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AS21508

COMCAST-21508

Comcast Cable Communications, LLC

Registry

Authoritative registration data

AS number
21508
Name
COMCAST-21508
Organisation
Comcast Cable Communications, LLC
Country
—
RIR
ARIN
Registered
Source:asn:rdap retrieved

IPv4 prefixes

17

IPv6 prefixes

61

Total announced

78

Announced prefixes

Observed in BGP by route collectors, not a registry allocation list

Prefixes announced by AS21508
141.104.0.0/16 IPv4 /16 not checked
198.90.112.0/22 IPv4 /22 not checked
157.240.147.0/24 IPv4 /24 not checked
157.240.148.0/24 IPv4 /24 not checked
173.242.174.0/24 IPv4 /24 not checked
204.194.47.0/24 IPv4 /24 not checked
205.223.19.0/24 IPv4 /24 not checked
50.204.101.0/24 IPv4 /24 not checked
50.205.217.0/24 IPv4 /24 not checked
50.216.229.0/24 IPv4 /24 not checked
50.217.1.0/24 IPv4 /24 not checked
50.217.207.0/24 IPv4 /24 not checked
50.218.47.0/24 IPv4 /24 not checked
50.228.113.0/24 IPv4 /24 not checked
50.229.113.0/24 IPv4 /24 not checked
50.229.114.0/24 IPv4 /24 not checked
50.235.34.0/24 IPv4 /24 not checked
2001:559:220::/48 IPv6 /48 not checked
2001:559:243::/48 IPv6 /48 not checked
2001:559:280::/48 IPv6 /48 not checked
2001:559:37d::/48 IPv6 /48 not checked
2001:559:3ac::/48 IPv6 /48 not checked
2001:559:3b9::/48 IPv6 /48 not checked
2001:559:3c8::/48 IPv6 /48 not checked
2001:559:40a::/48 IPv6 /48 not checked
2001:559:49a::/48 IPv6 /48 not checked
2001:559:49b::/48 IPv6 /48 not checked
2001:559:53c::/48 IPv6 /48 not checked
2001:559:5c9::/48 IPv6 /48 not checked
2001:559:5db::/48 IPv6 /48 not checked
2001:559:72b::/48 IPv6 /48 not checked
2001:559:73c::/48 IPv6 /48 not checked
2001:559:788::/48 IPv6 /48 not checked
2001:559:78a::/48 IPv6 /48 not checked
2001:559:79d::/48 IPv6 /48 not checked
2001:559:79e::/48 IPv6 /48 not checked
2001:559:7a7::/48 IPv6 /48 not checked
2001:559:7db::/48 IPv6 /48 not checked
2001:559:804c::/48 IPv6 /48 RPKI valid
2001:559:81bf::/48 IPv6 /48 RPKI valid
2001:559:81d7::/48 IPv6 /48 not checked
2001:559:81d8::/48 IPv6 /48 not checked
2001:559:8201::/48 IPv6 /48 not checked
2001:559:82fd::/48 IPv6 /48 not checked
2001:559:833e::/48 IPv6 /48 not checked
2001:559:8416::/48 IPv6 /48 not checked
2001:559:841c::/48 IPv6 /48 RPKI valid
2001:559:8445::/48 IPv6 /48 not checked
2001:559:8535::/48 IPv6 /48 not checked
2001:559:85c1::/48 IPv6 /48 not checked
2001:559:85ff::/48 IPv6 /48 not checked
2001:559:8604::/48 IPv6 /48 not checked
2001:559:871a::/48 IPv6 /48 not checked
2001:559:875f::/48 IPv6 /48 not checked
2001:559:8773::/48 IPv6 /48 not checked
2001:559:87b2::/48 IPv6 /48 not checked
2001:559:8a::/48 IPv6 /48 not checked
2001:559:c071::/48 IPv6 /48 not checked
2001:559:c0::/48 IPv6 /48 not checked
2001:559:c0f6::/48 IPv6 /48 not checked
2001:559:c0f7::/48 IPv6 /48 not checked
2001:559:c10a::/48 IPv6 /48 not checked
2001:559:c174::/48 IPv6 /48 not checked
2001:559:c1a5::/48 IPv6 /48 not checked
2001:559:c1ca::/48 IPv6 /48 not checked
2001:559:c28f::/48 IPv6 /48 not checked
2001:559:c290::/48 IPv6 /48 not checked
2001:559:c2a7::/48 IPv6 /48 not checked
2001:559:c344::/48 IPv6 /48 not checked
2001:559:c3e9::/48 IPv6 /48 not checked
2001:559:c458::/48 IPv6 /48 not checked
2001:559:c45f::/48 IPv6 /48 not checked
2001:559:c460::/48 IPv6 /48 not checked
2001:559:c4db::/48 IPv6 /48 not checked
2001:559:c4f6::/48 IPv6 /48 not checked
2001:559:c515::/48 IPv6 /48 not checked
2001:559:c538::/48 IPv6 /48 not checked
2001:559:f7::/48 IPv6 /48 not checked

No rows match “”.

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Source:ripestat:announced-prefixes observed

Internet Exchanges

Exchanges where this network has a listed peering LAN connection

No Internet Exchange memberships found

The exchange directory has no current membership records for this AS.

Source:peeringdb retrieved

Exchange membership means the network has a listed connection; it does not prove peering with other members.

Observed adjacencies

Networks seen next to AS21508 in BGP paths by route collectors.

Source:ripestat:asn-neighbours observed

Observed upstreams

1 networks seen before AS21508 in AS paths

Observed upstreams
Families
AS7922 COMCAST-7922 3,915 19,194
v4 v6

No rows match “”.

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Observed downstreams

50 networks seen after AS21508 in AS paths

Observed downstreams
Families
AS40641 MGWTEL 149 1,120
v4 v6
AS15297 EPLUS-ASN 142 501
v4
AS400114 APOG-RBC 150 334
v4
AS396083 ARVUS-160-84 147 333
v4
AS394058 TELOSC-ASH 140 330
v4
AS13335 CLOUDFLARENET 271 325
v4 v6
AS54113 FASTLY 188 324
v4 v6
AS15173 NEWMA-11 136 314
v4
AS2134 GSVNET-AS 124 278
v4
AS18773 HENRICO-AS 14 255
v4
AS401426 MARSHALL-HEALTH-NETWORK-02 135 241
v4 v6
AS36364 MHSNET 146 168
v4
AS402549 TERRASERVERS-NET 144 167
v4
AS399099 PCPS-ASN 143 167
v4
AS399938 BHE-TRANSIT 143 167
v4
AS54219 SCHAWK-INC 142 167
v4
AS54883 CORVA 142 167
v4
AS32540 HP-HOOD 141 167
v4
AS36040 YOUTUBE 141 166
v4
AS11739 CHIRISA-TECHNOLOGY-PARKS-01 134 158
v4
AS394276 TAF 130 158
v6
AS19923 SHENANDOAH-UNIV 125 152
v4
AS395772 AHC-AS 131 148
v4
AS36244 SVEC 129 146
v4
AS14583 VITA-VSP-1 128 146
v4
AS397039 WORLDSTRIDES 59 74
v4
AS63468 INFINITTNA 24 26
v4
AS397483 ACBO-185 16 18
v4
AS393613 VACU-ASN-1 13 15
v4
AS399607 LCPS-VA 11 15
v4
AS19404 QUEST 6 12
v4
AS11679 STIHL-204-124-67 4 12
v4
AS399232 SETON-HOME 7 8
v4
AS397190 WSP-DIGITAL 3 7
v4 v6
AS27326 VHSA-AS 1 7
v4
AS10794 BANKAMERICA 3 6
v4
AS17381 AS-WSI-ECOM-WEST 3 6
v4
AS23209 VHDA20011260123220 4 4
v4
AS27341 GFNET-AS01 4 4
v4
AS30299 THE-MARTIN-AGENCY-HQ 4 4
v4
AS62971 COUNTY-OF-CHESTERFIELD-VA 4 4
v4
AS395527 4 4
v4
AS393591 GAMEWOODTECHNOLOGYGROUP 3 4
v4
AS22274 SMP-VIR 3 3
v4
AS46643 VIRGINIA-COLLEGE-SAVINGS-PLAN 3 3
v4
AS54391 CRUTCHFIELD 3 3
v4
AS396452 LOUDOUN-WATER 3 3
v4
AS54751 VEDP 2 2
v4
AS395441 EDGECONNEX-ASN 2 2
v4
AS398475 DRILLINGINFO-VIRGINIA 2 2
v4

No rows match “”.

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Note:
These are observed adjacencies derived from BGP path data, not confirmed commercial relationships. A network appearing before another in an AS path does not establish that it is a paying transit customer, a settlement free peer, or anything else contractual.