Report for 20404

Name

AS20404 - NRG Energy, 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.

20404 AS20404 - NRG Energy, Inc., US

  Adjacency:     2  Upstream:     2  Downstream:     0
  Upstream Adjacent AS list
    AS6461          ZAYO-6461 - Zayo Bandwidth, US
    AS46887         CROWNCASTLE-AS46887 - Crown Castle Fiber LLC, US

Announced Prefixes

Rank  AS       Type    Originate Addr Space  (pfx)   Transit Addr space  (pfx)  Description
23108 AS20404        ORIGIN  Originate:       2304 /20.83  Transit:          0 /0.00  AS20404 - NRG Energy, 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       %
21479 AS20404       AS20404 - NRG Energy, Inc., US                     7      2      1      6      1  14.29%


  Prefix               AS Path                              Aggregation Suggestion
  158.81.153.0/24      4777 2497 6461 20404   
  158.81.160.0/24      4608 7575 1299 46887 20404   
  158.81.168.0/24      4608 7575 1299 46887 20404   
  158.81.208.0/22      4777 2497 6461 20404 + Announce - aggregate of 158.81.208.0/23 (4777 2497 6461 20404) and 158.81.210.0/23 (4777 2497 6461 20404)
  158.81.208.0/23      4777 2497 6461 20404 - Withdrawn - aggregated with 158.81.210.0/23 (4777 2497 6461 20404)
  158.81.210.0/23      4777 2497 6461 20404 - Withdrawn - aggregated with 158.81.208.0/23 (4777 2497 6461 20404)
  158.81.251.0/24      4608 7575 1299 46887 20404   
  158.81.252.0/24      4777 2497 6461 20404   

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

AS20404   7 More Specifics   7 Total Advertisements   AS20404 - NRG Energy, Inc., US
    158.81.153.0/24               158.81.128.0/18
    158.81.160.0/24               158.81.128.0/18
    158.81.168.0/24               158.81.128.0/18
    158.81.208.0/23               158.81.192.0/18
    158.81.210.0/23               158.81.192.0/18
    158.81.251.0/24               158.81.192.0/18
    158.81.252.0/24               158.81.192.0/18

Whois Entry

whois: 402603

IANA has recorded AS20404 as originally allocated by 
/usr/bin/whois -h jwhois.apnic.netr "AS20404\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:       20404
             ASName:         AS20404
             ASHandle:       AS20404
             RegDate:        2001-05-03
             Updated:        2013-03-07
             Ref:            https://rdap.arin.net/registry/autnum/20404
             
             
             OrgName:        NRG Energy, Inc.
             OrgId:          NE-29
             Address:        910 Louisiana Street
             City:           Houston
             StateProv:      TX
             PostalCode:     77002
             Country:        US
             RegDate:        2013-02-22
             Updated:        2022-04-19
             Ref:            https://rdap.arin.net/registry/entity/NE-29
             
             
             OrgNOCHandle: NETWO3117-ARIN
             OrgNOCName:   Network Services
             OrgNOCPhone:  +1-832-357-3000 
             OrgNOCEmail:  Corp_NetOps_DL@nrg.com
             OrgNOCRef:    https://rdap.arin.net/registry/entity/NETWO3117-ARIN
             
             OrgTechHandle: NETWO3117-ARIN
             OrgTechName:   Network Services
             OrgTechPhone:  +1-832-357-3000 
             OrgTechEmail:  Corp_NetOps_DL@nrg.com
             OrgTechRef:    https://rdap.arin.net/registry/entity/NETWO3117-ARIN
             
             OrgAbuseHandle: NETWO3117-ARIN
             OrgAbuseName:   Network Services
             OrgAbusePhone:  +1-832-357-3000 
             OrgAbuseEmail:  Corp_NetOps_DL@nrg.com
             OrgAbuseRef:    https://rdap.arin.net/registry/entity/NETWO3117-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.
             #