Organization
Institute for Defense Analyses
IDA-AS
Registered
Mar 29, 1988
38 years ago
IPv4 Prefixes
18
131,328 addresses
IPv6 Prefixes
0
BGP Neighbours
2
2 upstream/peer · 0 downstream
Registration
AS Number AS166 AS Name IDA-AS Organization Institute for Defense Analyses Organization ID IDA-2-Z Address 730 E Glebe Rd, Alexandria, VA, 22305, United States Country United States (US) Registry ARIN Allocated Mar 29, 1988 Record Created Mar 29, 1988 Last Updated May 20, 2022 Status
active
WHOIS Server whois.arin.net AS Description IDA-AS - Institute for Defense Analyses, US Abuse Email [email protected] Abuse Phone +1-703-845-6833 IPv4 Prefixes
18 prefixes · 131,328 addresses · 5 top-level Routing data as of 2026-10-14 16:00 UTC
| Prefix | Range | Addresses |
|---|---|---|
| 129.246.0.0/17 | 129.246.0.0 – 129.246.127.255 | 32,768 |
| 129.246.101.0/24 | 129.246.101.0 – 129.246.101.255 | 256 |
| 129.246.128.0/17 | 129.246.128.0 – 129.246.255.255 | 32,768 |
| 129.246.225.0/24 | 129.246.225.0 – 129.246.225.255 | 256 |
| 129.246.228.0/24 | 129.246.228.0 – 129.246.228.255 | 256 |
| 129.246.229.0/24 | 129.246.229.0 – 129.246.229.255 | 256 |
| 129.246.230.0/24 | 129.246.230.0 – 129.246.230.255 | 256 |
| 129.246.235.0/24 | 129.246.235.0 – 129.246.235.255 | 256 |
| 129.246.243.0/24 | 129.246.243.0 – 129.246.243.255 | 256 |
| 129.246.253.0/24 | 129.246.253.0 – 129.246.253.255 | 256 |
| 129.246.254.0/24 | 129.246.254.0 – 129.246.254.255 | 256 |
| 164.217.0.0/17 | 164.217.0.0 – 164.217.127.255 | 32,768 |
| 164.217.128.0/17 | 164.217.128.0 – 164.217.255.255 | 32,768 |
| 164.217.225.0/24 | 164.217.225.0 – 164.217.225.255 | 256 |
| 164.217.228.0/24 | 164.217.228.0 – 164.217.228.255 | 256 |
| 164.217.253.0/24 | 164.217.253.0 – 164.217.253.255 | 256 |
| 164.217.254.0/24 | 164.217.254.0 – 164.217.254.255 | 256 |
| 198.133.241.0/24 | 198.133.241.0 – 198.133.241.255 | 256 |
IPv6 Prefixes
This AS does not currently announce any IPv6 prefixes.
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": 166,
"entities": [
{
"entities": [
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2026-01-05T07:45:04-05:00"
},
{
"eventAction": "registration",
"eventDate": "2008-11-20T10:06:06-05:00"
}
],
"handle": "CMU49-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/CMU49-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/166"
},
{
"href": "https://whois.arin.net/rest/poc/CMU49-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/166"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
"administrative",
"technical",
"abuse"
],
"status": [
"validated"
],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"adr",
{
"label": "730 E Glebe Rd\nAlexandria\nVA\n22305\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"fn",
{},
"text",
"Chris Murphy"
],
[
"n",
{},
"text",
[
"Murphy",
"Chris",
"",
"",
""
]
],
[
"kind",
{},
"text",
"individual"
],
[
"email",
{},
"text",
"[email protected]"
],
[
"tel",
{
"type": [
"work",
"voice"
]
},
"text",
"+1-703-845-6833"
]
]
]
},
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2025-11-17T13:24:22-05:00"
},
{
"eventAction": "registration",
"eventDate": "2025-11-17T13:24:22-05:00"
}
],
"handle": "TPHID-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/TPHID-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/166"
},
{
"href": "https://whois.arin.net/rest/poc/TPHID-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/166"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
"routing",
"noc",
"technical"
],
"status": [
"validated"
],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"adr",
{
"label": "730 E Glebe Road\nAlexandria\nVA\n22305\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"fn",
{},
"text",
"TPH61-IDA"
],
[
"org",
{},
"text",
"Institute for Defense Analyses"
],
[
"kind",
{},
"text",
"group"
],
[
"email",
{},
"text",
"[email protected]"
],
[
"tel",
{
"type": [
"work",
"voice"
]
},
"text",
"+1-703-845-2518"
]
]
]
}
],
"events": [
{
"eventAction": "last changed",
"eventDate": "2025-11-17T13:28:56-05:00"
},
{
"eventAction": "registration",
"eventDate": "2010-02-01T08:37:31-05:00"
}
],
"handle": "IDA-2-Z",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/IDA-2-Z",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/166"
},
{
"href": "https://whois.arin.net/rest/org/IDA-2-Z",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/166"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
"registrant"
],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"fn",
{},
"text",
"Institute for Defense Analyses"
],
[
"adr",
{
"label": "730 E Glebe Rd\nAlexandria\nVA\n22305\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"kind",
{},
"text",
"org"
]
]
]
}
],
"events": [
{
"eventAction": "last changed",
"eventDate": "2022-05-20T14:20:32-04:00"
},
{
"eventAction": "registration",
"eventDate": "1988-03-29T00:00:00-05:00"
}
],
"handle": "AS166",
"links": [
{
"href": "https://rdap.arin.net/registry/autnum/166",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/autnum/166"
},
{
"href": "https://whois.arin.net/rest/asn/AS166",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/autnum/166"
}
],
"name": "IDA-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/166"
}
],
"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/166"
}
],
"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": 166,
"status": [
"active"
]
} Contact details of private individuals are redacted.