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 AS6447) 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, US

  Adjacency:   120  Upstream:     2  Downstream:   118
  Upstream Adjacent AS list
    AS3356          LEVEL3, US
    AS7922          COMCAST-7922, US
  Downstream Adjacent AS list
    AS27003         AMERICAN-BANKERS-ASSOCIATION, US
    AS13628         CENCORA-INTERNET, US
    AS10440         MERKLE-INC, US
    AS14384         HOSTDESIGNS, US
    AS14862         OCEANEERING, US
    AS14473         I3ASN1-200E, US
    AS18967         AMAXX, US
    AS19574         CSC, US
    AS19320         FLEX-WDF, US
    AS21963         AS-AGENCYINSURANCEMD-0001, US
    AS22596         CHR-823, US
    AS14036         STACKAV-01, US
    AS25984         MEDSTARHEALTH, US
    AS27026         NETWORKMARYLAND, US
    AS32837         WCL-50-AS, US
    AS36486         AMTOTE-AS, US
    AS393330        IRI-BGP, US
    AS393997        REDCOATS, US
    AS393706        NELSONCABLE, US
    AS394024        ASHA-HQ, US
    AS393432        NHS14MH, US
    AS396514        CI-AS, US
    AS397154        NUCLEUS-CENTRAL-ATL, US
    AS396322        PC-ASN, US
    AS395009        VECTORWORKS-NET, US
    AS398820        EA-ASN-01, US
    AS40833         NYTD-SEA1, US
    AS401366        VOX-FLOW, US
    AS53302         BALTIMORECOUNTYGOVERNMENT, US
    AS4977          VENCORESS, US
    AS7820          TOWERFCU-AS, US
    AS397934        AAILLC-1, US
    AS22613         -Reserved AS-, ZZ
    AS11362         VECTOR, US
    AS13582         COWAN-ASN, US
    AS16505         HTF-FREDERICK, US
    AS16409         PBW-COMMUNICATIONS, US
    AS398322        ESFCU-01, US
    AS13511         UNIVI-2-ASN, US
    AS12245         PRMC-ASN, US
    AS30641         STATEOFDE, US
    AS3705          GPO-NET, US
    AS395145        MCDONOGH, US
    AS394984        FDBL-NETWORK, US
    AS396848        DEC-139, US
    AS400467        IRONBOWLAB-ASN, US
    AS46084         ASRCFH-NET, US
    AS46624         BEEBE-MEDICAL-CENTER, US
    AS46988         MICA-AS, US
    AS42228         BRIGHTSTAR Brightstar AS object, GB
    AS10918         SITELOCK, US
    AS11790         RANDOMHOUSE, US
    AS1358          HNSNET-AS, US
    AS12222         AKAMAI, US
    AS11951         MCSP, US
    AS16463         DPSINET, US
    AS15134         PWCSA, US
    AS16881         PRALL-DAVID-C-INTERNET, US
    AS14246         THALESCOMMINC-AS, US
    AS18733         ZENIMAXMEDIA, US
    AS17190         ASN17190, US
    AS17035         NBCUNI-17035, US
    AS19936         GORDONFOODS, US
    AS20137         USAGM-LAN, US
    AS19316         QUADRANGLE, US
    AS22101         CPIL-ASN, US
    AS22593         BCBSNC-AS, US
    AS21683         DALKO-NETWORKS, US
    AS22962         KENNEDY-NW-DC-, US
    AS25696         PDP-GROUP-INC, US
    AS25716         INGERSOLL-RAND, US
    AS2384          AOCNET, US
    AS26020         STSCI-NET, US
    AS22815         KELLY-INSURANCE-GROUP, US
    AS26868         NCTA-WASHINGTONDC, US
    AS2703          DATAPR-3, US
    AS27336         SENTARA-HEALTH-CARE, US
    AS27016         NRC-NET, US
    AS29865         CONTREALTYCORP, US
    AS32073         MCPS-K12-MD-, US
    AS31902         OTS, US
    AS30385         PERDUE-FARMS-INCORPORATED, US
    AS26522         SU-ASN-1, US
    AS33170         MORGAN-STATE-UNIVERSITY, US
    AS33506         CPINETWORKS-AS, US
    AS32291         ANNEARUNDELMEDICALCENTER, US
    AS22694         -Reserved AS-, ZZ
    AS36151         ACUOA-NET, US
    AS394077        LIFEBRIDGEHEALTH, US
    AS395973        GOOGLE-2, US
    AS393319        ANDURIL-1, US
    AS36457         DISTR-21, US
    AS396222        TENABLE-NETWORK-SECURITY-INC, US
    AS397487        RAVENS-ASN, US
    AS396017        COMCAST-MES, US
    AS36040         YOUTUBE, US
    AS400678        IPV4, US
    AS400044        --No Registry Entry--
    AS40391         CHSINC, US
    AS40410         USFRCS-BGP, US
    AS40857         PAECOM, US
    AS40954         JMFAMILY, US
    AS53252         PTG-17-ASN, US
    AS4880          LIFELINE-ASN, US
    AS46784         DPW, US
    AS46200         ITC-146, US
    AS46187         SPY, US
    AS53373         MATH-INC, US
    AS54849         KANE-IS-ABLE, US
    AS5721          NDU-NET, US
    AS572           GBMC-TOW, US
    AS62957         HOSPITALITY-NETWORK, US
    AS63336         ADVENTIST-HEALTHCARE-MARYLAND, US
    AS53862         MCDANIELCOLLEGE, US
    AS53350         EMBHUN-WAS-01, US
    AS400902        WASGN, US
    AS33738         UNITED-STATES-HOLOCAUST-MEMORIAL-MUSEUM, US
    AS22602         EXPERIENT-INC, US

Announced Prefixes

Rank  AS       Type    Originate Addr Space  (pfx)   Transit Addr space  (pfx)  Description
9501  AS33657        ORG+TRN Originate:      11776 /18.48  Transit:     180736 /14.54 CMCS, 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       %
22293 AS33657       CMCS, US                                          30      2      1     29      1   3.33%


  Prefix               AS Path                              Aggregation Suggestion
  50.201.252.0/24      3257 7922 33657        
  50.202.117.0/24      3257 7922 33657        
  50.202.155.0/24      3257 7922 33657        
  50.203.251.0/24      3257 7922 33657        
  50.204.116.0/24      3257 7922 33657        
  50.204.128.0/24      3257 7922 33657        
  50.205.74.0/24       3257 7922 33657        
  50.207.162.0/24      6939 7922 33657        
  50.216.214.0/24      3257 7922 33657        
  50.219.87.0/24       6939 7922 33657        
  50.223.158.0/23      3257 7922 33657      + Announce - aggregate of 50.223.158.0/24 (3257 7922 33657) and 50.223.159.0/24 (3257 7922 33657)
  50.223.158.0/24      3257 7922 33657      - Withdrawn - aggregated with 50.223.159.0/24 (3257 7922 33657)
  50.223.159.0/24      3257 7922 33657      - Withdrawn - aggregated with 50.223.158.0/24 (3257 7922 33657)
  50.224.212.0/24      3257 7922 33657        
  50.232.109.0/24      3257 7922 33657        
  50.232.173.0/24      2914 7922 33657        
  50.232.184.0/24      3257 7922 33657        
  50.235.98.0/24       3257 7922 33657        
  50.235.236.0/24      3257 7922 33657        
  50.236.38.0/24       3257 7922 33657        
  50.236.234.0/24      3257 7922 33657        
  50.238.112.0/24      6939 7922 33657        
  50.238.163.0/24      3257 7922 33657        
  50.239.232.0/24      3257 7922 33657        
  69.67.80.0/20        57866 3356 33657       
  76.78.2.0/24         57866 3356 33657       
  107.1.101.0/24       3257 7922 33657        
  192.110.220.0/23     57866 3356 33657       
  192.189.235.0/24     57866 3356 33657       
  199.249.199.0/24     6939 7922 33657        
  208.87.105.0/24      57866 3356 33657       

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

AS33657   51 More Specifics   60 Total Advertisements   CMCS, US
    23.34.0.0/22                  23.32.0.0/11
    23.64.64.0/19                 23.64.0.0/14
    23.211.124.0/24               23.192.0.0/11
    23.211.125.0/24               23.192.0.0/11
    50.169.18.0/24                50.128.0.0/9
    50.169.21.0/24                50.128.0.0/9
    50.200.127.0/24               50.128.0.0/9
    50.201.252.0/24               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
    50.202.217.0/24               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
    50.205.18.0/24                50.128.0.0/9
    50.205.74.0/24                50.128.0.0/9
    50.206.150.0/24               50.128.0.0/9
    50.206.248.0/24               50.128.0.0/9
    50.207.101.0/24               50.128.0.0/9
    50.207.111.0/24               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
    50.217.23.0/24                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
    50.232.190.0/24               50.128.0.0/9
    50.233.122.0/24               50.128.0.0/9
    50.235.98.0/24                50.128.0.0/9
    50.235.212.0/24               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
    50.238.112.0/24               50.128.0.0/9
    50.238.163.0/24               50.128.0.0/9
    50.239.85.0/24                50.128.0.0/9
    50.239.232.0/24               50.128.0.0/9
    74.116.62.0/24                74.116.60.0/22
    74.116.63.0/24                74.116.60.0/22
    74.122.56.0/22                74.122.56.0/21
    74.122.60.0/22                74.122.56.0/21
    107.1.101.0/24                107.0.0.0/14
    107.180.128.0/22              107.180.128.0/18
    107.180.132.0/22              107.180.128.0/18
    204.106.30.0/24               204.106.24.0/21
    206.251.196.0/22              206.251.192.0/20
    206.251.200.0/22              206.251.192.0/20
    208.39.143.0/24               208.39.128.0/18
    50.169.98.0/24                50.128.0.0/9
    50.236.234.0/24               50.128.0.0/9

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

    + 50.200.127.0/24             Announced
    + 50.232.190.0/24             Announced
    + 50.233.122.0/24             Announced
    + 50.235.212.0/24             Announced
    + 192.111.218.0/24            Announced
    + 192.126.96.0/20             Announced
    + 204.106.30.0/24             Announced
    + 206.251.196.0/22            Announced
    + 206.251.200.0/22            Announced
    + 208.39.143.0/24             Announced
    - 50.169.98.0/24              Withdrawn
    - 50.236.234.0/24             Withdrawn

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: 402603

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.
             #