Report for 19977

Name

MBRML-AS - Mayer Brown LLP, 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.

19977 MBRML-AS - Mayer Brown LLP, US

  Adjacency:     2  Upstream:     2  Downstream:     0
  Upstream Adjacent AS list
    AS174           COGENT-174 - Cogent Communications, LLC, US
    AS3356          LEVEL3 - Level 3 Parent, LLC, US

Announced Prefixes

Rank  AS       Type    Originate Addr Space  (pfx)   Transit Addr space  (pfx)  Description
16752 AS19977        ORIGIN  Originate:       4096 /20.00  Transit:          0 /0.00  MBRML-AS - Mayer Brown LLP, 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       %
 6264 AS19977       MBRML-AS - Mayer Brown LLP, US                    10      8      1      3      7  70.00%


  Prefix               AS Path                              Aggregation Suggestion
  143.58.0.0/22        4777 2497 174 19977    
  143.58.0.0/22        4777 2516 174 19977  + Announce - aggregate of 143.58.0.0/23 (4777 2516 174 19977) and 143.58.2.0/23 (4777 2516 174 19977)
  143.58.0.0/24        4777 2516 174 19977  - Withdrawn - aggregated with 143.58.1.0/24 (4777 2516 174 19977)
  143.58.1.0/24        4777 2516 174 19977  - Withdrawn - aggregated with 143.58.0.0/24 (4777 2516 174 19977)
  143.58.2.0/24        4777 2516 174 19977  - Withdrawn - aggregated with 143.58.3.0/24 (4777 2516 174 19977)
  143.58.3.0/24        4777 2516 174 19977  - Withdrawn - aggregated with 143.58.2.0/24 (4777 2516 174 19977)
  143.58.4.0/22        4777 2516 3356 19977   
  143.58.4.0/24        4777 2516 3356 19977 - Withdrawn - matching aggregate 143.58.4.0/22 4777 2516 3356 19977
  143.58.5.0/24        4777 2516 3356 19977 - Withdrawn - matching aggregate 143.58.4.0/22 4777 2516 3356 19977
  143.58.6.0/24        4777 2516 3356 19977 - Withdrawn - matching aggregate 143.58.4.0/22 4777 2516 3356 19977
  143.58.7.0/24        4777 2516 3356 19977 - Withdrawn - matching aggregate 143.58.4.0/22 4777 2516 3356 19977

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

AS19977   10 More Specifics   10 Total Advertisements   MBRML-AS - Mayer Brown LLP, US
    143.58.0.0/22                 143.58.0.0/18
    143.58.0.0/24                 143.58.0.0/18
    143.58.1.0/24                 143.58.0.0/18
    143.58.2.0/24                 143.58.0.0/18
    143.58.3.0/24                 143.58.0.0/18
    143.58.4.0/22                 143.58.0.0/18
    143.58.4.0/24                 143.58.0.0/18
    143.58.5.0/24                 143.58.0.0/18
    143.58.6.0/24                 143.58.0.0/18
    143.58.7.0/24                 143.58.0.0/18

Whois Entry

whois: 402332

IANA has recorded AS19977 as originally allocated by 
/usr/bin/whois -h jwhois.apnic.netr "AS19977\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:       19977
             ASName:         MBRML-AS
             ASHandle:       AS19977
             RegDate:        2016-08-02
             Updated:        2016-08-02
             Ref:            https://rdap.arin.net/registry/autnum/19977
             
             
             OrgName:        Mayer Brown LLP
             OrgId:          MBRML
             Address:        71 S. Wacker
             City:           Chicago
             StateProv:      IL
             PostalCode:     60606
             Country:        US
             RegDate:        2006-01-12
             Updated:        2016-07-12
             Ref:            https://rdap.arin.net/registry/entity/MBRML
             
             
             OrgTechHandle: MCS7-ARIN
             OrgTechName:   Sherman, Michael C
             OrgTechPhone:  +1-312-701-8315 
             OrgTechEmail:  msherman@mayerbrown.com
             OrgTechRef:    https://rdap.arin.net/registry/entity/MCS7-ARIN
             
             OrgAbuseHandle: MCS7-ARIN
             OrgAbuseName:   Sherman, Michael C
             OrgAbusePhone:  +1-312-701-8315 
             OrgAbuseEmail:  msherman@mayerbrown.com
             OrgAbuseRef:    https://rdap.arin.net/registry/entity/MCS7-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.
             #