AS21508 Comcast Cable Communications, LLC details

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AS21508 – Comcast Cable Communications, LLC

Field	Value
Country	United States
Website	comcast.com
Hosted domains	6
Number of IPv4	71,936
Number of IPv6	82,206,955,733,794,783,880,019,968
ASN type	Business
Registry	arin
Allocated	24 years ago on May 16, 2001
Updated	5 years ago on Jan 25, 2021

Netblock	Company	Num of IPs
141.104.0.0/16	Virginia Department of Education	65,536
198.90.112.0/22	WhiteSky Communications, LLC.	1,024
50.219.12.0/22	Comcast Cable Communications, LLC	1,024
157.240.147.0/24	Facebook, Inc.	256
157.240.148.0/24	Facebook, Inc.	256
173.242.174.0/24	County of Henrico	256
204.194.47.0/24	Va. Dept. of Rehabilitative Services	256
205.223.19.0/24	Virginia State Lottery Department	256
50.204.101.0/24	Comcast Cable Communications, LLC	256
50.205.217.0/24	Comcast Cable Communications, LLC	256
50.216.229.0/24	Comcast Cable Communications, LLC	256
50.217.1.0/24	Comcast Cable Communications, LLC	256
50.217.207.0/24	Comcast Cable Communications, LLC	256
50.218.47.0/24	Comcast Cable Communications, LLC	256
50.220.111.0/24	Custom Computers	256
50.227.24.0/24	Comcast Cable Communications, LLC	256
50.228.113.0/24	Comcast Cable Communications, LLC	256
50.229.113.0/24	Comcast Cable Communications, LLC	256
50.229.114.0/24	Comcast Cable Communications, LLC	256
50.235.34.0/24	Comcast Cable Communications, LLC	256

Netblock	Company
2001:559:220::/48	Comcast Cable Communications, LLC
2001:559:243::/48	Comcast Cable Communications, LLC
2001:559:280::/48	Comcast Cable Communications, LLC
2001:559:37d::/48	Comcast Cable Communications, LLC
2001:559:3ac::/48	Comcast Cable Communications, LLC
2001:559:3b9::/48	Comcast Cable Communications, LLC
2001:559:3c8::/48	Comcast Cable Communications, LLC
2001:559:40a::/48	Comcast Cable Communications, LLC
2001:559:49a::/48	Comcast Cable Communications, LLC
2001:559:49b::/48	Comcast Cable Communications, LLC
2001:559:4b6::/48	Comcast Cable Communications, LLC
2001:559:53c::/48	Comcast Cable Communications, LLC
2001:559:5c9::/48	Comcast Cable Communications, LLC
2001:559:5db::/48	Comcast Cable Communications, LLC
2001:559:720::/48	Comcast Cable Communications, LLC
2001:559:72b::/48	Comcast Cable Communications, LLC
2001:559:73c::/48	Comcast Cable Communications, LLC
2001:559:788::/48	Comcast Cable Communications, LLC
2001:559:78a::/48	Comcast Cable Communications, LLC
2001:559:79d::/48	Comcast Cable Communications, LLC
2001:559:79e::/48	Comcast Cable Communications, LLC
2001:559:7a7::/48	Comcast Cable Communications, LLC
2001:559:7db::/48	Comcast Cable Communications, LLC
2001:559:804c::/48	Comcast Cable Communications, LLC
2001:559:81bf::/48	Comcast Cable Communications, LLC
2001:559:81d7::/48	Comcast Cable Communications, LLC
2001:559:81d8::/48	Comcast Cable Communications, LLC
2001:559:8201::/48	Comcast Cable Communications, LLC
2001:559:82fd::/48	Comcast Cable Communications, LLC
2001:559:833e::/48	Comcast Cable Communications, LLC
2001:559:8416::/48	Comcast Cable Communications, LLC
2001:559:841c::/48	Comcast Cable Communications, LLC
2001:559:8445::/48	Comcast Cable Communications, LLC
2001:559:84a7::/48	Comcast Cable Communications, LLC
2001:559:8535::/48	Comcast Cable Communications, LLC
2001:559:85c1::/48	Comcast Cable Communications, LLC
2001:559:85ff::/48	Comcast Cable Communications, LLC
2001:559:8604::/48	Comcast Cable Communications, LLC
2001:559:871a::/48	Comcast Cable Communications, LLC
2001:559:875f::/48	Comcast Cable Communications, LLC
2001:559:8773::/48	Comcast Cable Communications, LLC
2001:559:87b2::/48	Comcast Cable Communications, LLC
2001:559:8a::/48	Comcast Cable Communications, LLC
2001:559:c0::/48	Comcast Cable Communications, LLC
2001:559:c071::/48	Comcast Cable Communications, LLC
2001:559:c0f6::/48	Comcast Cable Communications, LLC
2001:559:c0f7::/48	Comcast Cable Communications, LLC
2001:559:c0fa::/48	Comcast Cable Communications, LLC
2001:559:c10a::/48	Comcast Cable Communications, LLC
2001:559:c174::/48	Comcast Cable Communications, LLC
2001:559:c1a5::/48	Comcast Cable Communications, LLC
2001:559:c1ca::/48	Comcast Cable Communications, LLC
2001:559:c28f::/48	Comcast Cable Communications, LLC
2001:559:c290::/48	Comcast Cable Communications, LLC
2001:559:c2a7::/48	Comcast Cable Communications, LLC
2001:559:c344::/48	Comcast Cable Communications, LLC
2001:559:c3e9::/48	Comcast Cable Communications, LLC
2001:559:c458::/48	Comcast Cable Communications, LLC
2001:559:c45f::/48	Comcast Cable Communications, LLC
2001:559:c460::/48	Comcast Cable Communications, LLC
2001:559:c495::/48	Comcast Cable Communications, LLC
2001:559:c4c8::/48	Comcast Cable Communications, LLC
2001:559:c4c9::/48	Comcast Cable Communications, LLC
2001:559:c4db::/48	Comcast Cable Communications, LLC
2001:559:c4f6::/48	Comcast Cable Communications, LLC
2001:559:c515::/48	Comcast Cable Communications, LLC
2001:559:c538::/48	Comcast Cable Communications, LLC
2001:559:f7::/48	Comcast Cable Communications, LLC

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WHOIS Details

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                                                ASHandle:       AS21508
                                                OrgID:          AS21508
                                                ASName:         AS21508
                                                ASNumber:       AS21508
                                                RegDate:        0000-00-00
                                                Updated:        0000-00-00
                                                TechHandle:     AA00-AAAA
                                                Source:         AAAA

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Hosted Domains

There are 6 domain names hosted across 7 IP addresses on this ASN.

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IP Address	Domain	Domains on this IP
50.204.101.61	██████████	1
141.104.145.20	██████████	1
173.242.174.203	██████████	1
50.204.101.60	██████████	1
50.235.34.25	██████████	1
50.205.217.50	██████████	1
50.216.229.251	██████████	1

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Peers

There are 48 peers for this ASN.

Peers	Name
AS10794	Bank of America, National Association
AS11679	Stihl Inc.
AS11739	Digital Fortress, Inc.
AS13335	Cloudflare, Inc.
AS13952	New College Institute
AS14583	Virginia Information Technologies Agency (VITA)
AS15173	Newmarket Corporation
AS15297	EPLUS, Inc.
AS17381	Williams-Sonoma
AS18773	County of Henrico
AS19923	Shenandoah University
AS20332	Winchester Wireless
AS2134	Santander Global Technology, S.L.U
AS22274	Standard Motor Products, Inc
AS23209	Virginia Housing Development Authority
AS27326	VCU HEALTH SYSTEM AUTHORITY
AS27341	Gannet Fleming, Inc.
AS30299	THE MARTIN AGENCY
AS32540	HP Hood
AS36040	Google LLC
AS36244	Shenandoah Valley Electric Cooperative
AS36364	Mary Washington Hospital, Inc.
AS393415	LITTLER MENDELSON, P.C.
AS393591	Gamewood Technology Group, Inc.
AS393613	Virginia Credit Union, Inc.
AS394058	Telos Corporation
AS395441	EdgeConneX, INC
AS395527	VSU_AS395527
AS395772	Augusta Health Care, Inc
AS396083	Framatome Inc.
AS396452	Loudoun Water
AS397039	WorldStrides
AS397190	WSP
AS397483	UNIVERSAL HEALTH SERVICES
AS398475	Drilling Info Inc.
AS399099	petersburg city public schools
AS399232	Seton Home Study School
AS399607	Louisa County Public Schools
AS400114	Apogee Telecom Inc.
AS40485	SANDY SPRING BANK
AS40641	MGW Telephone Company, Inc.
AS46643	Virginia College Savings Plan
AS54219	Matthews International Corporation
AS54391	Crutchfield New Media LLC
AS54883	City of Richmond, Virginia
AS62971	County of Chesterfield
AS63468	Infinitt North America, Inc.
AS7922	Comcast Cable Communications, LLC

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ASN API

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Upstreams

There is 1 peer for this ASN.

upstreams	Name
AS7922	Comcast Cable Communications, LLC

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ASN API

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Downstreams

There are 47 downstreams for this ASN.

Downstreams	Name
AS10794	Bank of America, National Association
AS11679	Stihl Inc.
AS11739	Digital Fortress, Inc.
AS13335	Cloudflare, Inc.
AS13952	New College Institute
AS14583	Virginia Information Technologies Agency (VITA)
AS15173	Newmarket Corporation
AS15297	EPLUS, Inc.
AS17381	Williams-Sonoma
AS18773	County of Henrico
AS19923	Shenandoah University
AS20332	Winchester Wireless
AS2134	Santander Global Technology, S.L.U
AS22274	Standard Motor Products, Inc
AS23209	Virginia Housing Development Authority
AS27326	VCU HEALTH SYSTEM AUTHORITY
AS27341	Gannet Fleming, Inc.
AS30299	THE MARTIN AGENCY
AS32540	HP Hood
AS36040	Google LLC
AS36244	Shenandoah Valley Electric Cooperative
AS36364	Mary Washington Hospital, Inc.
AS393415	LITTLER MENDELSON, P.C.
AS393591	Gamewood Technology Group, Inc.
AS393613	Virginia Credit Union, Inc.
AS394058	Telos Corporation
AS395441	EdgeConneX, INC
AS395527	VSU_AS395527
AS395772	Augusta Health Care, Inc
AS396083	Framatome Inc.
AS396452	Loudoun Water
AS397039	WorldStrides
AS397190	WSP
AS397483	UNIVERSAL HEALTH SERVICES
AS398475	Drilling Info Inc.
AS399099	petersburg city public schools
AS399232	Seton Home Study School
AS399607	Louisa County Public Schools
AS400114	Apogee Telecom Inc.
AS40485	SANDY SPRING BANK
AS40641	MGW Telephone Company, Inc.
AS46643	Virginia College Savings Plan
AS54219	Matthews International Corporation
AS54391	Crutchfield New Media LLC
AS54883	City of Richmond, Virginia
AS62971	County of Chesterfield
AS63468	Infinitt North America, Inc.

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ASN API

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Pingable IPs

18 IPs in this ASN replied to an ICMP ping during our most recent internet scan. Learn more.

IP Address	ASN	Details
157.240.148.43	AS21508 Comcast Cable Communications, LLC	`4.42ms` from Ashburn, US
157.240.147.32	AS21508 Comcast Cable Communications, LLC	`11.60ms` from Atlanta, US
50.219.13.30	AS21508 Comcast Cable Communications, LLC	`9.57ms` from Ashburn, US
50.228.113.1	AS21508 Comcast Cable Communications, LLC	`3.75ms` from Ashburn, US
50.217.1.1	AS21508 Comcast Cable Communications, LLC	`3.54ms` from Ashburn, US
50.219.12.43	AS21508 Comcast Cable Communications, LLC	`6.61ms` from Ashburn, US
50.216.229.1	AS21508 Comcast Cable Communications, LLC	`2.93ms` from Ashburn, US
173.242.174.1	AS21508 Comcast Cable Communications, LLC	`5.08ms` from Ashburn, US
50.204.101.75	AS21508 Comcast Cable Communications, LLC	`3.83ms` from Ashburn, US
50.229.113.2	AS21508 Comcast Cable Communications, LLC	`5.83ms` from Ashburn, US
205.223.19.19	AS21508 Comcast Cable Communications, LLC	`5.03ms` from Ashburn, US
50.235.34.0	AS21508 Comcast Cable Communications, LLC	`11.71ms` from Atlanta, US
50.205.217.248	AS21508 Comcast Cable Communications, LLC	`5.01ms` from Ashburn, US
2001:559:c290:5::946	AS21508 Comcast Cable Communications, LLC	`13.36ms` from Atlanta, US
50.218.47.2	AS21508 Comcast Cable Communications, LLC	`12.56ms` from Atlanta, US
198.90.112.1	AS21508 Comcast Cable Communications, LLC	`2.96ms` from Ashburn, US
50.217.207.4	AS21508 Comcast Cable Communications, LLC	`8.21ms` from Ashburn, US
2001:559:49b:1f07:dead:beef:123:157	AS21508 Comcast Cable Communications, LLC	`6.28ms` from Ashburn, US

Other Pingable IPs

Below is a random selection of 25 IPs that replied to an ICMP ping during our most recent internet scan.

IP Address	ASN	Details
106.87.58.132	AS4134 CHINANET-BACKBONE	`10.98ms` from Chongqing, CN
34.60.171.228	AS396982 Google LLC	`0.12ms` from Council Bluffs, US
106.215.103.4	AS24560 Bharti Airtel Ltd., Telemedia Services	`9.46ms` from Delhi, IN
34.253.99.212	AS16509 Amazon.com, Inc.	`0.24ms` from Dublin, IE
81.98.17.132	AS5089 Virgin Media Limited	`15.24ms` from Dublin, IE
78.50.202.148	AS6805 Telefonica Germany GmbH & Co.OHG	`6.00ms` from Hamburg, DE
103.141.30.4	AS137503 Spidernet Co.,Ltd	`7.28ms` from Ho Chi Minh City, VN
72.134.117.180	AS20001 Charter Communications Inc	`6.38ms` from Los Angeles, US
98.225.112.68	AS7922 Comcast Cable Communications, LLC	`15.35ms` from Los Angeles, US
185.33.15.20	AS200741 EasyTeam SAS	`1.76ms` from Paris, FR
112.158.111.212	AS17858 LG POWERCOMM	`2.40ms` from Seoul, KR
115.17.146.180	AS4766 Korea Telecom	`6.83ms` from Seoul, KR
115.144.134.180	AS4766 Korea Telecom	`1.01ms` from Seoul, KR
116.59.69.164	AS17421 Mobile Business Group	`6.83ms` from Taipei, TW
3.165.25.20	AS16509 Amazon.com, Inc.	`0.96ms` from Tokyo, JP
204.111.136.132	AS4922 Shenandoah Cable Television LLC	`1.85ms` from Ashburn, US
20.121.67.180	AS8075 Microsoft Corporation	`0.62ms` from Ashburn, US
47.247.19.100	AS55836 Reliance Jio Infocomm Limited	`6.37ms` from Bengaluru, IN
68.146.49.20	AS6327 Shaw Communications Inc.	`5.10ms` from Calgary, CA
116.205.232.180	AS55990 Huawei Cloud Service data center	`1.61ms` from Guangzhou, CN
77.8.45.68	AS6805 Telefonica Germany GmbH & Co.OHG	`1.08ms` from Hamburg, DE
3.239.221.180	AS14618 Amazon.com, Inc.	`0.14ms` from Reston, US
69.42.4.68	AS11404 Wave Broadband	`5.46ms` from San Jose, US
104.68.96.20	AS16625 Akamai Technologies, Inc.	`0.52ms` from San Jose, US
13.209.158.228	AS16509 Amazon.com, Inc.	`0.19ms` from Seoul, KR

Traceroute

Below is a recent traceroute taken from the IPinfo ProbeNet to an IP in this ASN. Learn more.

traceroute -a -n -q1 -m14 141.104.101.221

traceroute to 141.104.101.221 (141.104.101.221): 14 hops max, 52 byte packets

1 [AS149573] 103.183.157.1 0.665 ms

2 *

3 [] 182.79.247.94 219.875 ms

4 *

5 *

6 *

7 [AS7922] 96.110.43.206 270.345 ms

8 [AS7922] 68.86.172.250 266.584 ms

9 [AS7922] 96.110.203.22 271.981 ms

10 [AS7922] 96.110.203.25 270.877 ms

11 [AS7922] 96.110.203.58 262.739 ms

12 *

13 *

14 *

Measurement taken from

IPinfo ProbeNet in Bengaluru, IN

On August 22nd 2025

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What is an ASN?

Autonomous System Numbers (ASNs) are assigned to entities such as Internet Service Providers and other large organizations that control blocks of IP addresses. This network page, and the organization field that's shown on the main IP address information page and also returned in the geolocation API are based on the ASN.

The ASN details will often correspond to the IP address owner, but for smaller organizations it may be that organization's parent, or their ISP. Find out more about AS21508 at robtex.

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