Whois & RDAP Lookup
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RDAPIP Range4.0.0.0 - 4.255.255.255
HandleNET-4-0-0-0-0
NameNET4
HolderAmerican Registry for Internet Numbers
Registered1992-12-01 05:00 UTC
Updated2019-07-02 19:53 UTC
RegistrantAmerican Registry for Internet Numbers
AddressPO Box 232290, Centreville, VA, 20120, United States
Admin ContactRegistration Services Department
OrganizationAmerican Registry for Internet Numbers
Email[email protected]
Phone+1-703-227-0660
AddressP.O. Box 232290, Centreville, VA, 20120, United States
Tech ContactRegistration Services Department
OrganizationAmerican Registry for Internet Numbers
Email[email protected]
Phone+1-703-227-0660
AddressP.O. Box 232290, Centreville, VA, 20120, United States
Abuse Contact[email protected]
Abuse Phone+1-703-227-0660
Statusadministrative
Registry RDAPhttps://rdap.arin.net
Raw WHOIS response
# # ARIN WHOIS data and services are subject to the Terms of Use # available at: https://www.arin.net/resources/registry/whois/tou/ # # If you see inaccuracies in the results, please report at # https://www.arin.net/resources/registry/whois/inaccuracy_reporting/ # # Copyright 1997-2026, American Registry for Internet Numbers, Ltd. # NetRange: 4.160.0.0 - 4.175.255.255 CIDR: 4.160.0.0/12 NetName: MSFT NetHandle: NET-4-160-0-0-2 Parent: NET4 (NET-4-0-0-0-0) NetType: Direct Allocation OriginAS: Organization: Microsoft Corporation (MSFT) RegDate: 2020-01-06 Updated: 2020-01-06 Ref: https://rdap.arin.net/registry/ip/4.160.0.0 OrgName: Microsoft Corporation OrgId: MSFT Address: One Microsoft Way City: Redmond StateProv: WA PostalCode: 98052 Country: US RegDate: 1998-07-10 Updated: 2025-06-10 Comment: 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: Comment: * https://cert.microsoft.com. Comment: Comment: For SPAM and other abuse issues, such as Microsoft Accounts, please contact: Comment: * [email protected]. Comment: Comment: To report security vulnerabilities in Microsoft products and services, please contact: Comment: * [email protected]. Comment: Comment: For legal and law enforcement-related requests, please contact: Comment: * [email protected] Comment: Comment: For routing, peering or DNS issues, please Comment: contact: Comment: * [email protected] Ref: https://rdap.arin.net/registry/entity/MSFT OrgRoutingHandle: CHATU3-ARIN OrgRoutingName: Chaturmohta, Somesh OrgRoutingPhone: +1-425-882-8080 OrgRoutingEmail: [email protected] OrgRoutingRef: https://rdap.arin.net/registry/entity/CHATU3-ARIN OrgAbuseHandle: MAC74-ARIN OrgAbuseName: Microsoft Abuse Contact OrgAbusePhone: +1-425-882-8080 OrgAbuseEmail: [email protected] OrgAbuseRef: https://rdap.arin.net/registry/entity/MAC74-ARIN OrgTechHandle: BEDAR6-ARIN OrgTechName: Bedard, Dawn OrgTechPhone: +1-425-538-6637 OrgTechEmail: [email protected] OrgTechRef: https://rdap.arin.net/registry/entity/BEDAR6-ARIN OrgTechHandle: IPHOS5-ARIN OrgTechName: IPHostmaster, IPHostmaster OrgTechPhone: +1-425-538-6637 OrgTechEmail: [email protected] OrgTechRef: https://rdap.arin.net/registry/entity/IPHOS5-ARIN OrgTechHandle: MRPD-ARIN OrgTechName: Microsoft Routing, Peering, and DNS OrgTechPhone: +1-425-882-8080 OrgTechEmail: [email protected] OrgTechRef: https://rdap.arin.net/registry/entity/MRPD-ARIN OrgTechHandle: SINGH683-ARIN OrgTechName: Singh, Prachi OrgTechPhone: +1-425-707-5601 OrgTechEmail: [email protected] OrgTechRef: https://rdap.arin.net/registry/entity/SINGH683-ARIN # # ARIN WHOIS data and services are subject to the Terms of Use # available at: https://www.arin.net/resources/registry/whois/tou/ # # If you see inaccuracies in the results, please report at # https://www.arin.net/resources/registry/whois/inaccuracy_reporting/ # # Copyright 1997-2026, American Registry for Internet Numbers, Ltd. # % Query time: 641 msec % WHEN: Fri Jul 31 08:26:01 UTC 2026
Raw RDAP JSON (registry) https://rdap.arin.net
{
"arin_originas0_originautnums": [],
"cidr0_cidrs": [
{
"length": 8,
"v4prefix": "4.0.0.0"
}
],
"endAddress": "4.255.255.255",
"entities": [
{
"entities": [
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2026-04-01T09:19:51-04:00"
},
{
"eventAction": "registration",
"eventDate": "2003-04-30T12:32:56-04:00"
}
],
"handle": "ARIN-HOSTMASTER",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/ARIN-HOSTMASTER",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/ip/4.160.0.0/11"
},
{
"href": "https://whois.arin.net/rest/poc/ARIN-HOSTMASTER",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/ip/4.160.0.0/11"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
"technical",
"administrative",
"abuse"
],
"status": [
"validated"
],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"adr",
{
"label": "P.O. Box 232290\nCentreville\nVA\n20120\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"fn",
{},
"text",
"Registration Services Department"
],
[
"org",
{},
"text",
"American Registry for Internet Numbers"
],
[
"kind",
{},
"text",
"group"
],
[
"email",
{},
"text",
"[email protected]"
],
[
"tel",
{
"type": [
"work",
"voice"
]
},
"text",
"+1-703-227-0660"
]
]
]
},
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2026-04-01T09:18:02-04:00"
},
{
"eventAction": "registration",
"eventDate": "2002-11-05T12:03:56-05:00"
}
],
"handle": "ARINN-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/ARINN-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/ip/4.160.0.0/11"
},
{
"href": "https://whois.arin.net/rest/poc/ARINN-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/ip/4.160.0.0/11"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
"noc"
],
"status": [
"validated"
],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"adr",
{
"label": "P.O. Box 232290\nCentreville\nVA\n20120\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"fn",
{},
"text",
"ARIN NOC"
],
[
"org",
{},
"text",
"American Registry for Internet Numbers"
],
[
"kind",
{},
"text",
"group"
],
[
"email",
{},
"text",
"[email protected]"
],
[
"tel",
{
"type": [
"work",
"voice"
]
},
"text",
"+1-703-227-9840"
]
]
]
}
],
"events": [
{
"eventAction": "last changed",
"eventDate": "2019-03-02T14:54:51-05:00"
},
{
"eventAction": "registration",
"eventDate": "1997-12-22T00:00:00-05:00"
}
],
"handle": "ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/ip/4.160.0.0/11"
},
{
"href": "https://whois.arin.net/rest/org/ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/ip/4.160.0.0/11"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"remarks": [
{
"description": [
"For abuse issues please see URL:\r",
"https://www.arin.net/reference/materials/abuse/ \r",
"The Registration Services Help Desk is open \r",
"from 7 a.m. to 7 p.m., U.S. Eastern time to assist you.\r",
"Phone Number: (703) 227-0660; Fax Number: (703) 997-8844."
],
"title": "Registration Comments"
}
],
"roles": [
"registrant"
],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"fn",
{},
"text",
"American Registry for Internet Numbers"
],
[
"adr",
{
"label": "PO Box 232290\nCentreville\nVA\n20120\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"kind",
{},
"text",
"org"
]
]
]
}
],
"events": [
{
"eventAction": "last changed",
"eventDate": "2019-07-02T15:53:14-04:00"
},
{
"eventAction": "registration",
"eventDate": "1992-12-01T00:00:00-05:00"
}
],
"handle": "NET-4-0-0-0-0",
"ipVersion": "v4",
"links": [
{
"href": "https://rdap.arin.net/registry/ip/4.0.0.0",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/ip/4.160.0.0/11"
},
{
"href": "https://whois.arin.net/rest/net/NET-4-0-0-0-0",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/ip/4.160.0.0/11"
}
],
"name": "NET4",
"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/4.160.0.0/11"
}
],
"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/4.160.0.0/11"
}
],
"title": "Whois Inaccuracy Reporting"
},
{
"description": [
"Copyright 1997-2026, American Registry for Internet Numbers, Ltd."
],
"title": "Copyright Notice"
}
],
"objectClassName": "ip network",
"port43": "whois.arin.net",
"rdapConformance": [
"nro_rdap_profile_0",
"rdap_level_0",
"cidr0",
"arin_originas0"
],
"startAddress": "4.0.0.0",
"status": [
"administrative"
]
}Frequently asked questions
What is WHOIS?
WHOIS is a public directory that answers "who is responsible for this?" for domains, IP ranges and ASNs. It lists registration dates, the registrar, nameservers and contacts.
What is RDAP, and how does it differ?
RDAP is the modern replacement for WHOIS. It returns the same records in a structured, consistent format. We query RDAP first and fall back to classic WHOIS text when a registry has not adopted it yet.
What is the difference between a registrar and a registrant?
The registrar is the company you register and manage a domain through, such as xTom or GoDaddy. The registrant is the person or organization that actually holds the domain.
What are nameservers?
Nameservers answer DNS questions for a domain and decide which IP addresses the name resolves to. They also show which DNS provider the domain uses.
What is DNSSEC?
DNSSEC adds cryptographic signatures to DNS answers so they cannot be quietly altered in transit. "Signed" means the domain has it enabled, "unsigned" means it does not.
Why is the contact information redacted?
Privacy laws such as GDPR require registrars to hide most personal details in public records. The abuse contact is usually still shown, so a domain or network can be reported when something goes wrong.