Organization
ESnet
ESNET-AS
Registered
Feb 17, 1994
32 years ago
IPv4 Prefixes
5
68,352 addresses
IPv6 Prefixes
1
16 × /48
BGP Neighbours
2
2 upstream/peer · 0 downstream
Registration
AS Number AS3428 Registered Block AS3425 – AS3444 AS Name ESNET-AS Handle AS3425 Organization ESnet Organization ID ENSN-Z Address Berkeley Lab, 1 Cyclotron Road MS 59R3103, Berkeley, CA, 94720, United States Country United States (US) Registry ARIN Allocated Feb 17, 1994 Record Created Feb 17, 1994 Last Updated Apr 10, 2012 Status
active
WHOIS Server whois.arin.net AS Description ESNET-AS - ESnet, US Abuse Email [email protected] Abuse Phone +1-510-486-7607 IPv4 Prefixes
5 prefixes · 68,352 addresses Routing data as of 2026-10-09 16:00 UTC
| Prefix | Range | Addresses |
|---|---|---|
| 130.20.0.0/16 | 130.20.0.0 – 130.20.255.255 | 65,536 |
| 192.35.193.0/24 | 192.35.193.0 – 192.35.193.255 | 256 |
| 192.101.100.0/22 | 192.101.100.0 – 192.101.103.255 | 1,024 |
| 192.101.104.0/22 | 192.101.104.0 – 192.101.107.255 | 1,024 |
| 192.101.108.0/23 | 192.101.108.0 – 192.101.109.255 | 512 |
IPv6 Prefixes
1 prefix · 16 × /48 Routing data as of 2026-10-09 16:00 UTC
| Prefix | Addresses |
|---|---|
| 2620:0:50f0:: | 284 |
BGP Neighbours
2 unique neighbours · 2 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 (2)
Raw RDAP Response
{
"endAutnum": 3444,
"entities": [
{
"entities": [
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2026-07-21T11:07:25-04:00"
}
],
"handle": "EH1-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/EH1-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/3428"
},
{
"href": "https://whois.arin.net/rest/poc/EH1-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/3428"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
"technical",
"abuse",
"administrative"
],
"status": [
"validated"
],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"adr",
{
"label": "One Cyclotron Road\r\nMS-59R3103\nBerkeley\nCA\n94720\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"fn",
{},
"text",
"Energy Sciences Network"
],
[
"org",
{},
"text",
"Lawrence Berkeley National Laboratory - Energy Sciences Network"
],
[
"kind",
{},
"text",
"group"
],
[
"email",
{},
"text",
"[email protected]"
],
[
"tel",
{
"type": [
"work",
"voice"
]
},
"text",
"+1-510-486-7607"
]
]
]
}
],
"events": [
{
"eventAction": "last changed",
"eventDate": "2023-10-04T10:36:12-04:00"
},
{
"eventAction": "registration",
"eventDate": "2010-01-22T18:00:19-05:00"
}
],
"handle": "ENSN-Z",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/ENSN-Z",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/3428"
},
{
"href": "https://whois.arin.net/rest/org/ENSN-Z",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/3428"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
"registrant"
],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"fn",
{},
"text",
"ESnet"
],
[
"adr",
{
"label": "Berkeley Lab\r\n1 Cyclotron Road MS 59R3103\nBerkeley\nCA\n94720\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"kind",
{},
"text",
"org"
]
]
]
}
],
"events": [
{
"eventAction": "last changed",
"eventDate": "2012-04-10T17:42:10-04:00"
},
{
"eventAction": "registration",
"eventDate": "1994-02-17T00:00:00-05:00"
}
],
"handle": "AS3425",
"links": [
{
"href": "https://rdap.arin.net/registry/autnum/3425",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/3428"
},
{
"href": "https://whois.arin.net/rest/asn/AS3425",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/3428"
}
],
"name": "ESNET-AS",
"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/3428"
}
],
"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/3428"
}
],
"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": 3425,
"status": [
"active"
]
} Contact details of private individuals are redacted.