Report for 3743

Name

ARCEL-2 - Cleveland Cliffs Steel LLC, 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.

3743 ARCEL-2 - Cleveland Cliffs Steel LLC, US

  Adjacency:     1  Upstream:     1  Downstream:     0
  Upstream Adjacent AS list
    AS209           CENTURYLINK-US-LEGACY-QWEST - CenturyLink Communications, LLC, US

Announced Prefixes

Rank  AS       Type    Originate Addr Space  (pfx)   Transit Addr space  (pfx)  Description
28655 AS3743         ORIGIN  Originate:       1792 /21.19  Transit:          0 /0.00  ARCEL-2 - Cleveland Cliffs Steel LLC, 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       %
20173 AS3743        ARCEL-2 - Cleveland Cliffs Steel LLC, US           7      2      1      6      1  14.29%


  Prefix               AS Path                              Aggregation Suggestion
  156.144.51.0/24      4777 2497 3356 209 3743   
  156.144.99.0/24      4777 2497 3356 209 3743   
  156.144.100.0/24     4777 2497 3356 209 3743   
  156.144.108.0/23     4777 2497 3356 209 3743 + Announce - aggregate of 156.144.108.0/24 (4777 2497 3356 209 3743) and 156.144.109.0/24 (4777 2497 3356 209 3743)
  156.144.108.0/24     4777 2497 3356 209 3743 - Withdrawn - aggregated with 156.144.109.0/24 (4777 2497 3356 209 3743)
  156.144.109.0/24     4777 2497 3356 209 3743 - Withdrawn - aggregated with 156.144.108.0/24 (4777 2497 3356 209 3743)
  156.144.208.0/24     4777 2516 3356 209 3743   
  156.144.249.0/24     4777 2497 3356 209 3743   

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

AS3743   7 More Specifics   7 Total Advertisements   ARCEL-2 - Cleveland Cliffs Steel LLC, US
    156.144.51.0/24               156.144.0.0/16
    156.144.99.0/24               156.144.0.0/16
    156.144.100.0/24              156.144.0.0/16
    156.144.108.0/24              156.144.0.0/16
    156.144.109.0/24              156.144.0.0/16
    156.144.208.0/24              156.144.0.0/16
    156.144.249.0/24              156.144.0.0/16

Whois Entry

whois: 402591

IANA has recorded AS3743 as originally allocated by 
/usr/bin/whois -h jwhois.apnic.netr "AS3743\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:       3743
             ASName:         ARCEL-2
             ASHandle:       AS3743
             RegDate:        2009-09-09
             Updated:        2023-06-30
             Comment:        WDS3-ARIN00
             Ref:            https://rdap.arin.net/registry/autnum/3743
             
             
             OrgName:        Cleveland Cliffs Steel LLC
             OrgId:          ARCEL-2
             Address:        1 SOUTH DEARBORN, 19TH FLOOR
             City:           CHICAGO
             StateProv:      IL
             PostalCode:     60603
             Country:        US
             RegDate:        2009-08-14
             Updated:        2025-11-24
             Ref:            https://rdap.arin.net/registry/entity/ARCEL-2
             
             
             OrgNOCHandle: ABUSE9467-ARIN
             OrgNOCName:   Abuse
             OrgNOCPhone:  +1-216-694-5700 
             OrgNOCEmail:  arinadmin@clevelandcliffs.com
             OrgNOCRef:    https://rdap.arin.net/registry/entity/ABUSE9467-ARIN
             
             OrgAbuseHandle: ABUSE9467-ARIN
             OrgAbuseName:   Abuse
             OrgAbusePhone:  +1-216-694-5700 
             OrgAbuseEmail:  arinadmin@clevelandcliffs.com
             OrgAbuseRef:    https://rdap.arin.net/registry/entity/ABUSE9467-ARIN
             
             OrgTechHandle: ABUSE9467-ARIN
             OrgTechName:   Abuse
             OrgTechPhone:  +1-216-694-5700 
             OrgTechEmail:  arinadmin@clevelandcliffs.com
             OrgTechRef:    https://rdap.arin.net/registry/entity/ABUSE9467-ARIN
             
             RTechHandle: MPC47-ARIN
             RTechName:   Collins, Michelle P
             RTechPhone:  +1-513-425-5000 
             RTechEmail:  michelle.collins@clevelandcliffs.com
             RTechRef:    https://rdap.arin.net/registry/entity/MPC47-ARIN
             
             RAbuseHandle: MPC47-ARIN
             RAbuseName:   Collins, Michelle P
             RAbusePhone:  +1-513-425-5000 
             RAbuseEmail:  michelle.collins@clevelandcliffs.com
             RAbuseRef:    https://rdap.arin.net/registry/entity/MPC47-ARIN
             
             RNOCHandle: MPC47-ARIN
             RNOCName:   Collins, Michelle P
             RNOCPhone:  +1-513-425-5000 
             RNOCEmail:  michelle.collins@clevelandcliffs.com
             RNOCRef:    https://rdap.arin.net/registry/entity/MPC47-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.
             #