Free network tools
AS WHOIS
Look up an Autonomous System — holder, registry, contacts, announced IPv4/IPv6 prefixes, upstreams and downstreams.
Network Report (All-in-one) BGP Looking Glass BGP Security Check RPKI Validator BGP Hijack & Leak Monitor ASN Intelligence Internet Outages & Anomalies Country Internet Report Domain Insights IP WHOIS AS WHOIS
AS23233
FENWICK - Fenwick & West, LLP. Announcing routesAS nameFENWICK
OrganisationFenwick & West, LLP.
Registry (RIR)ARIN
HandleAS23233
RangeAS23233
Registered13 Feb 2002
Last changed24 Feb 2012
Abuse contact[email protected]
3IPv4 prefixes
0IPv6 prefixes
3Upstreams
0Downstreams
Upstreams
| AS | Network name | Visibility |
|---|---|---|
| AS3356 | LEVEL3 - Level 3 Parent, LLC | 280 |
| AS7018 | ATT-INTERNET4 - AT&T Enterprises, LLC | 257 |
| AS19893 | NTT-GLOBAL-DATA-CENTERS-AMERICA-INC - NTT Global Data Centers Americas, INC. | 15 |
Downstreams
None seen.
IPv4 prefixes (3)
RPKI-validate all prefixes of AS23233
Contacts
| Role | Name | Handle | Email / phone | Address |
|---|---|---|---|---|
| registrant | Fenwick & West, LLP. | FWL-11 | 801 California Street, Mountain View, CA, 94041, United States | |
| administrative, technical, abuse | Kevin Moore | KM559-ARIN | [email protected], +1-650-428-4455 | 801 California Street, Mountain View, CA, 94041, United States |
| technical | Aaron Navratil | NAVRA3-ARIN | [email protected], +1-415-875-2050 | 801 California St, Mountain View, CA, 94101, United States |
| technical | Kevin Moore | KM559-ARIN | [email protected], +1-650-428-4455 | 801 California Street, Mountain View, CA, 94041, United States |
Raw registry response
{
"endAutnum": 23233,
"entities": [
{
"entities": [
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2025-10-31T15:25:07-04:00"
},
{
"eventAction": "registration",
"eventDate": "2000-08-17T11:22:53-04:00"
}
],
"handle": "KM559-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/KM559-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/23233"
},
{
"href": "https://whois.arin.net/rest/poc/KM559-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/23233"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
"administrative",
"technical",
"abuse"
],
"status": [
"validated"
],
"vcardArray": [
"vcard",
[
[
"version",
[],
"text",
"4.0"
],
[
"adr",
{
"label": "801 California Street\nMountain View\nCA\n94041\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"fn",
[],
"text",
"Kevin Moore"
],
[
"n",
[],
"text",
[
"Moore",
"Kevin",
"",
"",
""
]
],
[
"kind",
[],
"text",
"individual"
],
[
"email",
[],
"text",
"[email protected]"
],
[
"tel",
{
"type": [
"work",
"voice"
]
},
"text",
"+1-650-428-4455"
]
]
]
},
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2024-04-04T11:01:52-04:00"
},
{
"eventAction": "registration",
"eventDate": "2024-04-04T11:01:52-04:00"
}
],
"handle": "NAVRA3-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/NAVRA3-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/23233"
},
{
"href": "https://whois.arin.net/rest/poc/NAVRA3-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/23233"
}
],
"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 2025-04-04"
],
"title": "Unvalidated POC"
}
],
"roles": [
"technical"
],
"vcardArray": [
"vcard",
[
[
"version",
[],
"text",
"4.0"
],
[
"adr",
{
"label": "801 California St\nMountain View\nCA\n94101\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"fn",
[],
"text",
"Aaron Navratil"
],
[
"n",
[],
"text",
[
"Navratil",
"Aaron",
"",
"",
""
]
],
[
"kind",
[],
"text",
"individual"
],
[
"email",
[],
"text",
"[email protected]"
],
[
"tel",
{
"type": [
"work",
"voice"
]
},
"text",
"+1-415-875-2050"
]
]
]
}
],
"events": [
{
"eventAction": "last changed",
"eventDate": "2024-04-04T11:43:25-04:00"
},
{
"eventAction": "registration",
"eventDate": "2002-02-13T00:00:00-05:00"
}
],
"handle": "FWL-11",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/FWL-11",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/23233"
},
{
"href": "https://whois.arin.net/rest/org/FWL-11",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/23233"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
"registrant"
],
"vcardArray": [
"vcard",
[
[
"version",
[],
"text",
"4.0"
],
[
"fn",
[],
"text",
"Fenwick & West, LLP."
],
[
"adr",
{
"label": "801 California Street\nMountain View\nCA\n94041\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"kind",
[],
"text",
"org"
]
]
]
},
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2025-10-31T15:25:07-04:00"
},
{
"eventAction": "registration",
"eventDate": "2000-08-17T11:22:53-04:00"
}
],
"handle": "KM559-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/KM559-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/23233"
},
{
"href": "https://whois.arin.net/rest/poc/KM559-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/23233"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
"technical"
],
"status": [
"validated"
],
"vcardArray": [
"vcard",
[
[
"version",
[],
"text",
"4.0"
],
[
"adr",
{
"label": "801 California Street\nMountain View\nCA\n94041\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"fn",
[],
"text",
"Kevin Moore"
],
[
"n",
[],
"text",
[
"Moore",
"Kevin",
"",
"",
""
]
],
[
"kind",
[],
"text",
"individual"
],
[
"email",
[],
"text",
"[email protected]"
],
[
"tel",
{
"type": [
"work",
"voice"
]
},
"text",
"+1-650-428-4455"
]
]
]
}
],
"events": [
{
"eventAction": "last changed",
"eventDate": "2012-02-24T09:44:34-05:00"
},
{
"eventAction": "registration",
"eventDate": "2002-02-13T00:00:00-05:00"
}
],
"handle": "AS23233",
"links": [
{
"href": "https://rdap.arin.net/registry/autnum/23233",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/23233"
},
{
"href": "https://whois.arin.net/rest/asn/AS23233",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/23233"
}
],
"name": "FENWICK",
"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/autnum/23233"
}
],
"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/autnum/23233"
}
],
"title": "Whois Inaccuracy Reporting"
},
{
"description": [
"Copyright 1997-2026, American Registry for Internet Numbers, Ltd."
],
"title": "Copyright Notice"
}
],
"objectClassName": "autnum",
"port43": "whois.arin.net",
"rdapConformance": [
"nro_rdap_profile_0",
"rdap_level_0",
"nro_rdap_profile_asn_flat_0"
],
"startAutnum": 23233,
"status": [
"active"
]
}Results come from public internet registries and live global routing data. Results are cached for up to an hour. Lookups are logged with your IP address to prevent abuse — see our Privacy Policy.