AS20252
Joan and Sanford I. Weill Medical College and Graduate School of Medical Sciences of Cornell University
ARIN US active Announced
More ASNs in the United States → Organization
Joan and Sanford I. Weill Medical College and Graduate School of Medical Sciences of Cornell University
JSIWMC
Registered
Apr 12, 2001
25 years ago
IPv4 Prefixes
4
98,816 addresses
IPv6 Prefixes
0
BGP Neighbours
5
5 upstream/peer · 0 downstream
Registration
AS Number AS20252 AS Name JSIWMC Organization Joan and Sanford I. Weill Medical College and Graduate School of Medical Sciences of Cornell University Organization ID JOANAN Address 1300 York Avenue, New York, NY, 10065, United States Country United States (US) Registry ARIN Allocated Apr 12, 2001 Record Created Apr 12, 2001 Last Updated Feb 24, 2012 Status
active
WHOIS Server whois.arin.net AS Description JSIWMC - Joan and Sanford I. Weill Medical College and Graduate School of Medical Sciences of Cornell University, US Abuse Email [email protected] Abuse Phone +1-212-746-4878 IPv4 Prefixes
4 prefixes · 98,816 addresses Routing data as of 2026-10-09 08:00 UTC
| Prefix | Range | Addresses |
|---|---|---|
| 38.146.193.0/24 | 38.146.193.0 – 38.146.193.255 | 256 |
| 140.251.0.0/17 | 140.251.0.0 – 140.251.127.255 | 32,768 |
| 157.139.0.0/16 | 157.139.0.0 – 157.139.255.255 | 65,536 |
| 207.162.253.0/24 | 207.162.253.0 – 207.162.253.255 | 256 |
IPv6 Prefixes
This AS does not currently announce any IPv6 prefixes.
BGP Neighbours
5 unique neighbours · 5 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 (5)
Raw RDAP Response
{
"endAutnum": 20252,
"entities": [
{
"entities": [
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2023-08-15T10:16:47-04:00"
},
{
"eventAction": "registration",
"eventDate": "2002-11-06T11:00:06-05:00"
}
],
"handle": "NOC216-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/NOC216-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/20252"
},
{
"href": "https://whois.arin.net/rest/poc/NOC216-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/20252"
}
],
"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 2024-08-14"
],
"title": "Unvalidated POC"
}
],
"roles": [
"technical",
"noc"
],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"adr",
{
"label": "Information Technologies & Services Department\n1300 York Ave Box 12\nNew York\nNY\n10065\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"fn",
{},
"text",
"Network Operations Center"
],
[
"org",
{},
"text",
"Joan and Sanford I. Weill Medical College and Graduate School of Medical Sciences of Cornell University"
],
[
"kind",
{},
"text",
"group"
],
[
"email",
{},
"text",
"[email protected]"
],
[
"tel",
{
"type": [
"work",
"voice"
]
},
"text",
"+1-212-746-4878"
]
]
]
},
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2023-11-16T07:25:23-05:00"
},
{
"eventAction": "registration",
"eventDate": "2002-11-06T11:00:08-05:00"
}
],
"handle": "ISAR-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/ISAR-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/20252"
},
{
"href": "https://whois.arin.net/rest/poc/ISAR-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/20252"
}
],
"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 2024-11-15"
],
"title": "Unvalidated POC"
}
],
"roles": [
"abuse"
],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"adr",
{
"label": "Information Technologies & Services Department\n1300 York Avenue, Box 12\nNew York\nNY\n10065\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"fn",
{},
"text",
"Information Security Abuse Response"
],
[
"org",
{},
"text",
"Joan and Sanford I. Weill Medical College and Graduate School of Medical Sciences of Cornell University"
],
[
"kind",
{},
"text",
"group"
],
[
"email",
{},
"text",
"[email protected]"
],
[
"tel",
{
"type": [
"work",
"voice"
]
},
"text",
"+1-212-746-4878"
]
]
]
},
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2024-08-14T16:56:36-04:00"
},
{
"eventAction": "registration",
"eventDate": "1997-04-22T14:54:40-04:00"
}
],
"handle": "VIV3-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/VIV3-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/20252"
},
{
"href": "https://whois.arin.net/rest/poc/VIV3-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/20252"
}
],
"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 2025-08-14"
],
"title": "Unvalidated POC"
}
],
"roles": [
"administrative"
],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"fn",
{},
"text",
"REDACTED"
],
[
"kind",
{},
"text",
"individual"
]
]
]
}
],
"events": [
{
"eventAction": "last changed",
"eventDate": "2013-07-31T11:04:42-04:00"
},
{
"eventAction": "registration",
"eventDate": "2000-06-07T00:00:00-04:00"
}
],
"handle": "JOANAN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/JOANAN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/20252"
},
{
"href": "https://whois.arin.net/rest/org/JOANAN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/20252"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
"registrant"
],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"fn",
{},
"text",
"Joan and Sanford I. Weill Medical College and Graduate School of Medical Sciences of Cornell University"
],
[
"adr",
{
"label": "1300 York Avenue\nNew York\nNY\n10065\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"kind",
{},
"text",
"org"
]
]
]
},
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2024-08-14T16:56:36-04:00"
},
{
"eventAction": "registration",
"eventDate": "1997-04-22T14:54:40-04:00"
}
],
"handle": "VIV3-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/VIV3-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/20252"
},
{
"href": "https://whois.arin.net/rest/poc/VIV3-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/20252"
}
],
"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 2025-08-14"
],
"title": "Unvalidated POC"
}
],
"roles": [
"technical"
],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"fn",
{},
"text",
"REDACTED"
],
[
"kind",
{},
"text",
"individual"
]
]
]
}
],
"events": [
{
"eventAction": "last changed",
"eventDate": "2012-02-24T09:44:34-05:00"
},
{
"eventAction": "registration",
"eventDate": "2001-04-12T00:00:00-04:00"
}
],
"handle": "AS20252",
"links": [
{
"href": "https://rdap.arin.net/registry/autnum/20252",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/20252"
},
{
"href": "https://whois.arin.net/rest/asn/AS20252",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/20252"
}
],
"name": "JSIWMC",
"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/20252"
}
],
"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/20252"
}
],
"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": 20252,
"status": [
"active"
]
} Contact details of private individuals are redacted.