Report for 21508

Name

COMCAST-21508, 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.

21508 COMCAST-21508, US

  Adjacency:    44  Upstream:     1  Downstream:    43
  Upstream Adjacent AS list
    AS7922          COMCAST-7922, US
  Downstream Adjacent AS list
    AS11739         CHIRISA-TECHNOLOGY-PARK-01, US
    AS11679         STIHL-204-124-67, US
    AS14583         VITA-VSP-1, US
    AS13952         NCI-58-13952, US
    AS15297         EPLUS-ASN, US
    AS15173         NEWMA-11, US
    AS19923         SHENANDOAH-UNIV, US
    AS2134          GSVNET-AS GS Virtual Network Produban, ES
    AS21863         INTELIVANT-CONSULTING, US
    AS23209         VHDA20011260123220, US
    AS27336         SENTARA-HEALTH-CARE, US
    AS22274         SMP-VIR, US
    AS17381         AS-WSI-ECOM-WEST, US
    AS33265         LEEBHMG-ASN-33265, US
    AS32540         HP-HOOD, US
    AS393613        VACU-ASN-1, US
    AS394058        TELOSC-ASH, US
    AS36364         MHSNET, US
    AS36244         SVEC, US
    AS33296         PIEDMONT-BROADBAND, US
    AS395772        AHC-AS, US
    AS396083        ARVUS-160-84, US
    AS395527        -Reserved AS-, ZZ
    AS399232        SETON-HOME, US
    AS399099        PCPS-ASN, US
    AS397039        WORLDSTRIDES, US
    AS40288         CFCU-AS, US
    AS400114        APOG-RBC, US
    AS396452        LOUDOUN-WATER, US
    AS40400         EDC-MIDDLETOWN, US
    AS40323         VAFB, US
    AS395505        IMANAGE, US
    AS46643         VIRGINIA-COLLEGE-SAVINGS-PLAN, US
    AS40641         MGWTEL, US
    AS40485         SSB, US
    AS54391         CRUTCHFIELD, US
    AS54219         SCHAWK-INC, US
    AS62971         COUNTY-OF-CHESTERFIELD-VA, US
    AS63468         INFINITTNA, US
    AS54883         CORVA, US
    AS46847         NEXVORTEX, US
    AS30299         THE-MARTIN-AGENCY-HQ, US
    AS13335         CLOUDFLARENET, US

Announced Prefixes

Rank  AS       Type    Originate Addr Space  (pfx)   Transit Addr space  (pfx)  Description
2926  AS21508        ORG+TRN Originate:      73728 /15.83  Transit:      79360 /15.72 COMCAST-21508, US

Aggregation Suggestions

        Filter: Aggregates, Specifics

 Rank AS            AS Name                                      Current  Wthdw  Aggte  Annce Redctn       %
21162 AS21508       COMCAST-21508, US                                 27      2      1     26      1   3.70%


  Prefix               AS Path                              Aggregation Suggestion
  50.204.101.0/24      4777 2516 7922 21508   
  50.205.217.0/24      4777 2516 7922 21508   
  50.216.229.0/24      4777 2516 7922 21508   
  50.217.1.0/24        4777 2516 7922 21508   
  50.217.207.0/24      4777 2516 7922 21508   
  50.218.47.0/24       4777 2516 7922 21508   
  50.219.12.0/22       4777 2516 7922 21508   
  50.219.222.0/24      4777 2516 7922 21508   
  50.219.229.0/24      4777 2516 7922 21508   
  50.219.238.0/24      4777 2516 7922 21508   
  50.219.240.0/24      4777 2516 7922 21508   
  50.220.111.0/24      4777 2516 7922 21508   
  50.227.24.0/24       4777 2516 7922 21508   
  50.228.113.0/24      4777 2516 7922 21508   
  50.229.113.0/24      4777 2516 7922 21508   
  50.229.114.0/24      4777 2516 7922 21508   
  50.229.232.0/23      4777 2516 7922 21508 + Announce - aggregate of 50.229.232.0/24 (4777 2516 7922 21508) and 50.229.233.0/24 (4777 2516 7922 21508)
  50.229.232.0/24      4777 2516 7922 21508 - Withdrawn - aggregated with 50.229.233.0/24 (4777 2516 7922 21508)
  50.229.233.0/24      4777 2516 7922 21508 - Withdrawn - aggregated with 50.229.232.0/24 (4777 2516 7922 21508)
  50.235.34.0/24       4777 2516 7922 21508   
  141.104.0.0/16       4777 2516 7922 21508   
  157.240.147.0/24     4777 2516 7922 21508   
  157.240.148.0/24     4777 2516 7922 21508   
  173.242.174.0/24     4777 2516 7922 21508   
  192.100.76.0/24      4777 2516 7922 21508   
  198.90.112.0/22      4777 2516 7922 21508   
  204.194.47.0/24      4777 2516 7922 21508   
  205.223.19.0/24      4777 2516 7922 21508   

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

AS21508   25 More Specifics   27 Total Advertisements   COMCAST-21508, US
    50.204.101.0/24               50.128.0.0/9
    50.205.217.0/24               50.128.0.0/9
    50.216.229.0/24               50.128.0.0/9
    50.217.1.0/24                 50.128.0.0/9
    50.217.207.0/24               50.128.0.0/9
    50.218.47.0/24                50.128.0.0/9
    50.219.12.0/22                50.128.0.0/9
    50.219.222.0/24               50.128.0.0/9
    50.219.229.0/24               50.128.0.0/9
    50.219.238.0/24               50.128.0.0/9
    50.219.240.0/24               50.128.0.0/9
    50.220.111.0/24               50.128.0.0/9
    50.227.24.0/24                50.128.0.0/9
    50.228.113.0/24               50.128.0.0/9
    50.229.113.0/24               50.128.0.0/9
    50.229.114.0/24               50.128.0.0/9
    50.229.232.0/24               50.128.0.0/9
    50.229.233.0/24               50.128.0.0/9
    50.235.34.0/24                50.128.0.0/9
    157.240.147.0/24              157.240.0.0/16
    157.240.148.0/24              157.240.0.0/16
    173.242.174.0/24              173.242.160.0/20
    198.90.112.0/22               198.90.96.0/19
    204.194.47.0/24               204.194.40.0/21
    205.223.19.0/24               205.223.16.0/20

Bogus ASes Announced by this AS

Bogus AS		Announcing-AS
AS395527	Announced by	AS21508	COMCAST-21508, US

Whois Entry

whois: 401308

IANA has recorded AS21508 as originally allocated by 
/usr/bin/whois -h jwhois.apnic.netr "AS21508\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 1997-2024, American Registry for Internet Numbers, Ltd.
             #
             
             
             ASNumber:       21508
             ASName:         COMCAST-21508
             ASHandle:       AS21508
             RegDate:        2001-05-16
             Updated:        2021-01-25    
             Ref:            https://rdap.arin.net/registry/autnum/21508
             
             
             
             OrgName:        Comcast Cable Communications, LLC
             OrgId:          CCCS
             Address:        1800 Bishops Gate Blvd
             City:           Mt Laurel
             StateProv:      NJ
             PostalCode:     08054
             Country:        US
             RegDate:        2001-09-18
             Updated:        2020-11-18
             Ref:            https://rdap.arin.net/registry/entity/CCCS
             
             
             OrgAbuseHandle: NAPO-ARIN
             OrgAbuseName:   Network Abuse and Policy Observance
             OrgAbusePhone:  +1-888-565-4329 
             OrgAbuseEmail:  abuse@comcast.net
             OrgAbuseRef:    https://rdap.arin.net/registry/entity/NAPO-ARIN
             
             OrgRoutingHandle: ROUTI25-ARIN
             OrgRoutingName:   Routing
             OrgRoutingPhone:  +1-856-792-2300 
             OrgRoutingEmail:  routing@comcast.com
             OrgRoutingRef:    https://rdap.arin.net/registry/entity/ROUTI25-ARIN
             
             OrgTechHandle: IC161-ARIN
             OrgTechName:   Comcast Cable Communications Inc
             OrgTechPhone:  +1-856-792-2300 
             OrgTechEmail:  CNIPEO-Ip-registration@cable.comcast.com
             OrgTechRef:    https://rdap.arin.net/registry/entity/IC161-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 1997-2024, American Registry for Internet Numbers, Ltd.
             #