Autonomous system profile

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

AS27321

Announcement observedARIN

Internet Systems Consortium, Inc. · ISC-F-AS

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

Last active10/23/2026, 09:26:59Snapshot expired

View network topology RDAP registration

ASN: AS27321
Registration country: United States
Name: Internet Systems Consortium, Inc.
Abbreviation: ISC-F-AS
Registration date: 2/12/2003, 19:56:00
Status: Announcement observed
RIR: ARIN

Network relationships and announced prefixes

ASN / prefix	Description / organization	Geographic scope	First seen	Last active	IPv4	IPv6	Status
149.20.0.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/17/2026, 16:00:00	10/23/2026, 00:00:00	✓	×	Currently valid
149.20.2.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/17/2026, 16:00:00	10/23/2026, 00:00:00	✓	×	Currently valid
149.20.3.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/17/2026, 16:00:00	10/23/2026, 00:00:00	✓	×	Currently valid
149.20.4.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/17/2026, 16:00:00	10/23/2026, 00:00:00	✓	×	Currently valid
149.20.57.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/17/2026, 16:00:00	10/23/2026, 00:00:00	✓	×	Currently valid
149.20.66.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/17/2026, 16:00:00	10/23/2026, 00:00:00	✓	×	Currently valid
192.158.248.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/17/2026, 16:00:00	10/23/2026, 00:00:00	✓	×	Currently valid
192.158.249.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/17/2026, 16:00:00	10/23/2026, 00:00:00	✓	×	Currently valid

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

Registration and sources

Organization: Internet Systems Consortium, Inc.
RIR: ARIN
Registration country: United States
Registration date: 2/12/2003, 19:56:00
Abuse contact: abuse@isc.org

Snapshot trend

10/23/2026, 09:26:598 v41 v63 Upstream · 1 Uncertain

10/1/2026, 22:58:118 v41 v65 Upstream · 2 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