS8075 Microsoft Corporation	`0.17ms` from Kloten, CH
51.103.42.235	AS8075 Microsoft Corporation	`0.38ms` from Paris, FR
51.103.87.243	AS8075 Microsoft Corporation	`0.47ms` from Paris, FR
51.103.49.143	AS8075 Microsoft Corporation	`0.39ms` from Paris, FR
51.103.73.165	AS8075 Microsoft Corporation	`0.37ms` from Paris, FR
51.103.148.62	AS8075 Microsoft Corporation	`0.18ms` from Kloten, CH
51.103.140.19	AS8075 Microsoft Corporation	`0.19ms` from Kloten, CH
51.103.121.121	AS8075 Microsoft Corporation	`0.40ms` from Paris, FR
51.103.117.89	AS8075 Microsoft Corporation	`0.38ms` from Paris, FR
51.103.119.71	AS8075 Microsoft Corporation	`0.44ms` from Paris, FR
51.103.18.215	AS8075 Microsoft Corporation	`0.38ms` from Paris, FR
51.103.71.84	AS8075 Microsoft Corporation	`0.44ms` from Paris, FR
51.103.33.193	AS8075 Microsoft Corporation	`0.37ms` from Paris, FR
51.103.45.130	AS8075 Microsoft Corporation	`0.41ms` from Paris, FR

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
192.99.18.96	AS16276 OVH SAS	`0.08ms` from Beauharnois, CA
222.28.83.32	AS4538 China Education and Research Network Center	`3.15ms` from Beijing, CN
122.151.202.240	AS9443 Vocus Retail	`1.10ms` from Brisbane, AU
207.144.145.224	AS2711 Spirit Communications	`0.70ms` from Charlotte, US
87.140.21.32	AS3320 Deutsche Telekom AG	`6.18ms` from Hamburg, DE
117.5.219.224	AS7552 Viettel Group	`1.33ms` from Hanoi, VN
76.167.98.224	AS20001 Charter Communications Inc	`4.63ms` from Los Angeles, US
76.87.110.32	AS20001 Charter Communications Inc	`6.96ms` from Los Angeles, US
117.99.62.32	AS45609 Bharti Airtel Ltd. AS for GPRS Service	`11.57ms` from Mumbai, IN
45.171.144.0	AS268715 N3 SOLUCOES TECNOLOGICAS LTDA	`12.19ms` from Osasco, BR
100.8.48.64	AS701 Verizon Business	`1.75ms` from Secaucus, US
124.53.234.144	AS17858 LG POWERCOMM	`5.01ms` from Seoul, KR
115.20.186.64	AS4766 Korea Telecom	`3.21ms` from Seoul, KR
1.249.127.48	AS9318 SK Broadband Co Ltd	`6.03ms` from Seoul, KR
118.158.242.112	AS2516 KDDI CORPORATION	`6.63ms` from Tokyo, JP
71.61.110.48	AS7922 Comcast Cable Communications, LLC	`12.83ms` from Ashburn, US
3.31.19.112	AS8987 Amazon Data Services Ireland Ltd	`0.35ms` from Boardman, US
184.16.202.208	AS5650 Frontier Communications of America, Inc.	`8.88ms` from Chicago, US
90.200.162.128	AS5607 Sky UK Limited	`5.01ms` from Erith, GB
72.41.6.176	AS16509 Amazon.com, Inc.	`0.09ms` from Houston, US
73.88.16.208	AS7922 Comcast Cable Communications, LLC	`8.85ms` from Minneapolis, US
189.63.178.80	AS28573 Claro NXT Telecomunicacoes Ltda	`9.25ms` from Novo Hamburgo, BR
182.70.107.16	AS24560 Bharti Airtel Ltd., Telemedia Services	`2.11ms` from Pune, IN
54.205.209.192	AS14618 Amazon.com, Inc.	`0.22ms` from Reston, US
20.245.225.0	AS8075 Microsoft Corporation	`0.54ms` from San Jose, US

Traceroute

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

traceroute -a -n -q1 -m5 51.103.187.34

traceroute to 51.103.187.34 (51.103.187.34): 5 hops max, 52 byte packets

1 [AS15169] 74.125.253.192 0.709 ms

2 [AS8075] 104.44.46.203 0.876 ms

3 *

4 *

5 *

Measurement taken from

IPinfo ProbeNet in Santiago, CL

On December 6th 2025

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