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AS21508

Comcast Cable Communications, LLC

ARIN US active Announced
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Organization
Comcast Cable Communications, LLC
COMCAST-21508
Registered
May 16, 2001
25 years ago
IPv4 Prefixes
17
70,400 addresses
IPv6 Prefixes
61
61 × /48
BGP Neighbours
52
1 upstream/peer · 51 downstream

Registration

AS Number AS21508 AS Name COMCAST-21508 Organization Comcast Cable Communications, LLC Organization ID CCCS Address 1800 Bishops Gate Blvd, Mt Laurel, NJ, 08054, United States Country United States (US) Registry ARIN Allocated May 16, 2001 Record Created May 16, 2001 Last Updated Jan 25, 2021 Status
active
WHOIS Server whois.arin.net AS Description COMCAST-21508 - Comcast Cable Communications, LLC, US Abuse Email [email protected] Abuse Phone +1-888-565-4329

IPv4 Prefixes

17 prefixes · 70,400 addresses Routing data as of 2026-10-06 16:00 UTC

PrefixRangeAddresses
50.204.101.0/2450.204.101.0 – 50.204.101.255256
50.205.217.0/2450.205.217.0 – 50.205.217.255256
50.216.229.0/2450.216.229.0 – 50.216.229.255256
50.217.1.0/2450.217.1.0 – 50.217.1.255256
50.217.207.0/2450.217.207.0 – 50.217.207.255256
50.218.47.0/2450.218.47.0 – 50.218.47.255256
50.228.113.0/2450.228.113.0 – 50.228.113.255256
50.229.113.0/2450.229.113.0 – 50.229.113.255256
50.229.114.0/2450.229.114.0 – 50.229.114.255256
50.235.34.0/2450.235.34.0 – 50.235.34.255256
141.104.0.0/16141.104.0.0 – 141.104.255.25565,536
157.240.147.0/24157.240.147.0 – 157.240.147.255256
157.240.148.0/24157.240.148.0 – 157.240.148.255256
173.242.174.0/24173.242.174.0 – 173.242.174.255256
198.90.112.0/22198.90.112.0 – 198.90.115.2551,024
204.194.47.0/24204.194.47.0 – 204.194.47.255256
205.223.19.0/24205.223.19.0 – 205.223.19.255256

BGP Neighbours

52 unique neighbours · 1 upstream/peer · 51 downstream. A neighbour can be seen on more than one side. Rows are ordered by AS paths: the number of BGP paths seen by RIPE RIS that contain the adjacency. Sightings count each IPv4/IPv6 route with the adjacency once per RIS peer that sees it (routes × peers), so they show how widely it is seen, not how many distinct routes it carries.

Upstream & peer side (1)

Networks seen to the left of this AS in BGP paths, toward the route collectors — typically its transit providers (upstreams) and peers.

ASNameAS pathsIPv4 sightingsIPv6 sightings
AS7922COMCAST-7922 - Comcast Cable Communications, LLC6,84717,68821,135

Downstream side (51)

Networks seen to the right of this AS in BGP paths — networks whose routes it carries, typically its customers (downstreams).

ASNameAS pathsIPv4 sightingsIPv6 sightings
AS13335CLOUDFLARENET - Cloudflare, Inc.506333331
AS54113FASTLY - Fastly, Inc.353332330
AS400114APOG-RBC - Apogee Telecom Inc.2816630
AS396083ARVUS-160-84 - Framatome Inc.2736620
AS36364MHSNET - Mary Washington Hospital, Inc.2703410
AS402549TERRASERVERS-NET - Terraservers2633320
AS54219SCHAWK-INC - Matthews International Corporation2613320
AS399099PCPS-ASN - petersburg city public schools2613310
AS15297EPLUS-ASN - EPLUS, Inc.2609930
AS36040YOUTUBE - Google LLC2603310
AS40641MGWTEL - MGW Telephone Company, Inc.2602,41812
AS54883CORVA - City of Richmond, Virginia2603320
AS32540HP-HOOD - HP Hood2593320
AS399938BHE-TRANSIT - Berkshire Hathaway Energy Company2593300
AS11739CHIRISA-TECHNOLOGY-PARKS-01 - Digital Fortress, Inc.2523210
AS15173NEWMA-11 - Newmarket Corporation2526410
AS394276TAF - TurnAround Factor, Inc.2460332
AS395772AHC-AS - Augusta Health Care, Inc2352890
AS14583VITA-VSP-1 - Virginia Information Technologies Agency (VITA)2332920
AS36244SVEC - Shenandoah Valley Electric Cooperative2302830
AS19923SHENANDOAH-UNIV - Shenandoah University2273220
AS2134GSVNET-AS Santander Global Technology and Operations, S.L.2004920
AS397039WORLDSTRIDES - WorldStrides1041420
AS401426MHN - St. Mary's Medical Center, Inc.671980
AS394058TELOSC-ASH - Telos Corporation411040
AS397483ACBO-185 - UNIVERSAL HEALTH SERVICES41520
AS63468INFINITTNA - Infinitt North America, Inc.37410
AS393613VACU-ASN-1 - Virginia Credit Union, Inc.32420
AS18773HENRICO-AS - County of Henrico234200
AS399607LCPS-VA - Louisa County Public Schools18240
AS10794BANKAMERICA - Bank of America, National Association11280
AS19404QUEST - Quest11260
AS46643VIRGINIA-COLLEGE-SAVINGS-PLAN - Virginia College Savings Plan11140
AS396452LOUDOUN-WATER - Loudoun Water11140
AS23209VHDA20011260123220 - Virginia Housing Development Authority10130
AS30299THE-MARTIN-AGENCY-HQ - THE MARTIN AGENCY10130
AS62971COUNTY-OF-CHESTERFIELD-VA - County of Chesterfield10110
AS395527—10110
AS11679STIHL-204-124-67 - Stihl Inc.9360
AS54391CRUTCHFIELD - Crutchfield New Media LLC9101
AS393591GAMEWOODTECHNOLOGYGROUP - Gamewood Technology Group, Inc.9360
AS399232SETON-HOME - Seton Home Study School9110
AS17381AS-WSI-ECOM-WEST - Williams-Sonoma8160
AS397190WSP-DIGITAL - WSP888
AS22274SMP-VIR - Standard Motor Products, Inc780
AS54751VEDP - Virginia Economic Development Partnership780
AS27341GFNET-AS01 - Gannet Fleming, Inc.670
AS395441EDGECONNEX-ASN - EdgeConneX, INC690
AS27326VHSA-AS - VCU HEALTH SYSTEM AUTHORITY5420
AS398475DRILLINGINFO-VIRGINIA - Drilling Info Inc.570
AS393415LITTNET - LITTLER MENDELSON, P.C.330

Raw RDAP Response

{
  "endAutnum": 21508,
  "entities": [
    {
      "entities": [
        {
          "events": [
            {
              "eventAction": "last changed",
              "eventDate": "2026-05-21T11:13:31-04:00"
            },
            {
              "eventAction": "registration",
              "eventDate": "2002-09-30T17:45:14-04:00"
            }
          ],
          "handle": "NAPO-ARIN",
          "links": [
            {
              "href": "https://rdap.arin.net/registry/entity/NAPO-ARIN",
              "rel": "self",
              "type": "application/rdap+json",
              "value": "https://rdap.arin.net/registry/autnum/21508"
            },
            {
              "href": "https://whois.arin.net/rest/poc/NAPO-ARIN",
              "rel": "alternate",
              "type": "application/xml",
              "value": "https://rdap.arin.net/registry/autnum/21508"
            }
          ],
          "objectClassName": "entity",
          "port43": "whois.arin.net",
          "remarks": [
            {
              "description": [
                "This contact is to be used for network abuse, spam/phishing, and legally constituted requests for information or action. It is not for any other purpose."
              ],
              "title": "Registration Comments"
            }
          ],
          "roles": [
            "abuse"
          ],
          "status": [
            "validated"
          ],
          "vcardArray": [
            "vcard",
            [
              [
                "version",
                {},
                "text",
                "4.0"
              ],
              [
                "adr",
                {
                  "label": "1800 Bishops Gate Blvd\nMount Laurel\nNJ\n08054\nUnited States"
                },
                "text",
                [
                  "",
                  "",
                  "",
                  "",
                  "",
                  "",
                  ""
                ]
              ],
              [
                "fn",
                {},
                "text",
                "Network Abuse and Policy Observance"
              ],
              [
                "org",
                {},
                "text",
                "Comcast Cable Communications, Inc."
              ],
              [
                "kind",
                {},
                "text",
                "group"
              ],
              [
                "email",
                {},
                "text",
                "[email protected]"
              ],
              [
                "tel",
                {
                  "type": [
                    "work",
                    "voice"
                  ]
                },
                "text",
                "+1-888-565-4329"
              ]
            ]
          ]
        },
        {
          "events": [
            {
              "eventAction": "last changed",
              "eventDate": "2026-09-02T12:36:43-04:00"
            },
            {
              "eventAction": "registration",
              "eventDate": "2020-11-18T14:40:04-05:00"
            }
          ],
          "handle": "ROUTI25-ARIN",
          "links": [
            {
              "href": "https://rdap.arin.net/registry/entity/ROUTI25-ARIN",
              "rel": "self",
              "type": "application/rdap+json",
              "value": "https://rdap.arin.net/registry/autnum/21508"
            },
            {
              "href": "https://whois.arin.net/rest/poc/ROUTI25-ARIN",
              "rel": "alternate",
              "type": "application/xml",
              "value": "https://rdap.arin.net/registry/autnum/21508"
            }
          ],
          "objectClassName": "entity",
          "port43": "whois.arin.net",
          "remarks": [
            {
              "description": [
                "Issues related to Routing, RPKI, Route Registry.",
                "Not monitored 24/7.",
                "Please email, there is no available phone number."
              ],
              "title": "Registration Comments"
            }
          ],
          "roles": [
            "routing"
          ],
          "status": [
            "validated"
          ],
          "vcardArray": [
            "vcard",
            [
              [
                "version",
                {},
                "text",
                "4.0"
              ],
              [
                "adr",
                {
                  "label": "1800 Bishops Gate Blvd\nMt Laurel\nNJ\n08054\nUnited States"
                },
                "text",
                [
                  "",
                  "",
                  "",
                  "",
                  "",
                  "",
                  ""
                ]
              ],
              [
                "fn",
                {},
                "text",
                "Routing"
              ],
              [
                "org",
                {},
                "text",
                "Comcast"
              ],
              [
                "kind",
                {},
                "text",
                "group"
              ],
              [
                "email",
                {},
                "text",
                "[email protected]"
              ],
              [
                "tel",
                {
                  "type": [
                    "work",
                    "voice"
                  ]
                },
                "text",
                "+1-856-792-2300"
              ]
            ]
          ]
        },
        {
          "events": [
            {
              "eventAction": "last changed",
              "eventDate": "2026-09-21T12:18:12-04:00"
            },
            {
              "eventAction": "registration",
              "eventDate": "2002-06-12T11:30:41-04:00"
            }
          ],
          "handle": "IC161-ARIN",
          "links": [
            {
              "href": "https://rdap.arin.net/registry/entity/IC161-ARIN",
              "rel": "self",
              "type": "application/rdap+json",
              "value": "https://rdap.arin.net/registry/autnum/21508"
            },
            {
              "href": "https://whois.arin.net/rest/poc/IC161-ARIN",
              "rel": "alternate",
              "type": "application/xml",
              "value": "https://rdap.arin.net/registry/autnum/21508"
            }
          ],
          "objectClassName": "entity",
          "port43": "whois.arin.net",
          "remarks": [
            {
              "description": [
                "This is not an Abuse, Spam, or Legal notification POC.",
                "Please use [email protected] for all security, takedown, and emergency issues. This IP Registration address cannot address those issues.",
                "Please email, there is no available phone number."
              ],
              "title": "Registration Comments"
            }
          ],
          "roles": [
            "technical",
            "administrative"
          ],
          "status": [
            "validated"
          ],
          "vcardArray": [
            "vcard",
            [
              [
                "version",
                {},
                "text",
                "4.0"
              ],
              [
                "adr",
                {
                  "label": "1800 Bishops Gate Blvd\nMount Laurel\nNJ\n08054\nUnited States"
                },
                "text",
                [
                  "",
                  "",
                  "",
                  "",
                  "",
                  "",
                  ""
                ]
              ],
              [
                "fn",
                {},
                "text",
                "Comcast Cable Communications Inc"
              ],
              [
                "org",
                {},
                "text",
                "Comcast Cable Communications, Inc."
              ],
              [
                "kind",
                {},
                "text",
                "group"
              ],
              [
                "email",
                {},
                "text",
                "[email protected]"
              ],
              [
                "tel",
                {
                  "type": [
                    "work",
                    "voice"
                  ]
                },
                "text",
                "+1-856-792-2300"
              ]
            ]
          ]
        }
      ],
      "events": [
        {
          "eventAction": "last changed",
          "eventDate": "2020-11-18T14:58:28-05:00"
        },
        {
          "eventAction": "registration",
          "eventDate": "2001-09-18T00:00:00-04:00"
        }
      ],
      "handle": "CCCS",
      "links": [
        {
          "href": "https://rdap.arin.net/registry/entity/CCCS",
          "rel": "self",
          "type": "application/rdap+json",
          "value": "https://rdap.arin.net/registry/autnum/21508"
        },
        {
          "href": "https://whois.arin.net/rest/org/CCCS",
          "rel": "alternate",
          "type": "application/xml",
          "value": "https://rdap.arin.net/registry/autnum/21508"
        }
      ],
      "objectClassName": "entity",
      "port43": "whois.arin.net",
      "roles": [
        "registrant"
      ],
      "vcardArray": [
        "vcard",
        [
          [
            "version",
            {},
            "text",
            "4.0"
          ],
          [
            "fn",
            {},
            "text",
            "Comcast Cable Communications, LLC"
          ],
          [
            "adr",
            {
              "label": "1800 Bishops Gate Blvd\nMt Laurel\nNJ\n08054\nUnited States"
            },
            "text",
            [
              "",
              "",
              "",
              "",
              "",
              "",
              ""
            ]
          ],
          [
            "kind",
            {},
            "text",
            "org"
          ]
        ]
      ]
    }
  ],
  "events": [
    {
      "eventAction": "last changed",
      "eventDate": "2021-01-25T15:20:02-05:00"
    },
    {
      "eventAction": "registration",
      "eventDate": "2001-05-16T00:00:00-04:00"
    }
  ],
  "handle": "AS21508",
  "links": [
    {
      "href": "https://rdap.arin.net/registry/autnum/21508",
      "rel": "self",
      "type": "application/rdap+json",
      "value": "https://rdap.arin.net/registry/autnum/21508"
    },
    {
      "href": "https://whois.arin.net/rest/asn/AS21508",
      "rel": "alternate",
      "type": "application/xml",
      "value": "https://rdap.arin.net/registry/autnum/21508"
    }
  ],
  "name": "COMCAST-21508",
  "notices": [
    {
      "description": [
        "By using the ARIN RDAP/Whois service, you are agreeing to the RDAP/Whois Terms of Use"
      ],
      "links": [
        {
          "href": "https://www.arin.net/resources/registry/whois/tou/",
          "rel": "terms-of-service",
          "type": "text/html",
          "value": "https://rdap.arin.net/registry/autnum/21508"
        }
      ],
      "title": "Terms of Service"
    },
    {
      "description": [
        "If you see inaccuracies in the results, please visit: "
      ],
      "links": [
        {
          "href": "https://www.arin.net/resources/registry/whois/inaccuracy_reporting/",
          "rel": "inaccuracy-report",
          "type": "text/html",
          "value": "https://rdap.arin.net/registry/autnum/21508"
        }
      ],
      "title": "Whois Inaccuracy Reporting"
    },
    {
      "description": [
        "Copyright 1997-2026, American Registry for Internet Numbers, Ltd."
      ],
      "title": "Copyright Notice"
    }
  ],
  "objectClassName": "autnum",
  "port43": "whois.arin.net",
  "rdapConformance": [
    "nro_rdap_profile_0",
    "rdap_level_0",
    "nro_rdap_profile_asn_flat_0"
  ],
  "startAutnum": 21508,
  "status": [
    "active"
  ]
}

Contact details of private individuals are redacted.