Report for 10953

Name

CEG - CONSTELLATION ENERGY GENERATION, 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.

10953 CEG - CONSTELLATION ENERGY GENERATION, LLC, US

  Adjacency:     2  Upstream:     2  Downstream:     0
  Upstream Adjacent AS list
    AS3356          LEVEL3 - Level 3 Parent, LLC, US
    AS1321          ANSBB-ASNNET-1 - Verizon Business, US

Announced Prefixes

Rank  AS       Type    Originate Addr Space  (pfx)   Transit Addr space  (pfx)  Description
11508 AS10953        ORIGIN  Originate:       8192 /19.00  Transit:          0 /0.00  CEG - CONSTELLATION ENERGY GENERATION, 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       %
 2658 AS10953       CEG - CONSTELLATION ENERGY GENERATION, LLC, U     32     28      8     12     20  62.50%


  Prefix               AS Path                              Aggregation Suggestion
  159.214.192.0/21     4777 2516 3356 10953 + Announce - aggregate of 159.214.192.0/22 (4777 2516 3356 10953) and 159.214.196.0/22 (4777 2516 3356 10953)
  159.214.192.0/24     4777 2516 3356 10953 - Withdrawn - aggregated with 159.214.193.0/24 (4777 2516 3356 10953)
  159.214.193.0/24     4777 2516 3356 10953 - Withdrawn - aggregated with 159.214.192.0/24 (4777 2516 3356 10953)
  159.214.194.0/24     4777 2516 3356 10953 - Withdrawn - aggregated with 159.214.195.0/24 (4777 2516 3356 10953)
  159.214.195.0/24     4777 2516 3356 10953 - Withdrawn - aggregated with 159.214.194.0/24 (4777 2516 3356 10953)
  159.214.196.0/24     4777 2516 3356 10953 - Withdrawn - aggregated with 159.214.197.0/24 (4777 2516 3356 10953)
  159.214.197.0/24     4777 2516 3356 10953 - Withdrawn - aggregated with 159.214.196.0/24 (4777 2516 3356 10953)
  159.214.198.0/24     4777 2516 3356 10953 - Withdrawn - aggregated with 159.214.199.0/24 (4777 2516 3356 10953)
  159.214.199.0/24     4777 2516 3356 10953 - Withdrawn - aggregated with 159.214.198.0/24 (4777 2516 3356 10953)
  159.214.200.0/24     4777 2516 3356 10953   
  159.214.201.0/24     4777 2516 701 1321 10953   
  159.214.202.0/23     4777 2516 701 1321 10953 + Announce - aggregate of 159.214.202.0/24 (4777 2516 701 1321 10953) and 159.214.203.0/24 (4777 2516 701 1321 10953)
  159.214.202.0/24     4777 2516 701 1321 10953 - Withdrawn - aggregated with 159.214.203.0/24 (4777 2516 701 1321 10953)
  159.214.203.0/24     4777 2516 701 1321 10953 - Withdrawn - aggregated with 159.214.202.0/24 (4777 2516 701 1321 10953)
  159.214.204.0/22     4777 2516 701 1321 10953 + Announce - aggregate of 159.214.204.0/23 (4777 2516 701 1321 10953) and 159.214.206.0/23 (4777 2516 701 1321 10953)
  159.214.204.0/24     4777 2516 701 1321 10953 - Withdrawn - aggregated with 159.214.205.0/24 (4777 2516 701 1321 10953)
  159.214.205.0/24     4777 2516 701 1321 10953 - Withdrawn - aggregated with 159.214.204.0/24 (4777 2516 701 1321 10953)
  159.214.206.0/24     4777 2516 701 1321 10953 - Withdrawn - aggregated with 159.214.207.0/24 (4777 2516 701 1321 10953)
  159.214.207.0/24     4777 2516 701 1321 10953 - Withdrawn - aggregated with 159.214.206.0/24 (4777 2516 701 1321 10953)
  159.214.208.0/24     4777 2516 701 1321 10953   
  159.214.209.0/24     4777 2516 3356 10953   
  159.214.210.0/23     4777 2516 3356 10953 + Announce - aggregate of 159.214.210.0/24 (4777 2516 3356 10953) and 159.214.211.0/24 (4777 2516 3356 10953)
  159.214.210.0/24     4777 2516 3356 10953 - Withdrawn - aggregated with 159.214.211.0/24 (4777 2516 3356 10953)
  159.214.211.0/24     4777 2516 3356 10953 - Withdrawn - aggregated with 159.214.210.0/24 (4777 2516 3356 10953)
  159.214.212.0/22     4777 2516 3356 10953 + Announce - aggregate of 159.214.212.0/23 (4777 2516 3356 10953) and 159.214.214.0/23 (4777 2516 3356 10953)
  159.214.212.0/24     4777 2516 3356 10953 - Withdrawn - aggregated with 159.214.213.0/24 (4777 2516 3356 10953)
  159.214.213.0/24     4777 2516 3356 10953 - Withdrawn - aggregated with 159.214.212.0/24 (4777 2516 3356 10953)
  159.214.214.0/24     4777 2516 3356 10953 - Withdrawn - aggregated with 159.214.215.0/24 (4777 2516 3356 10953)
  159.214.215.0/24     4777 2516 3356 10953 - Withdrawn - aggregated with 159.214.214.0/24 (4777 2516 3356 10953)
  159.214.216.0/23     4777 2516 3356 10953 + Announce - aggregate of 159.214.216.0/24 (4777 2516 3356 10953) and 159.214.217.0/24 (4777 2516 3356 10953)
  159.214.216.0/24     4777 2516 3356 10953 - Withdrawn - aggregated with 159.214.217.0/24 (4777 2516 3356 10953)
  159.214.217.0/24     4777 2516 3356 10953 - Withdrawn - aggregated with 159.214.216.0/24 (4777 2516 3356 10953)
  159.214.218.0/23     4777 2516 701 1321 10953 + Announce - aggregate of 159.214.218.0/24 (4777 2516 701 1321 10953) and 159.214.219.0/24 (4777 2516 701 1321 10953)
  159.214.218.0/24     4777 2516 701 1321 10953 - Withdrawn - aggregated with 159.214.219.0/24 (4777 2516 701 1321 10953)
  159.214.219.0/24     4777 2516 701 1321 10953 - Withdrawn - aggregated with 159.214.218.0/24 (4777 2516 701 1321 10953)
  159.214.220.0/22     4777 2516 701 1321 10953 + Announce - aggregate of 159.214.220.0/23 (4777 2516 701 1321 10953) and 159.214.222.0/23 (4777 2516 701 1321 10953)
  159.214.220.0/24     4777 2516 701 1321 10953 - Withdrawn - aggregated with 159.214.221.0/24 (4777 2516 701 1321 10953)
  159.214.221.0/24     4777 2516 701 1321 10953 - Withdrawn - aggregated with 159.214.220.0/24 (4777 2516 701 1321 10953)
  159.214.222.0/24     4777 2516 701 1321 10953 - Withdrawn - aggregated with 159.214.223.0/24 (4777 2516 701 1321 10953)
  159.214.223.0/24     4777 2516 701 1321 10953 - Withdrawn - aggregated with 159.214.222.0/24 (4777 2516 701 1321 10953)

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

AS10953   32 More Specifics   32 Total Advertisements   CEG - CONSTELLATION ENERGY GENERATION, LLC, US
    159.214.192.0/24              159.214.192.0/18
    159.214.193.0/24              159.214.192.0/18
    159.214.194.0/24              159.214.192.0/18
    159.214.195.0/24              159.214.192.0/18
    159.214.196.0/24              159.214.192.0/18
    159.214.197.0/24              159.214.192.0/18
    159.214.198.0/24              159.214.192.0/18
    159.214.199.0/24              159.214.192.0/18
    159.214.200.0/24              159.214.192.0/18
    159.214.201.0/24              159.214.192.0/18
    159.214.202.0/24              159.214.192.0/18
    159.214.203.0/24              159.214.192.0/18
    159.214.204.0/24              159.214.192.0/18
    159.214.205.0/24              159.214.192.0/18
    159.214.206.0/24              159.214.192.0/18
    159.214.207.0/24              159.214.192.0/18
    159.214.208.0/24              159.214.192.0/18
    159.214.209.0/24              159.214.192.0/18
    159.214.210.0/24              159.214.192.0/18
    159.214.211.0/24              159.214.192.0/18
    159.214.212.0/24              159.214.192.0/18
    159.214.213.0/24              159.214.192.0/18
    159.214.214.0/24              159.214.192.0/18
    159.214.215.0/24              159.214.192.0/18
    159.214.216.0/24              159.214.192.0/18
    159.214.217.0/24              159.214.192.0/18
    159.214.218.0/24              159.214.192.0/18
    159.214.219.0/24              159.214.192.0/18
    159.214.220.0/24              159.214.192.0/18
    159.214.221.0/24              159.214.192.0/18
    159.214.222.0/24              159.214.192.0/18
    159.214.223.0/24              159.214.192.0/18

Whois Entry

whois: 402332

IANA has recorded AS10953 as originally allocated by 
/usr/bin/whois -h jwhois.apnic.netr "AS10953\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:       10953
             ASName:         CEG
             ASHandle:       AS10953
             RegDate:        1998-02-10
             Updated:        2024-01-11
             Ref:            https://rdap.arin.net/registry/autnum/10953
             
             
             OrgName:        CONSTELLATION ENERGY GENERATION, LLC
             OrgId:          CEG-74
             Address:        1310 Point Street
             Address:        16th Floor
             City:           Baltimore
             StateProv:      MD
             PostalCode:     21231
             Country:        US
             RegDate:        2023-08-17
             Updated:        2023-09-19
             Ref:            https://rdap.arin.net/registry/entity/CEG-74
             
             
             OrgAbuseHandle: CEGNO-ARIN
             OrgAbuseName:   CEG NOC
             OrgAbusePhone:  +1-844-523-4486 
             OrgAbuseEmail:  noc@constellation.com
             OrgAbuseRef:    https://rdap.arin.net/registry/entity/CEGNO-ARIN
             
             OrgTechHandle: CEGNO-ARIN
             OrgTechName:   CEG NOC
             OrgTechPhone:  +1-844-523-4486 
             OrgTechEmail:  noc@constellation.com
             OrgTechRef:    https://rdap.arin.net/registry/entity/CEGNO-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.
             #