Report for 23397

Name

CME-VEN-AS23397 - Chicago Board of Trade, 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 AS6447) 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.

23397 CME-VEN-AS23397, US

  Adjacency:     2  Upstream:     2  Downstream:     0
  Upstream Adjacent AS list
    AS46887         CROWNCASTLE-AS46887, US
    AS6461          ZAYO-6461, US

Announced Prefixes

Rank  AS       Type    Originate Addr Space  (pfx)   Transit Addr space  (pfx)  Description
48916 AS23397        ORIGIN  Originate:        512 /23.00  Transit:          0 /0.00  CME-VEN-AS23397, 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       %
36796 AS23397       CME-VEN-AS23397, US                                2      0      0      2      0   0.00%


  Prefix               AS Path                              Aggregation Suggestion
  167.204.37.0/24      7018 6461 23397        
  204.10.10.0/24       2497 6461 23397        

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

AS23397   2 More Specifics   2 Total Advertisements   CME-VEN-AS23397, US
    167.204.37.0/24               167.204.0.0/16
    204.10.14.0/24                204.10.8.0/21
    204.10.10.0/24                204.10.8.0/21

Prefixes added and withdrawn by this origin AS in the past 7 days.

    - 204.10.10.0/24              Withdrawn

Whois Entry

whois: 402603

IANA has recorded AS23397 as originally allocated by 
/usr/bin/whois -h jwhois.apnic.netr "AS23397\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:       23397
             ASName:         CME-VEN-AS23397
             ASHandle:       AS23397
             RegDate:        2002-03-12
             Updated:        2026-04-15
             Ref:            https://rdap.arin.net/registry/autnum/23397
             
             
             OrgName:        Chicago Mercantile Exchange
             OrgId:          CME
             Address:        20. South Wacker
             City:           Chicago
             StateProv:      IL
             PostalCode:     60606
             Country:        US
             RegDate:        1994-06-02
             Updated:        2022-03-30
             Ref:            https://rdap.arin.net/registry/entity/CME
             
             
             OrgTechHandle: CMEAR-ARIN
             OrgTechName:   CME-ARIN-Admin
             OrgTechPhone:  +1-312-627-4496 
             OrgTechEmail:  NetworkEngineering@cmegroup.com
             OrgTechRef:    https://rdap.arin.net/registry/entity/CMEAR-ARIN
             
             OrgNOCHandle: NETWO8732-ARIN
             OrgNOCName:   Network Operations
             OrgNOCPhone:  +1-312-627-4496 
             OrgNOCEmail:  networkoperations@cmegroup.com
             OrgNOCRef:    https://rdap.arin.net/registry/entity/NETWO8732-ARIN
             
             OrgAbuseHandle: CMEAR-ARIN
             OrgAbuseName:   CME-ARIN-Admin
             OrgAbusePhone:  +1-312-627-4496 
             OrgAbuseEmail:  NetworkEngineering@cmegroup.com
             OrgAbuseRef:    https://rdap.arin.net/registry/entity/CMEAR-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.
             #