COMCAST CORPORATION
One corporate group, resolved across 10 separately-registered clusters
in the same GLEIF corporate family (ultimate parent LEI 51M0QTTNCGUN7KFCFZ59). Each
member's own registration independently matches the family, so clusters that merely inherited a carrier's
LEI are excluded.
Data as of 2026-09-20
10 clusters ·
4,702 netblocks ·
79,467,701 IPv4 addresses ·
3,204 IPv6 prefixes ·
4 countries
IPv6 ranges (3,204)
showing the 500 largest allocations- 2601::/20
- 2603:2000::/20
- 2603:3000::/24
- 2a0e:400::/25
- 2001:558::/29
- 2a01:f8c0::/29
- 2a02:c78::/29
- 2a06:5900::/29
- 2a0a:f400::/29
- 2a0c:1900::/29
- 2a0c:93c0::/29
- 2a0e:7dc0::/29
- 2a02:c7c::/30
- 2a06:5902::/31
- 2a06:5904::/31
- 2a06:5906::/31
- 2803:9040::/32
- 2a00:83a0::/32
- 2a00:9d60::/32
- 2a01:f8c0::/32
- 2a01:f8c1::/32
- 2a01:f8c2::/32
- 2a01:f8c3::/32
- 2a01:f8c4::/32
- 2a01:f8c5::/32
- 2a01:f8c6::/32
- 2a01:f8c7::/32
- 2a02:c7a::/32
- 2a02:c7b::/32
- 2a06:5900::/32
- 2a02:c7c:8000::/33
- 2a02:c7c::/33
- 2a02:c7d:8000::/33
- 2a02:c7d::/33
- 2a02:c7e:8000::/33
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- 2a02:c7f:8000::/33
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- 2a06:5901::/33
- 2a06:5900:4000::/34
- 2a06:5900:8000::/34
- 2a06:5900::/34
- 2a06:5900:c000::/34
- 2620:152::/36
- 2a02:c78::/39
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- 2a02:c79:fe00::/39
- 2a06:5901:8000::/40
- 2a06:5901:8100::/40
- 2a06:5901:8200::/40
- 2a06:5901:8300::/40
- 2a06:5901:8400::/40
- 2a06:5901:8500::/40
- 2620:10a:6000::/44
- 2620:115:e000::/44
- 2a00:83a0:2310::/44
- 2a0c:93c0:10::/44
- 2a0c:93c0::/44
- 2001:558:4000::/48
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- 2001:558:8000::/48
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Member clusters
- Comcast Cable Communications, LLC US-PA 4,449 netblocks
- Sky UK Limited GB 183 netblocks
- NBCUNIVERSAL INTERNATIONAL LIMITED 64 netblocks
- Sky Italia srl IT 31 netblocks
- Comcast International Holdings UK Limited 26 netblocks
- Sky Deutschland GmbH DE 5 netblocks
- NET-GB-NBCUniversal-International-Ltd 3 netblocks
- BRITISH-SKY-BROADCASTING-LTD GB 2 netblocks
- Versant Media Group, Inc. US-PA 2 netblocks
- NET-IT-NBCUniversal-International-Ltd 1 netblocks
Possibly related
Clusters that share this name but whose own registration doesn't confirm them as part of this corporate family — a different or unverified legal entity (a joint venture, a former subsidiary, or a namesake). Shown for context; not counted in the totals above.
- COMCAST INDIA ENGINEERING CENTER I LLP IN 5 netblocks
- Comcast-Palo-Alto US-PA 4 netblocks
- COMCAST-NBCU US-DE 3 netblocks
- Comcast-Boston US-PA 3 netblocks
- COMCAST-FREEWHEEL US-DE 3 netblocks
- Comcast IP Services, L.L.C. 2 netblocks
- COMCAST-GTT6 US-DE 2 netblocks
- COMCAST_SOFTWARE_SOLUTIONS IN 2 netblocks
- Comcast-NYC-NY9 1 netblocks
- COMCAST BUSINESS COMMUNIC 1 netblocks