Organization
United States Department of the Treasury
US-DEPARTMENT-OF-THE-TREASURY
Location
San Jose
California, United States (US)
Hostname
—
Geolocation
United States (US) United States
- Country
- United States (US)
- Region
- California
- City
- San Jose
- Continent
- North America
- Coordinates
- 37.3387, -121.885 View on map ↗
Network Information
IP Range 166.123.0.0 – 166.123.255.255 CIDR 166.123.0.0/16 Network Name US-DEPARTMENT-OF-THE-TREASURY Handle NET-166-123-0-0-1 Type DIRECT ALLOCATION Parent Network NET-166-0-0-0-0 Organization United States Department of the Treasury Organization ID UDT-6-Z Address OCIO, 1750 Pennsylvania Ave., NW, Washington, DC, 20006, United States Country United States (US) Registry ARIN Registered On Dec 29, 1993 Last Updated May 31, 2024 Status
active
ASN & Routing
Origin AS AS13506 AS Name US-DEPARTMENT-OF-THE-TREASURY - United States Department of the Treasury, US Announced Prefix 166.123.208.0/24 AS Registry ARIN Prefix Country United States (US) Allocated 1993-12-29 RPKI Origin Valid (covered by a matching ROA)
Reverse DNS
No PTR record is published for this address.
Abuse Contact
Raw RDAP Response
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"arin_originas0_originautnums": [],
"cidr0_cidrs": [
{
"v4prefix": "166.123.0.0",
"length": 16
}
],
"endAddress": "166.123.255.255",
"entities": [
{
"entities": [
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2025-03-26T14:01:47-04:00"
},
{
"eventAction": "registration",
"eventDate": "2025-03-26T14:01:47-04:00"
}
],
"handle": "USTRE-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/USTRE-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/ip/166.123.208.0"
},
{
"href": "https://whois.arin.net/rest/poc/USTRE-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/ip/166.123.208.0"
}
],
"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 2026-03-26"
],
"title": "Unvalidated POC"
}
],
"roles": [
"abuse",
"noc"
],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"adr",
{
"label": "1500 Pennsylvania Avenue\nWashington\nDC\n20220\nUnited States"
},
"text",
[
"",
"",
"",
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"",
"",
""
]
],
[
"fn",
{},
"text",
"US-TREASURY-SOC"
],
[
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{},
"text",
"Department of the Treasury"
],
[
"kind",
{},
"text",
"group"
],
[
"email",
{},
"text",
"[email protected]"
],
[
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{
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]
},
"text",
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]
]
]
},
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2026-08-25T14:19:49-04:00"
},
{
"eventAction": "registration",
"eventDate": "2012-09-05T10:38:24-04:00"
}
],
"handle": "DLS46-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/DLS46-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/ip/166.123.208.0"
},
{
"href": "https://whois.arin.net/rest/poc/DLS46-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/ip/166.123.208.0"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
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],
"status": [
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],
"vcardArray": [
"vcard",
[
[
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{},
"text",
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],
[
"fn",
{},
"text",
"REDACTED"
],
[
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{},
"text",
"individual"
]
]
]
},
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2026-03-27T08:56:17-04:00"
},
{
"eventAction": "registration",
"eventDate": "2025-03-27T08:50:35-04:00"
}
],
"handle": "METZI13-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/METZI13-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/ip/166.123.208.0"
},
{
"href": "https://whois.arin.net/rest/poc/METZI13-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/ip/166.123.208.0"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
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"technical"
],
"status": [
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],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"fn",
{},
"text",
"REDACTED"
],
[
"kind",
{},
"text",
"individual"
]
]
]
},
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2026-03-12T10:24:43-04:00"
},
{
"eventAction": "registration",
"eventDate": "2024-03-07T13:48:26-05:00"
}
],
"handle": "TIC5-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/TIC5-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/ip/166.123.208.0"
},
{
"href": "https://whois.arin.net/rest/poc/TIC5-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/ip/166.123.208.0"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
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"technical"
],
"status": [
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],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
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],
[
"adr",
{
"label": "200 3rd Street\nParkersburg\nWV\n26101\nUnited States"
},
"text",
[
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""
]
],
[
"fn",
{},
"text",
"TIC"
],
[
"org",
{},
"text",
"Bureau of the Fiscal Service"
],
[
"kind",
{},
"text",
"group"
],
[
"email",
{},
"text",
"[email protected]"
],
[
"tel",
{
"type": [
"work",
"voice"
]
},
"text",
"+1-304-480-6845"
]
]
]
}
],
"events": [
{
"eventAction": "last changed",
"eventDate": "2026-07-15T15:20:44-04:00"
},
{
"eventAction": "registration",
"eventDate": "2024-05-01T11:22:30-04:00"
}
],
"handle": "UDT-6-Z",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/UDT-6-Z",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/ip/166.123.208.0"
},
{
"href": "https://whois.arin.net/rest/org/UDT-6-Z",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/ip/166.123.208.0"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
"registrant"
],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"fn",
{},
"text",
"United States Department of the Treasury"
],
[
"adr",
{
"label": "OCIO\n1750 Pennsylvania Ave., NW\nWashington\nDC\n20006\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"kind",
{},
"text",
"org"
]
]
]
}
],
"events": [
{
"eventAction": "last changed",
"eventDate": "2024-05-31T11:19:18-04:00"
},
{
"eventAction": "registration",
"eventDate": "1993-12-29T00:00:00-05:00"
}
],
"handle": "NET-166-123-0-0-1",
"ipVersion": "v4",
"links": [
{
"href": "https://rdap.arin.net/registry/ip/166.123.0.0",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/ip/166.123.208.0"
},
{
"href": "https://whois.arin.net/rest/net/NET-166-123-0-0-1",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/ip/166.123.208.0"
}
],
"name": "US-DEPARTMENT-OF-THE-TREASURY",
"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/166.123.208.0"
}
],
"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/166.123.208.0"
}
],
"title": "Whois Inaccuracy Reporting"
},
{
"description": [
"Copyright 1997-2026, American Registry for Internet Numbers, Ltd."
],
"title": "Copyright Notice"
}
],
"objectClassName": "ip network",
"parentHandle": "NET-166-0-0-0-0",
"port43": "whois.arin.net",
"rdapConformance": [
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"rdap_level_0",
"cidr0",
"arin_originas0"
],
"startAddress": "166.123.0.0",
"status": [
"active"
],
"type": "DIRECT ALLOCATION"
} Contact details of private individuals are redacted.