Report for 33657

Name

CMCS - Comcast Cable Communications, 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.

33657 CMCS - Comcast Cable Communications, LLC, US

  Adjacency:    81  Upstream:     1  Downstream:    80
  Upstream Adjacent AS list
    AS7922          COMCAST-7922 - Comcast Cable Communications, LLC, US
  Downstream Adjacent AS list
    AS10918         ACCURANT - Accurant Cloud Services LLC, US
    AS11790         RANDOMHOUSE - Random House, Inc., US
    AS12245         PRMC-ASN - Peninsula Regional Medical Center, US
    AS12222         AKAMAI - Akamai Technologies, Inc., US
    AS11951         MCSP - Medical Computer Systems, US
    AS16463         DPSINET - Data Processing Solutions, Inc., US
    AS15134         PWCSA - Prince William County Service Authority, US
    AS14899         MOBILEXUSA - MobilexUSA, US
    AS16881         DAVID-C-PRALL-INTERNET - Prall, Inc., David C, US
    AS14246         THALESCOMMINC-AS - Thales Communications Inc., US
    AS18733         ZENIMAXMEDIA - ZeniMax Media Incorporated, US
    AS17190         ASN17190 - Washington Metropolitan Area Transit Authority, US
    AS17035         NBCUNI-17035 - NBCUniversal, US
    AS19936         GORDONFOODS - Gordon Food Service, US
    AS19320         FLEX-WDF - Flextronics International USA, Inc., US
    AS19316         QUADRANGLE - Quadrangle Development Corporation, US
    AS22101         CPIL-ASN - Cyber Point International, LLC, US
    AS22593         BCBSNC-AS - Blue Cross and Blue Shield of North Carolina, US
    AS21683         DALKO-NETWORKS - Dalko, LLC, US
    AS14036         STACKAV-01 - Stack AV, US
    AS22962         KENNEDY-NW-DC-US - The Kennedy Center, US
    AS25696         -Reserved AS-, ZZ
    AS25716         INGERSOLL-RAND - Trane Technologies Company LLC, US
    AS2384          AOCNET - Architect of the Capitol, US
    AS26868         NCTA-WASHINGTONDC - NCTA - The Internet & Television Association, US
    AS27003         AMERICAN-BANKERS-ASSOCIATION - American Bankers Association, US
    AS2703          -Reserved AS-, ZZ
    AS27336         SENTARA-HEALTH-CARE - Sentara Healthcare, US
    AS26020         STSCI-NET - Space Telescope Science Institute, US
    AS29865         CONTREALTYCORP - Continental Realty Corporation, US
    AS32073         MCPS-K12-MD-US - Montgomery County Public Schools, US
    AS31902         OTS - Open Technology Solutions, LLC, US
    AS30385         PERDUE-FARMS-INCORPORATED - Perdue Farms Incorporated, US
    AS22815         KELLY-INSURANCE-GROUP - Kelly and Associates Insurance Group, US
    AS32837         WCL-50-AS - Williams & Connolly, LLP, US
    AS33170         MORGAN-STATE-UNIVERSITY - Morgan State University, US
    AS33506         CPINETWORKS-AS - COMMPUTERCATIONS, US
    AS32291         ANNEARUNDELMEDICALCENTER - ANNE ARUNDEL MEDICAL CENTER, US
    AS22694         CNBC - NBCUniversal, US
    AS36151         ACUOA-NET - The Alta Condominium Unit Owners Association, US
    AS3705          GPO-NET - U.S. Government Publishing Office, US
    AS394077        LIFEBRIDGEHEALTH - Lifebridge Health, Inc., US
    AS393732        BCS - Bogdan Computer Services Inc., US
    AS393319        ANDURIL-1 - Anduril Industries, Inc., US
    AS395973        GOOGLE-2 - Google LLC, US
    AS395145        MCDONOGH - McDonogh School, Inc., US
    AS36457         DISTR-21 - District Photo, Inc., US
    AS396222        TENABLE-NETWORK-SECURITY-INC - Tenable, Inc., US
    AS397487        RAVENS-ASN - Baltimore Ravens Limited Partnership, US
    AS396017        COMCAST-MES - Comcast Cable Communications, LLC, US
    AS36040         YOUTUBE - Google LLC, US
    AS400678        IPV4 - LIDL US OPERATIONS, LLC, US
    AS400044        AS-CEIWC - Chesapeake Employers Insurance Company, US
    AS33738         UNITED-STATES-HOLOCAUST-MEMORIAL-MUSEUM - United States Holocaust Memorial Museum, US
    AS400902        WASGN - Gaylord National Resort & Convention Center, US
    AS40391         CHSINC - CHS COOPERATIVES FOUNDATION, US
    AS40410         USFRCS-BGP - FRIT, US
    AS40833         NYTD-SEA1 - The New York Times Company, US
    AS40857         PAECOM - IT-CNP, Inc., US
    AS46084         ASRCFH-NET - ASRC FEDERAL HOLDING COMPANY, LLC, US
    AS40954         JMFAMILY - JM Family Enterprises Inc., US
    AS46624         BEEBE-MEDICAL-CENTER - Beebe Medical Center Inc., US
    AS53302         BALTIMORECOUNTYGOVERNMENT - Baltimore County Government, US
    AS53252         PTG-17-ASN - World Wide Technology Holding Co., Inc., US
    AS4880          LIFELINE-ASN - Lifeline Systems, Company, US
    AS46988         MICA-AS - Maryland Institute College of Art, US
    AS46784         DPW - Davis Polk & Wardwell, LLP, US
    AS46200         ITC-146 - IT Curves, US
    AS46187         SPY - International Spy Museum, US
    AS53373         MATH-INC - Mathematica, Inc., US
    AS54849         KANE-IS-ABLE - Kane Warehousing, Inc, US
    AS5721          NDU-NET - National Defense University, US
    AS572           GBMC-TOW - Greater Baltimore Medical Center Inc, US
    AS62957         HOSPITALITY-NETWORK - HOSPITALITY NETWORK, LLC, US
    AS63336         ADVENTIST-HEALTHCARE-MARYLAND - Adventist Healthcare, US
    AS53862         MCDANIELCOLLEGE - McDaniel College, US
    AS53350         EMBHUN-WAS-01 - Embassy of Hungary, US
    AS401366        VOX-FLOW - Vox Flow LLC, US
    AS400732        RIVERNET - RiverNet, LLC, US
    AS22602         EXPERIENT-INC - Experient Inc., US

Announced Prefixes

Rank  AS       Type    Originate Addr Space  (pfx)   Transit Addr space  (pfx)  Description
9409  AS33657        ORG+TRN Originate:      12032 /18.45  Transit:     190720 /14.46 CMCS - Comcast Cable Communications, 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       %
22454 AS33657       CMCS - Comcast Cable Communications, LLC, US      31      2      1     30      1   3.23%


  Prefix               AS Path                              Aggregation Suggestion
  50.201.252.0/24      4777 2516 7922 33657   
  50.202.12.0/24       4777 2516 7922 33657   
  50.202.117.0/24      4777 2516 7922 33657   
  50.202.155.0/24      4777 2516 7922 33657   
  50.203.251.0/24      4777 2516 7922 33657   
  50.204.116.0/24      4777 2516 7922 33657   
  50.204.128.0/24      4777 2516 7922 33657   
  50.205.74.0/24       4777 2516 7922 33657   
  50.207.162.0/24      4777 2516 7922 33657   
  50.216.214.0/24      4777 2516 7922 33657   
  50.219.87.0/24       4777 2516 7922 33657   
  50.223.158.0/23      4777 2516 7922 33657 + Announce - aggregate of 50.223.158.0/24 (4777 2516 7922 33657) and 50.223.159.0/24 (4777 2516 7922 33657)
  50.223.158.0/24      4777 2516 7922 33657 - Withdrawn - aggregated with 50.223.159.0/24 (4777 2516 7922 33657)
  50.223.159.0/24      4777 2516 7922 33657 - Withdrawn - aggregated with 50.223.158.0/24 (4777 2516 7922 33657)
  50.224.212.0/24      4777 2516 7922 33657   
  50.232.109.0/24      4777 2516 7922 33657   
  50.232.173.0/24      4777 2516 7922 33657   
  50.232.184.0/24      4777 2516 7922 33657   
  50.235.98.0/24       4777 2516 7922 33657   
  50.235.236.0/24      4777 2516 7922 33657   
  50.236.38.0/24       4777 2516 7922 33657   
  50.236.234.0/24      4777 2516 7922 33657   
  50.238.112.0/24      4777 2516 7922 33657   
  50.238.163.0/24      4777 2516 7922 33657   
  50.239.232.0/24      4777 2516 7922 33657   
  69.67.80.0/20        4777 2516 7922 33657   
  76.78.2.0/24         4777 2516 7922 33657   
  107.1.101.0/24       4777 2516 7922 33657   
  192.110.220.0/23     4777 2516 7922 33657   
  192.189.235.0/24     4777 2516 7922 33657   
  199.249.199.0/24     4777 2516 7922 33657   
  208.87.105.0/24      4777 2516 7922 33657   

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

AS33657   27 More Specifics   31 Total Advertisements   CMCS - Comcast Cable Communications, LLC, US
    50.201.252.0/24               50.128.0.0/9
    50.202.12.0/24                50.128.0.0/9
    50.202.117.0/24               50.128.0.0/9
    50.202.155.0/24               50.128.0.0/9
    50.203.251.0/24               50.128.0.0/9
    50.204.116.0/24               50.128.0.0/9
    50.204.128.0/24               50.128.0.0/9
    50.205.74.0/24                50.128.0.0/9
    50.207.162.0/24               50.128.0.0/9
    50.216.214.0/24               50.128.0.0/9
    50.219.87.0/24                50.128.0.0/9
    50.223.158.0/24               50.128.0.0/9
    50.223.159.0/24               50.128.0.0/9
    50.224.212.0/24               50.128.0.0/9
    50.232.109.0/24               50.128.0.0/9
    50.232.173.0/24               50.128.0.0/9
    50.232.184.0/24               50.128.0.0/9
    50.235.98.0/24                50.128.0.0/9
    50.235.236.0/24               50.128.0.0/9
    50.236.38.0/24                50.128.0.0/9
    50.236.234.0/24               50.128.0.0/9
    50.238.112.0/24               50.128.0.0/9
    50.238.163.0/24               50.128.0.0/9
    50.239.232.0/24               50.128.0.0/9
    76.78.2.0/24                  76.78.0.0/16
    107.1.101.0/24                107.0.0.0/14
    208.87.105.0/24               208.87.104.0/22

Prefixes added and withdrawn by this origin AS in the past 7 days.

    + 50.202.12.0/24              Announced

Bogus ASes Announced by this AS

Bogus AS		Announcing-AS
AS2703	Announced by	AS33657	CMCS - Comcast Cable Communications, LLC, US
AS25696	Announced by	AS33657	CMCS - Comcast Cable Communications, LLC, US

Whois Entry

whois: 402332

IANA has recorded AS33657 as originally allocated by 
/usr/bin/whois -h jwhois.apnic.netr "AS33657\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:       33657
             ASName:         CMCS
             ASHandle:       AS33657
             RegDate:        2005-02-16
             Updated:        2021-01-25
             Ref:            https://rdap.arin.net/registry/autnum/33657
             
             
             
             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
             
             
             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
             
             OrgRoutingHandle: ROUTI25-ARIN
             OrgRoutingName:   Routing
             OrgRoutingPhone:  +1-856-792-2300 
             OrgRoutingEmail:  routing@comcast.com
             OrgRoutingRef:    https://rdap.arin.net/registry/entity/ROUTI25-ARIN
             
             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
             
             
             #
             # 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.
             #