Report for 18438

Name

BROWNB - Brown Brothers Harriman & Company, US

AS Adjacency Report

In the context of this report "Upstream" indicates that there is an adjacent AS that lines between the BGP table collection point (in this case at AS2.0) and the specified AS. Similarly, "Downstream" refers to an adjacent AS that lies beyond the specified AS. This upstream / downstream categorisation is strictly a description relative topology, and should not be confused with provider / customer / peer inter-AS relationships.

18438 BROWNB - Brown Brothers Harriman & Company, US

  Adjacency:     8  Upstream:     8  Downstream:     0
  Upstream Adjacent AS list
    AS6461          ZAYO-6461 - Zayo Bandwidth, US
    AS174           COGENT-174 - Cogent Communications, LLC, US
    AS3356          LEVEL3 - Level 3 Parent, LLC, US
    AS8220          COLT COLT Technology Services Group Limited, GB
    AS46887         CROWNCASTLE-AS46887 - Crown Castle Fiber LLC, US
    AS2516          KDDI KDDI CORPORATION, JP
    AS55002         DEFENSE-NET - F5, Inc., US
    AS54004         LIGHTPATH - Cablevision Lightpath LLC, US

Announced Prefixes

Rank  AS       Type    Originate Addr Space  (pfx)   Transit Addr space  (pfx)  Description
15544 AS18438        ORIGIN  Originate:       4864 /19.75  Transit:          0 /0.00  BROWNB - Brown Brothers Harriman & Company, US

Aggregation Suggestions

        Filter: Aggregates, Specifics

This report does not take into account conditions local to each origin AS in terms of policy or traffic engineering requirements, so this is an approximate guideline as to aggregation possibilities.

 Rank AS            AS Name                                      Current  Wthdw  Aggte  Annce Redctn       %
 9994 AS18438       BROWNB - Brown Brothers Harriman & Company, U     19      8      4     15      4  21.05%


  Prefix               AS Path                              Aggregation Suggestion
  192.200.1.0/24       4608 24115 35280 55002 18438   
  192.200.2.0/23       4608 24115 35280 55002 18438 + Announce - aggregate of 192.200.2.0/24 (4608 24115 35280 55002 18438) and 192.200.3.0/24 (4608 24115 35280 55002 18438)
  192.200.2.0/24       4608 24115 35280 55002 18438 - Withdrawn - aggregated with 192.200.3.0/24 (4608 24115 35280 55002 18438)
  192.200.3.0/24       4608 24115 35280 55002 18438 - Withdrawn - aggregated with 192.200.2.0/24 (4608 24115 35280 55002 18438)
  192.200.5.0/24       4608 24115 35280 55002 18438   
  192.200.6.0/23       4608 24115 35280 55002 18438 + Announce - aggregate of 192.200.6.0/24 (4608 24115 35280 55002 18438) and 192.200.7.0/24 (4608 24115 35280 55002 18438)
  192.200.6.0/24       4608 24115 35280 55002 18438 - Withdrawn - aggregated with 192.200.7.0/24 (4608 24115 35280 55002 18438)
  192.200.7.0/24       4608 24115 35280 55002 18438 - Withdrawn - aggregated with 192.200.6.0/24 (4608 24115 35280 55002 18438)
  192.200.8.0/24       4608 24115 35280 55002 18438   
  204.136.16.0/24      4777 2497 174 18438    
  204.136.19.0/24      4608 7575 3356 18438   
  204.136.20.0/24      4777 2516 18438        
  204.136.23.0/24      4777 2497 8220 18438   
  204.136.24.0/23      4777 2516 1299 46887 18438 + Announce - aggregate of 204.136.24.0/24 (4777 2516 1299 46887 18438) and 204.136.25.0/24 (4777 2516 1299 46887 18438)
  204.136.24.0/24      4777 2516 1299 46887 18438 - Withdrawn - aggregated with 204.136.25.0/24 (4777 2516 1299 46887 18438)
  204.136.25.0/24      4777 2516 1299 46887 18438 - Withdrawn - aggregated with 204.136.24.0/24 (4777 2516 1299 46887 18438)
  204.136.26.0/23      4608 24115 35280 55002 18438 + Announce - aggregate of 204.136.26.0/24 (4608 24115 35280 55002 18438) and 204.136.27.0/24 (4608 24115 35280 55002 18438)
  204.136.26.0/24      4608 24115 35280 55002 18438 - Withdrawn - aggregated with 204.136.27.0/24 (4608 24115 35280 55002 18438)
  204.136.27.0/24      4608 24115 35280 55002 18438 - Withdrawn - aggregated with 204.136.26.0/24 (4608 24115 35280 55002 18438)
  204.136.28.0/24      4777 6939 54004 18438   
  204.136.29.0/24      4777 2497 174 18438    
  204.136.30.0/24      4608 24115 35280 55002 18438 18438 18438 18438 18438   
  204.136.31.0/24      4608 7575 3356 18438   

Advertisements that are fragments of the original RIR allocation (more specifics) originated by this AS.

AS18438   12 More Specifics   19 Total Advertisements   BROWNB - Brown Brothers Harriman & Company, US
    204.136.16.0/24               204.136.16.0/20
    204.136.19.0/24               204.136.16.0/20
    204.136.20.0/24               204.136.16.0/20
    204.136.23.0/24               204.136.16.0/20
    204.136.24.0/24               204.136.16.0/20
    204.136.25.0/24               204.136.16.0/20
    204.136.26.0/24               204.136.16.0/20
    204.136.27.0/24               204.136.16.0/20
    204.136.28.0/24               204.136.16.0/20
    204.136.29.0/24               204.136.16.0/20
    204.136.30.0/24               204.136.16.0/20
    204.136.31.0/24               204.136.16.0/20

Whois Entry

whois: 402332

IANA has recorded AS18438 as originally allocated by 
/usr/bin/whois -h jwhois.apnic.netr "AS18438\n             
             #
             # ARIN WHOIS data and services are subject to the Terms of Use
             # available at: https://www.arin.net/resources/registry/whois/tou/
             #
             # If you see inaccuracies in the results, please report at
             # https://www.arin.net/resources/registry/whois/inaccuracy_reporting/
             #
             # Copyright 1997-2026, American Registry for Internet Numbers, Ltd.
             #
             
             
             ASNumber:       18438
             ASName:         BROWNB
             ASHandle:       AS18438
             RegDate:        2000-08-29
             Updated:        2017-04-21
             Ref:            https://rdap.arin.net/registry/autnum/18438
             
             
             OrgName:        Brown Brothers Harriman & Company
             OrgId:          BBH-3
             Address:        Harborside Financial Center
             Address:        185 Hudson Street, Suite 1150
             City:           Jersey City
             StateProv:      NJ
             PostalCode:     07311
             Country:        US
             RegDate:        1992-07-22
             Updated:        2019-08-13
             Ref:            https://rdap.arin.net/registry/entity/BBH-3
             
             
             OrgTechHandle: HOSTM1081-ARIN
             OrgTechName:   hostmaster
             OrgTechPhone:  +1-201-418-5600 
             OrgTechEmail:  hostmaster@bbh.com
             OrgTechRef:    https://rdap.arin.net/registry/entity/HOSTM1081-ARIN
             
             OrgAbuseHandle: HOSTM1081-ARIN
             OrgAbuseName:   hostmaster
             OrgAbusePhone:  +1-201-418-5600 
             OrgAbuseEmail:  hostmaster@bbh.com
             OrgAbuseRef:    https://rdap.arin.net/registry/entity/HOSTM1081-ARIN
             
             RTechHandle: HOSTM1081-ARIN
             RTechName:   hostmaster
             RTechPhone:  +1-201-418-5600 
             RTechEmail:  hostmaster@bbh.com
             RTechRef:    https://rdap.arin.net/registry/entity/HOSTM1081-ARIN
             
             
             #
             # ARIN WHOIS data and services are subject to the Terms of Use
             # available at: https://www.arin.net/resources/registry/whois/tou/
             #
             # If you see inaccuracies in the results, please report at
             # https://www.arin.net/resources/registry/whois/inaccuracy_reporting/
             #
             # Copyright 1997-2026, American Registry for Internet Numbers, Ltd.
             #