Report for 40016

Name

MESIROW - MESIROW FINANCIAL HOLDINGS, INC., 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.

40016 MESIROW - MESIROW FINANCIAL HOLDINGS, INC., US

  Adjacency:     2  Upstream:     2  Downstream:     0
  Upstream Adjacent AS list
    AS23352         SERVERCENTRAL - DEFT.COM, US
    AS174           COGENT-174 - Cogent Communications, LLC, US

Announced Prefixes

Rank  AS       Type    Originate Addr Space  (pfx)   Transit Addr space  (pfx)  Description
49781 AS40016        ORIGIN  Originate:        512 /23.00  Transit:          0 /0.00  MESIROW - MESIROW FINANCIAL HOLDINGS, INC., 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       %
41915 AS40016       MESIROW - MESIROW FINANCIAL HOLDINGS, INC., U      2      0      0      2      0   0.00%


  Prefix               AS Path                              Aggregation Suggestion
  204.153.74.0/24      4777 2497 3257 23352 40016   
  207.252.173.0/24     4777 2516 174 40016    

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

AS40016   2 More Specifics   2 Total Advertisements   MESIROW - MESIROW FINANCIAL HOLDINGS, INC., US
    204.153.74.0/24               204.153.74.0/23
    207.252.173.0/24              207.252.0.0/16

Whois Entry

whois: 402332

IANA has recorded AS40016 as originally allocated by 
/usr/bin/whois -h jwhois.apnic.netr "AS40016\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:       40016
             ASName:         MESIROW
             ASHandle:       AS40016
             RegDate:        2006-06-07
             Updated:        2006-06-07
             Ref:            https://rdap.arin.net/registry/autnum/40016
             
             
             OrgName:        MESIROW FINANCIAL HOLDINGS, INC.
             OrgId:          MFH-7
             Address:        350 N CLARK ST
             City:           CHICAGO
             StateProv:      IL
             PostalCode:     60610
             Country:        US
             RegDate:        2006-05-18
             Updated:        2014-10-28
             Ref:            https://rdap.arin.net/registry/entity/MFH-7
             
             
             OrgTechHandle: PL345-ARIN
             OrgTechName:   Letarte, Phil 
             OrgTechPhone:  +1-312-595-6710 
             OrgTechEmail:  pletarte@mesirowfinancial.com
             OrgTechRef:    https://rdap.arin.net/registry/entity/PL345-ARIN
             
             OrgAbuseHandle: PDO24-ARIN
             OrgAbuseName:   Dockins, Paul 
             OrgAbusePhone:  +1-312-595-6943 
             OrgAbuseEmail:  pdockins@mesirowfinancial.com
             OrgAbuseRef:    https://rdap.arin.net/registry/entity/PDO24-ARIN
             
             OrgTechHandle: PDO24-ARIN
             OrgTechName:   Dockins, Paul 
             OrgTechPhone:  +1-312-595-6943 
             OrgTechEmail:  pdockins@mesirowfinancial.com
             OrgTechRef:    https://rdap.arin.net/registry/entity/PDO24-ARIN
             
             OrgTechHandle: STEVE130-ARIN
             OrgTechName:   Wiley, Steven A
             OrgTechPhone:  +1-312-595-6258 
             OrgTechEmail:  swiley@mesirowfinancial.com
             OrgTechRef:    https://rdap.arin.net/registry/entity/STEVE130-ARIN
             
             RTechHandle: PL345-ARIN
             RTechName:   Letarte, Phil 
             RTechPhone:  +1-312-595-6710 
             RTechEmail:  pletarte@mesirowfinancial.com
             RTechRef:    https://rdap.arin.net/registry/entity/PL345-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.
             #