Registry intelligence
Retrieve the registry allocation record associated with an IPv6 address, including network ownership and registration data.
Cached registry record
This record is a cached response from an internet number registry. It can identify the address allocation or network, but it does not identify an individual device or user.
IPv6 address
2603:10a6:10:120::21
Record source
rdap
Cached at
2026-10-19 11:35:13 UTC
Cache status
Available for direct result URLs
What WHOIS can tell you
Important limits
A registry record describes an address allocation. It can be incomplete, may represent a provider rather than an end customer, and may change as networks are reassigned. Use it alongside routing and network evidence when investigating an address.
Raw registry response
{
"arin_originas0_originautnums": [],
"cidr0_cidrs": [
{
"v6prefix": "2603:1000::",
"length": 24
}
],
"endAddress": "2603:10ff:ffff:ffff:ffff:ffff:ffff:ffff",
"entities": [
{
"entities": [
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2025-10-16T14:01:14-04:00"
},
{
"eventAction": "registration",
"eventDate": "2013-08-20T19:26:59-04:00"
}
],
"handle": "MRPD-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/MRPD-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/ip/2603:10a6:10:120::21"
},
{
"href": "https://whois.arin.net/rest/poc/MRPD-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/ip/2603:10a6:10:120::21"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"remarks": [
{
"description": [
"To report suspected security issues specific to \r",
"traffic emanating from Microsoft online services, \r",
"including the distribution of malicious content \r",
"or other illicit or illegal material through a \r",
"Microsoft online service, please submit reports \r",
"to:\r",
"* https://cert.microsoft.com. \r",
"\r",
"For SPAM and other abuse issues, such as Microsoft \r",
"Accounts, please contact:\r",
"* abuse@microsoft.com. \r",
"\r",
"To report security vulnerabilities in Microsoft \r",
"products and services, please contact:\r",
"* secure@microsoft.com. \r",
"\r",
"For legal and law enforcement-related requests, \r",
"please contact:\r",
"* msndcc@microsoft.com\r",
"\r",
"For routing, peering or DNS issues, please \r",
"contact:\r",
"* IOC@microsoft.com"
],
"title": "Registration Comments"
}
],
"roles": [
"technical"
],
"status": [
"validated"
],
"vcardArray": [
"vcard",
[
[
"version",
[],
"text",
"4.0"
],
[
"adr",
{
"label": "One Microsoft Way\nRedmond\nWA\n98052\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"fn",
[],
"text",
"Microsoft Routing, Peering, and DNS"
],
[
"org",
[],
"text",
"Microsoft Corporation"
],
[
"kind",
[],
"text",
"group"
],
[
"email",
[],
"text",
"IOC@microsoft.com"
],
[
"tel",
{
"type": [
"work",
"voice"
]
},
"text",
"+1-425-882-8080"
]
]
]
},
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2023-07-11T19:59:19-04:00"
},
{
"eventAction": "registration",
"eventDate": "2023-06-13T16:28:52-04:00"
}
],
"handle": "SINGH683-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/SINGH683-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/ip/2603:10a6:10:120::21"
},
{
"href": "https://whois.arin.net/rest/poc/SINGH683-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/ip/2603:10a6:10:120::21"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"remarks": [
{
"description": [
"ARIN has attempted to validate the data for this POC, but has received no response from the POC since 2024-07-10"
],
"title": "Unvalidated POC"
}
],
"roles": [
"technical"
],
"vcardArray": [
"vcard",
[
[
"version",
[],
"text",
"4.0"
],
[
"adr",
{
"label": "1 Microsoft Way\nRedmond\nWA\n98052\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"fn",
[],
"text",
"Prachi Singh"
],
[
"n",
[],
"text",
[
"Singh",
"Prachi",
"",
"",
""
]
],
[
"kind",
[],
"text",
"individual"
],
[
"email",
[],
"text",
"pracsin@microsoft.com"
],
[
"tel",
{
"type": [
"work",
"voice"
]
},
"text",
"+1-425-707-5601"
]
]
]
},
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2025-10-21T16:47:32-04:00"
},
{
"eventAction": "registration",
"eventDate": "2021-10-13T17:30:13-04:00"
}
],
"handle": "IPHOS5-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/IPHOS5-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/ip/2603:10a6:10:120::21"
},
{
"href": "https://whois.arin.net/rest/poc/IPHOS5-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/ip/2603:10a6:10:120::21"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
"administrative",
"technical"
],
"status": [
"validated"
],
"vcardArray": [
"vcard",
[
[
"version",
[],
"text",
"4.0"
],
[
"adr",
{
"label": "One Microsoft Way\nRedmond\nWA\n20147\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"fn",
[],
"text",
"IPHostmaster IPHostmaster"
],
[
"n",
[],
"text",
[
"IPHostmaster",
"IPHostmaster",
"",
"",
""
]
],
[
"kind",
[],
"text",
"individual"
],
[
"email",
[],
"text",
"iphostmaster@microsoft.com"
],
[
"tel",
{
"type": [
"work",
"voice"
]
},
"text",
"+1-425-538-6637"
]
]
]
},
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2025-08-19T10:44:04-04:00"
},
{
"eventAction": "registration",
"eventDate": "2016-10-20T15:51:33-04:00"
}
],
"handle": "BEDAR6-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/BEDAR6-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/ip/2603:10a6:10:120::21"
},
{
"href": "https://whois.arin.net/rest/poc/BEDAR6-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/ip/2603:10a6:10:120::21"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
"technical"
],
"status": [
"validated"
],
"vcardArray": [
"vcard",
[
[
"version",
[],
"text",
"4.0"
],
[
"adr",
{
"label": "1 Redmond Way\nRedmond\nWA\n98052\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"fn",
[],
"text",
"Dawn Bedard"
],
[
"n",
[],
"text",
[
"Bedard",
"Dawn",
"",
"",
""
]
],
[
"kind",
[],
"text",
"individual"
],
[
"email",
[],
"text",
"dabedard@microsoft.com"
],
[
"tel",
{
"type": [
"work",
"voice"
]
},
"text",
"+1-425-538-6637"
]
]
]
},
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2025-06-10T13:18:57-04:00"
},
{
"eventAction": "registration",
"eventDate": "2013-08-20T19:24:57-04:00"
}
],
"handle": "MAC74-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/MAC74-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/ip/2603:10a6:10:120::21"
},
{
"href": "https://whois.arin.net/rest/poc/MAC74-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/ip/2603:10a6:10:120::21"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"remarks": [
{
"description": [
"To report suspected security issues specific to traffic emanating from Microsoft Online Services, including the distribution of malicious content or other illicit or illegal material through a Microsoft Online Service, please submit reports to https://cert.microsoft.com. \r",
"For SPAM and other abuse issues, such as Microsoft Accounts, please contact abuse@microsoft.com. \r",
"To report security vulnerabilities in Microsoft products and services, please contact secure@microsoft.com. \r",
"For legal and law enforcement-related requests, please contact msndcc@microsoft.com\r",
"For routing, peering or DNS issues, please contact IOC@microsoft.com"
],
"title": "Registration Comments"
}
],
"roles": [
"abuse"
],
"status": [
"validated"
],
"vcardArray": [
"vcard",
[
[
"version",
[],
"text",
"4.0"
],
[
"adr",
{
"label": "One Microsoft Way\nRedmond\nWA\n98052\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"fn",
[],
"text",
"Microsoft Abuse Contact"
],
[
"org",
[],
"text",
"Microsoft Corporation"
],
[
"kind",
[],
"text",
"group"
],
[
"email",
[],
"text",
"abuse@microsoft.com"
],
[
"tel",
{
"type": [
"work",
"voice"
]
},
"text",
"+1-425-882-8080"
]
]
]
},
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2026-04-10T19:08:09-04:00"
},
{
"eventAction": "registration",
"eventDate": "2023-06-13T16:26:16-04:00"
}
],
"handle": "CHATU3-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/CHATU3-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/ip/2603:10a6:10:120::21"
},
{
"href": "https://whois.arin.net/rest/poc/CHATU3-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/ip/2603:10a6:10:120::21"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
"routing"
],
"status": [
"validated"
],
"vcardArray": [
"vcard",
[
[
"version",
[],
"text",
"4.0"
],
[
"adr",
{
"label": "One Microsoft way\nRedmond\nWA\n98052\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"fn",
[],
"text",
"Somesh Chaturmohta"
],
[
"n",
[],
"text",
[
"Chaturmohta",
"Somesh",
"",
"",
""
]
],
[
"kind",
[],
"text",
"individual"
],
[
"email",
[],
"text",
"someshch@microsoft.com"
],
[
"tel",
{
"type": [
"work",
"voice"
]
},
"text",
"+1-425-882-8080"
]
]
]
}
],
"events": [
{
"eventAction": "last changed",
"eventDate": "2025-06-10T13:41:34-04:00"
},
{
"eventAction": "registration",
"eventDate": "1998-07-10T00:00:00-04:00"
}
],
"handle": "MSFT",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/MSFT",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/ip/2603:10a6:10:120::21"
},
{
"href": "https://whois.arin.net/rest/org/MSFT",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/ip/2603:10a6:10:120::21"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"remarks": [
{
"description": [
"To report suspected security issues specific to traffic emanating from Microsoft online services, including the distribution of malicious content or other illicit or illegal material through a Microsoft online service, please submit reports to:\r",
"* https://cert.microsoft.com. \r",
"\r",
"For SPAM and other abuse issues, such as Microsoft Accounts, please contact:\r",
"* abuse@microsoft.com. \r",
"\r",
"To report security vulnerabilities in Microsoft products and services, please contact:\r",
"* secure@microsoft.com. \r",
"\r",
"For legal and law enforcement-related requests, please contact:\r",
"* msndcc@microsoft.com\r",
"\r",
"For routing, peering or DNS issues, please \r",
"contact:\r",
"* IOC@microsoft.com"
],
"title": "Registration Comments"
}
],
"roles": [
"registrant"
],
"vcardArray": [
"vcard",
[
[
"version",
[],
"text",
"4.0"
],
[
"fn",
[],
"text",
"Microsoft Corporation"
],
[
"adr",
{
"label": "One Microsoft Way\nRedmond\nWA\n98052\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"kind",
[],
"text",
"org"
]
]
]
}
],
"events": [
{
"eventAction": "last changed",
"eventDate": "2014-06-05T15:12:30-04:00"
},
{
"eventAction": "registration",
"eventDate": "2014-06-05T15:12:30-04:00"
}
],
"handle": "NET6-2603-1000-1",
"ipVersion": "v6",
"links": [
{
"href": "https://rdap.arin.net/registry/ip/2603:1000::",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/ip/2603:10a6:10:120::21"
},
{
"href": "https://whois.arin.net/rest/net/NET6-2603-1000-1",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/ip/2603:10a6:10:120::21"
}
],
"name": "MSFT",
"notices": [
{
"description": [
"By using the ARIN RDAP/Whois service, you are agreeing to the RDAP/Whois Terms of Use"
],
"links": [
{
"href": "https://www.arin.net/resources/registry/whois/tou/",
"rel": "terms-of-service",
"type": "text/html",
"value": "https://rdap.arin.net/registry/ip/2603:10a6:10:120::21"
}
],
"title": "Terms of Service"
},
{
"description": [
"If you see inaccuracies in the results, please visit: "
],
"links": [
{
"href": "https://www.arin.net/resources/registry/whois/inaccuracy_reporting/",
"rel": "inaccuracy-report",
"type": "text/html",
"value": "https://rdap.arin.net/registry/ip/2603:10a6:10:120::21"
}
],
"title": "Whois Inaccuracy Reporting"
},
{
"description": [
"Copyright 1997-2026, American Registry for Internet Numbers, Ltd."
],
"title": "Copyright Notice"
}
],
"objectClassName": "ip network",
"parentHandle": "NET6-2600-1",
"port43": "whois.arin.net",
"rdapConformance": [
"nro_rdap_profile_0",
"rdap_level_0",
"cidr0",
"arin_originas0"
],
"remarks": [
{
"description": [
"To report suspected security issues specific to traffic emanating from Microsoft online services, including the distribution of malicious content or other illicit or illegal material through a Microsoft online service, please submit reports to: \r",
"* https://cert.microsoft.com. \r",
"\r",
"For SPAM and other abuse issues, such as Microsoft Accounts, please contact: \r",
"* abuse@microsoft.com. \r",
"\r",
"To report security vulnerabilities in Microsoft products and services, please contact: \r",
"* secure@microsoft.com. \r",
"\r",
"For legal and law enforcement-related requests, please contact: \r",
"* msndcc@microsoft.com \r",
"\r",
"For routing, peering or DNS issues, please \r",
"contact: \r",
"* IOC@microsoft.com"
],
"title": "Registration Comments"
}
],
"startAddress": "2603:1000::",
"status": [
"active"
],
"type": "DIRECT ALLOCATION"
}Available registry data
Open recent cached IPv6 registry records without creating another upstream WHOIS request.