Autonomous system profile

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

AS18438

Announcement observedARIN

BROWNB - Brown Brothers Harriman & Company · BROWNB

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

Last active9/30/2026, 22:15:48Snapshot expired

View network topology RDAP registration

ASN: AS18438
Registration country: United States
Name: BROWNB - Brown Brothers Harriman & Company
Abbreviation: BROWNB
Registration date: 8/29/2000, 04:00:00
Status: Announcement observed
RIR: ARIN

Network relationships and announced prefixes

ASN / prefix	Description / organization	Geographic scope	First seen	Last active	IPv4	IPv6	Status
192.200.1.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/16/2026, 16:00:00	10/22/2026, 08:00:00	✓	×	Currently valid
192.200.2.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/16/2026, 16:00:00	10/22/2026, 08:00:00	✓	×	Currently valid
192.200.3.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/16/2026, 16:00:00	10/22/2026, 08:00:00	✓	×	Currently valid
192.200.4.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/16/2026, 16:00:00	10/22/2026, 08:00:00	✓	×	Currently valid
192.200.5.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/16/2026, 16:00:00	10/22/2026, 08:00:00	✓	×	Currently valid
192.200.6.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/16/2026, 16:00:00	10/22/2026, 08:00:00	✓	×	Currently valid
192.200.7.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/16/2026, 16:00:00	10/22/2026, 08:00:00	✓	×	Currently valid
192.200.8.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/16/2026, 16:00:00	10/22/2026, 08:00:00	✓	×	Currently valid
204.136.16.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/16/2026, 16:00:00	10/22/2026, 08:00:00	✓	×	Currently valid
204.136.19.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/16/2026, 16:00:00	10/22/2026, 08:00:00	✓	×	Currently valid
204.136.20.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/16/2026, 16:00:00	10/22/2026, 08:00:00	✓	×	Currently valid
204.136.23.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/16/2026, 16:00:00	10/22/2026, 08:00:00	✓	×	Currently valid
204.136.24.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/16/2026, 16:00:00	10/22/2026, 08:00:00	✓	×	Currently valid
204.136.25.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/16/2026, 16:00:00	10/22/2026, 08:00:00	✓	×	Currently valid
204.136.26.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/16/2026, 16:00:00	10/22/2026, 08:00:00	✓	×	Currently valid
204.136.27.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/16/2026, 16:00:00	10/22/2026, 08:00:00	✓	×	Currently valid
204.136.28.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/16/2026, 16:00:00	10/22/2026, 08:00:00	✓	×	Currently valid
204.136.29.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/16/2026, 16:00:00	10/22/2026, 08:00:00	✓	×	Currently valid
204.136.30.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/16/2026, 16:00:00	10/22/2026, 08:00:00	✓	×	Currently valid
204.136.31.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/16/2026, 16:00:00	10/22/2026, 08:00:00	✓	×	Currently valid

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

Registration and sources

Organization: BROWNB - Brown Brothers Harriman & Company
RIR: ARIN
Registration country: United States
Registration date: 8/29/2000, 04:00:00
Abuse contact: hostmaster@bbh.com

Snapshot trend

9/30/2026, 22:15:4820 v40 v69 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 · rir-rdap-asn · iana-rdap-asn-bootstrap