Organization
COSTAR GROUP Inc.
COSTARGROUPASN
Registered
Jan 20, 2000
26 years ago
IPv4 Prefixes
10
3,072 addresses
IPv6 Prefixes
0
BGP Neighbours
4
4 upstream/peer · 0 downstream
Registration
AS Number AS14652 AS Name COSTARGROUPASN Organization COSTAR GROUP Inc. Organization ID COSTAR-2 Address 1331 L St N.W., Washington, DC, 20005-4293, United States Country United States (US) Registry ARIN Allocated Jan 20, 2000 Record Created Jan 20, 2000 Last Updated Aug 01, 2024 Status
active
WHOIS Server whois.arin.net AS Description COSTARGROUPASN - COSTAR GROUP Inc., US Abuse Email [email protected] Abuse Phone +1-202-336-6960 IPv4 Prefixes
10 prefixes · 3,072 addresses Routing data as of 2026-10-09 00:00 UTC
| Prefix | Range | Addresses |
|---|---|---|
| 8.39.162.0/24 | 8.39.162.0 – 8.39.162.255 | 256 |
| 8.43.77.0/24 | 8.43.77.0 – 8.43.77.255 | 256 |
| 38.103.15.0/24 | 38.103.15.0 – 38.103.15.255 | 256 |
| 38.109.150.0/24 | 38.109.150.0 – 38.109.150.255 | 256 |
| 63.86.105.0/24 | 63.86.105.0 – 63.86.105.255 | 256 |
| 65.210.23.0/24 | 65.210.23.0 – 65.210.23.255 | 256 |
| 65.210.120.0/24 | 65.210.120.0 – 65.210.120.255 | 256 |
| 65.222.180.0/23 | 65.222.180.0 – 65.222.181.255 | 512 |
| 65.246.30.0/24 | 65.246.30.0 – 65.246.30.255 | 256 |
| 97.65.16.0/23 | 97.65.16.0 – 97.65.17.255 | 512 |
IPv6 Prefixes
This AS does not currently announce any IPv6 prefixes.
BGP Neighbours
4 unique neighbours · 4 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 (4)
Raw RDAP Response
{
"endAutnum": 14652,
"entities": [
{
"entities": [
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2024-09-19T08:53:31-04:00"
},
{
"eventAction": "registration",
"eventDate": "2018-10-30T16:57:32-04:00"
}
],
"handle": "STONG5-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/STONG5-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/14652"
},
{
"href": "https://whois.arin.net/rest/poc/STONG5-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/14652"
}
],
"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 2025-09-19"
],
"title": "Unvalidated POC"
}
],
"roles": [
"administrative",
"technical",
"abuse"
],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"adr",
{
"label": "1331 L St N.W.\nWashington\nDC\n20005\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"fn",
{},
"text",
"Ian Stong"
],
[
"n",
{},
"text",
[
"Stong",
"Ian",
"",
"",
""
]
],
[
"kind",
{},
"text",
"individual"
],
[
"email",
{},
"text",
"[email protected]"
],
[
"tel",
{
"type": [
"work",
"voice"
]
},
"text",
"+1-202-336-6960"
]
]
]
},
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2026-09-02T14:00:35-04:00"
},
{
"eventAction": "registration",
"eventDate": "2024-07-31T15:23:20-04:00"
}
],
"handle": "CNT13-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/CNT13-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/14652"
},
{
"href": "https://whois.arin.net/rest/poc/CNT13-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/14652"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
"dns",
"abuse",
"noc",
"technical",
"routing"
],
"status": [
"validated"
],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"adr",
{
"label": "1201 Wilson Blvd\nArlington\nVA\n22209\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"fn",
{},
"text",
"Costar Network Team"
],
[
"org",
{},
"text",
"CoStar Group"
],
[
"kind",
{},
"text",
"group"
],
[
"email",
{},
"text",
"[email protected]"
],
[
"tel",
{
"type": [
"work",
"voice"
]
},
"text",
"+1-800-204-5960"
]
]
]
}
],
"events": [
{
"eventAction": "last changed",
"eventDate": "2024-08-12T14:54:54-04:00"
},
{
"eventAction": "registration",
"eventDate": "2000-01-06T00:00:00-05:00"
}
],
"handle": "COSTAR-2",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/COSTAR-2",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/14652"
},
{
"href": "https://whois.arin.net/rest/org/COSTAR-2",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/14652"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
"registrant"
],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"fn",
{},
"text",
"COSTAR GROUP Inc."
],
[
"adr",
{
"label": "1331 L St N.W.\nWashington\nDC\n20005-4293\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"kind",
{},
"text",
"org"
]
]
]
},
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2000-02-25T02:07:45-05:00"
},
{
"eventAction": "registration",
"eventDate": "2000-01-03T23:07:02-05:00"
}
],
"handle": "TC346-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/TC346-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/14652"
},
{
"href": "https://whois.arin.net/rest/poc/TC346-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/14652"
}
],
"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 2010-06-21"
],
"title": "Unvalidated POC"
}
],
"roles": [
"technical"
],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"fn",
{},
"text",
"REDACTED"
],
[
"kind",
{},
"text",
"individual"
]
]
]
}
],
"events": [
{
"eventAction": "last changed",
"eventDate": "2024-08-01T11:51:30-04:00"
},
{
"eventAction": "registration",
"eventDate": "2000-01-20T00:00:00-05:00"
}
],
"handle": "AS14652",
"links": [
{
"href": "https://rdap.arin.net/registry/autnum/14652",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/14652"
},
{
"href": "https://whois.arin.net/rest/asn/AS14652",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/14652"
}
],
"name": "COSTARGROUPASN",
"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/14652"
}
],
"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/14652"
}
],
"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": 14652,
"status": [
"active"
]
} Contact details of private individuals are redacted.