AS19858
M. Arthur Gensler Jr. & Associates, Inc.
ARIN US active Announced
More ASNs in the United States → Organization
M. Arthur Gensler Jr. & Associates, Inc.
GENSLER
Registered
Feb 21, 2001
25 years ago
IPv4 Prefixes
2
512 addresses
IPv6 Prefixes
0
BGP Neighbours
3
3 upstream/peer · 0 downstream
Registration
AS Number AS19858 AS Name GENSLER Organization M. Arthur Gensler Jr. & Associates, Inc. Organization ID GAA Address 2101 Webster St., Suite 2000, Oakland, CA, 94612, United States Country United States (US) Registry ARIN Allocated Feb 21, 2001 Record Created Feb 21, 2001 Last Updated Jun 30, 2025 Status
active
WHOIS Server whois.arin.net AS Description GENSLER - M. Arthur Gensler Jr. & Associates, Inc., US Abuse Email [email protected] Abuse Phone +1-832-496-8696 IPv4 Prefixes
2 prefixes · 512 addresses Routing data as of 2026-10-09 08:00 UTC
| Prefix | Range | Addresses |
|---|---|---|
| 64.239.72.0/24 | 64.239.72.0 – 64.239.72.255 | 256 |
| 64.239.73.0/24 | 64.239.73.0 – 64.239.73.255 | 256 |
IPv6 Prefixes
This AS does not currently announce any IPv6 prefixes.
BGP Neighbours
3 unique neighbours · 3 upstream/peer · 0 downstream. A neighbour can be seen on more than one side. Rows are ordered by AS paths: the number of BGP paths seen by RIPE RIS that contain the adjacency. Sightings count each IPv4/IPv6 route with the adjacency once per RIS peer that sees it (routes × peers), so they show how widely it is seen, not how many distinct routes it carries. Networks seen to the left of this AS in BGP paths, toward the route collectors — typically its transit providers (upstreams) and peers. Upstream & peer side (3)
Raw RDAP Response
{
"endAutnum": 19858,
"entities": [
{
"entities": [
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2026-04-17T10:23:36-04:00"
},
{
"eventAction": "registration",
"eventDate": "2025-04-17T13:35:20-04:00"
}
],
"handle": "BALTE2-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/BALTE2-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/19858"
},
{
"href": "https://whois.arin.net/rest/poc/BALTE2-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/19858"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
"noc",
"technical",
"administrative",
"abuse",
"routing"
],
"status": [
"validated"
],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"adr",
{
"label": "1011 South Congress Avenue\nBldg. 1, Suite 200\nAustin\nTX\n78704\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"fn",
{},
"text",
"Matthew Baltera"
],
[
"n",
{},
"text",
[
"Baltera",
"Matthew",
"",
"",
""
]
],
[
"kind",
{},
"text",
"individual"
],
[
"email",
{},
"text",
"[email protected]"
],
[
"tel",
{
"type": [
"work",
"voice"
]
},
"text",
"+1-832-496-8696"
]
]
]
},
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2026-06-01T09:44:07-04:00"
},
{
"eventAction": "registration",
"eventDate": "2025-06-30T18:16:08-04:00"
}
],
"handle": "NDE44-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/NDE44-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/19858"
},
{
"href": "https://whois.arin.net/rest/poc/NDE44-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/19858"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
"abuse",
"routing",
"technical",
"noc"
],
"status": [
"validated"
],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"adr",
{
"label": "2101 Webster St.\nSuite 2000\nOakland\nCA\n94612\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"fn",
{},
"text",
"Nathan Daniel Eigsti"
],
[
"n",
{},
"text",
[
"Eigsti",
"Nathan",
"Daniel",
"",
""
]
],
[
"kind",
{},
"text",
"individual"
],
[
"email",
{},
"text",
"[email protected]"
],
[
"tel",
{
"type": [
"work",
"voice"
]
},
"text",
"+1-510-625-7449"
]
]
]
},
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2022-04-12T20:24:12-04:00"
},
{
"eventAction": "registration",
"eventDate": "2014-11-06T12:03:03-05:00"
}
],
"handle": "HEROL-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/HEROL-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/19858"
},
{
"href": "https://whois.arin.net/rest/poc/HEROL-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/19858"
}
],
"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 2023-04-12"
],
"title": "Unvalidated POC"
}
],
"roles": [
"technical"
],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"fn",
{},
"text",
"REDACTED"
],
[
"kind",
{},
"text",
"individual"
]
]
]
},
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2026-09-09T09:25:35-04:00"
},
{
"eventAction": "registration",
"eventDate": "2023-09-08T17:51:58-04:00"
}
],
"handle": "LAB21-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/LAB21-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/19858"
},
{
"href": "https://whois.arin.net/rest/poc/LAB21-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/19858"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
"technical"
],
"status": [
"validated"
],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"fn",
{},
"text",
"REDACTED"
],
[
"kind",
{},
"text",
"individual"
]
]
]
},
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2016-09-22T11:31:05-04:00"
},
{
"eventAction": "registration",
"eventDate": "2015-03-16T16:16:43-04:00"
}
],
"handle": "RANEY3-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/RANEY3-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/19858"
},
{
"href": "https://whois.arin.net/rest/poc/RANEY3-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/19858"
}
],
"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 2022-04-13"
],
"title": "Unvalidated POC"
}
],
"roles": [
"technical"
],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"fn",
{},
"text",
"REDACTED"
],
[
"kind",
{},
"text",
"individual"
]
]
]
}
],
"events": [
{
"eventAction": "last changed",
"eventDate": "2025-06-30T18:17:31-04:00"
},
{
"eventAction": "registration",
"eventDate": "1990-05-29T00:00:00-04:00"
}
],
"handle": "GAA",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/GAA",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/19858"
},
{
"href": "https://whois.arin.net/rest/org/GAA",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/19858"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
"registrant"
],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"fn",
{},
"text",
"M. Arthur Gensler Jr. & Associates, Inc."
],
[
"adr",
{
"label": "2101 Webster St.\r\nSuite 2000\nOakland\nCA\n94612\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"kind",
{},
"text",
"org"
]
]
]
},
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2026-04-17T10:23:36-04:00"
},
{
"eventAction": "registration",
"eventDate": "2025-04-17T13:35:20-04:00"
}
],
"handle": "BALTE2-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/BALTE2-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/19858"
},
{
"href": "https://whois.arin.net/rest/poc/BALTE2-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/19858"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
"abuse",
"technical"
],
"status": [
"validated"
],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"adr",
{
"label": "1011 South Congress Avenue\nBldg. 1, Suite 200\nAustin\nTX\n78704\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"fn",
{},
"text",
"Matthew Baltera"
],
[
"n",
{},
"text",
[
"Baltera",
"Matthew",
"",
"",
""
]
],
[
"kind",
{},
"text",
"individual"
],
[
"email",
{},
"text",
"[email protected]"
],
[
"tel",
{
"type": [
"work",
"voice"
]
},
"text",
"+1-832-496-8696"
]
]
]
}
],
"events": [
{
"eventAction": "last changed",
"eventDate": "2025-06-30T18:04:02-04:00"
},
{
"eventAction": "registration",
"eventDate": "2001-02-21T00:00:00-05:00"
}
],
"handle": "AS19858",
"links": [
{
"href": "https://rdap.arin.net/registry/autnum/19858",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/19858"
},
{
"href": "https://whois.arin.net/rest/asn/AS19858",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/19858"
}
],
"name": "GENSLER",
"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/19858"
}
],
"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/19858"
}
],
"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": 19858,
"status": [
"active"
]
} Contact details of private individuals are redacted.