AS18438 — BROWNB
AS18438 announces 9 IPv4 prefixes covering 5,120 addresses and 0 IPv6 prefixes.
About this network
BROWNB is the autonomous system for Brown Brothers Harriman & Company.
What it's used for
- The address space carries corporate infrastructure, evidenced by netnames BBHNET, BBHNET1, and BBHNET8 registered to Brown Brothers Harriman & Company.
- The AS announces 5120 IPv4 addresses across 9 prefixes with 9 observed neighbours, indicating a small, self-contained corporate network rather than a transit or access provider.
Notable
- Registrants align with the announcer for most prefixes, listing Brown Brothers Harriman & Company or Brown Brothers Harriman & Co., though two prefixes (192.200.4.0/22 and 192.200.2.0/23) are registered to "Various Registries (Maintained by ARIN)" with netname NET192.
- The inventory consists of a mix of /21, /22, /23, and /24 blocks, primarily in the 204.136.0.0/16 and 192.200.0.0/16 ranges, with no IPv6 prefixes announced.
This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.
Announced prefixes
- 192.200.1.0/24
- 192.200.2.0/23
- 192.200.4.0/22
- 192.200.8.0/24
- 204.136.16.0/24
- 204.136.19.0/24
- 204.136.20.0/24
- 204.136.23.0/24
- 204.136.24.0/21
Upstream networks
- AS55002 F5, Inc.
- AS174 Cogent Communications, LLC
- AS3356 Level 3 Parent, LLC
- AS46887 Crown Castle Fiber LLC
- AS54004 Cablevision Lightpath LLC
- AS2516 KDDI CORPORATION
- AS6461 Zayo Bandwidth
- AS8220 COLT Technology Services Group Limited
- AS9141 P4 Sp. z o.o.
Adjacent networks
BGP / ASN / CIDR
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IPv4
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IPv6
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Search Results
IPv4 Prefixes
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IPv6 Prefixes
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Total Prefixes
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Unique /24s
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⚠ SUSPICIOUS PREFIX ANNOUNCEMENTS DETECTED