Autonomous system profile

Review registration details, announced prefixes, network relationships and historical snapshots.

AS166

Announcement observedARIN

Institute for Defense Analyses · IDA-AS

This profile is assembled from CHA.LA's normalized registration, routing and observation snapshots.

Last active10/1/2026, 00:33:05Snapshot expired

View network topology RDAP registration

ASN: AS166
Registration country: United States
Name: Institute for Defense Analyses
Abbreviation: IDA-AS
Registration date: 3/29/1988, 05:00:00
Status: Announcement observed
RIR: ARIN

Network relationships and announced prefixes

ASN / prefix	Description / organization	Geographic scope	First seen	Last active	IPv4	IPv6	Status
129.246.0.0/17BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/14/2026, 16:00:00	10/31/2026, 16:00:00	✓	×	Currently valid
129.246.101.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/14/2026, 16:00:00	10/31/2026, 16:00:00	✓	×	Currently valid
129.246.128.0/17BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/14/2026, 16:00:00	10/31/2026, 16:00:00	✓	×	Currently valid
129.246.225.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/14/2026, 16:00:00	10/31/2026, 16:00:00	✓	×	Currently valid
129.246.228.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/14/2026, 16:00:00	10/31/2026, 16:00:00	✓	×	Currently valid
129.246.229.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/14/2026, 16:00:00	10/31/2026, 16:00:00	✓	×	Currently valid
129.246.230.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/14/2026, 16:00:00	10/31/2026, 16:00:00	✓	×	Currently valid
129.246.235.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/14/2026, 16:00:00	10/31/2026, 16:00:00	✓	×	Currently valid
129.246.243.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/14/2026, 16:00:00	10/31/2026, 16:00:00	✓	×	Currently valid
129.246.253.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/14/2026, 16:00:00	10/31/2026, 16:00:00	✓	×	Currently valid
129.246.254.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/14/2026, 16:00:00	10/31/2026, 16:00:00	✓	×	Currently valid
164.217.0.0/17BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/14/2026, 16:00:00	10/31/2026, 16:00:00	✓	×	Currently valid
164.217.128.0/17BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/14/2026, 16:00:00	10/31/2026, 16:00:00	✓	×	Currently valid
164.217.225.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/14/2026, 16:00:00	10/31/2026, 16:00:00	✓	×	Currently valid
164.217.228.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/14/2026, 16:00:00	10/31/2026, 16:00:00	✓	×	Currently valid
164.217.253.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/14/2026, 16:00:00	10/31/2026, 16:00:00	✓	×	Currently valid
164.217.254.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/14/2026, 16:00:00	10/31/2026, 16:00:00	✓	×	Currently valid
198.133.241.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/14/2026, 16:00:00	10/31/2026, 16:00:00	✓	×	Currently valid

BGP prefixes have no geographic country; the column is marked not applicable.

Registration and sources

Organization: Institute for Defense Analyses
RIR: ARIN
Registration country: United States
Registration date: 3/29/1988, 05:00:00
Abuse contact: cmurphy@ida.org

Snapshot trend

10/1/2026, 00:33:0518 v40 v62 Upstream · 0 Uncertain

9/28/2026, 20:37:2518 v40 v62 Upstream · 0 Uncertain

9/28/2026, 20:32:390 v40 v60 Upstream · 0 Uncertain

9/27/2026, 15:06:370 v40 v60 Upstream · 0 Uncertain

ASN route snapshotThis page reads collected ASN, prefix, relationship and history data. External interfaces are used for initial collection and scheduled refreshes.Source keys: cha-la-external-routing · iana-rdap-asn-bootstrap · rir-rdap-asn