Report for 30573

Name

OLDSECONDBANCORP - Old Second Bancorp, 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.

30573 OLDSECONDBANCORP, US

  Adjacency:     2  Upstream:     2  Downstream:     0
  Upstream Adjacent AS list
    AS33491         COMCAST-33491, US
    AS7018          ATT-INTERNET4, US

Announced Prefixes

Rank  AS       Type    Originate Addr Space  (pfx)   Transit Addr space  (pfx)  Description
61036 AS30573        ORIGIN  Originate:        256 /24.00  Transit:          0 /0.00  OLDSECONDBANCORP, 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       %
39115 AS30573       OLDSECONDBANCORP, US                               1      0      0      1      0   0.00%


  Prefix               AS Path                              Aggregation Suggestion
  12.48.114.0/24       57866 3356 33491 30573   

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

AS30573   1 More Specifics   1 Total Advertisements   OLDSECONDBANCORP, US
    12.48.114.0/24                12.0.0.0/8

Whois Entry

whois: 402603

IANA has recorded AS30573 as originally allocated by 
/usr/bin/whois -h jwhois.apnic.netr "AS30573\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:       30573
             ASName:         OLDSECONDBANCORP
             ASHandle:       AS30573
             RegDate:        2003-11-11
             Updated:        2026-05-05
             Ref:            https://rdap.arin.net/registry/autnum/30573
             
             
             OrgName:        Old Second Bancorp
             OrgId:          OSB-9
             Address:        37 South River Street
             City:           Aurora
             StateProv:      IL
             PostalCode:     60506-4172
             Country:        US
             RegDate:        2003-08-27
             Updated:        2011-09-24
             Ref:            https://rdap.arin.net/registry/entity/OSB-9
             
             
             OrgTechHandle: HOSTM308-ARIN
             OrgTechName:   HOSTMASTER
             OrgTechPhone:  +1-630-892-0202 
             OrgTechEmail:  bschluntz@oldsecond.com
             OrgTechRef:    https://rdap.arin.net/registry/entity/HOSTM308-ARIN
             
             OrgAbuseHandle: HOSTM308-ARIN
             OrgAbuseName:   HOSTMASTER
             OrgAbusePhone:  +1-630-892-0202 
             OrgAbuseEmail:  bschluntz@oldsecond.com
             OrgAbuseRef:    https://rdap.arin.net/registry/entity/HOSTM308-ARIN
             
             RTechHandle: HOSTM308-ARIN
             RTechName:   HOSTMASTER
             RTechPhone:  +1-630-892-0202 
             RTechEmail:  bschluntz@oldsecond.com
             RTechRef:    https://rdap.arin.net/registry/entity/HOSTM308-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.
             #