COMCAST CORPORATION

Comcast Cable Communications, LLC
Data as of 2026-08-09
GLEIF verified
Complete entity footprint
5 linked clusters · 4,555 netblocks · 79,249,717 IPv4 addresses · 3,184 IPv6 prefixes
This organisation's clusters combined by evidence — shared GLEIF corporate family and shared operating domain comcast.net — not name similarity, so genuinely different organisations that share a name are excluded.
View the full entity page →
LEI
51M0QTTNCGUN7KFCFZ59
Registered name
COMCAST CORPORATION
Jurisdiction
US-PA
Ultimate parent
No parent on file in GLEIF
Cluster stats
Netblocks4,376 · 70,808,624 IPv4 addresses
IPv6 3,137 prefixes (largest 2601::/20)
Registered in United States (1,225) · Canada (10) · MD (8) · Japan (5) · Ukraine (4) · Hungary (2)
All fragments 4,451 blocks across 15 clusters
Cluster ID217928685
RegistryBGP
Owner jurisdictionUS-PA
Customersfind customers using this network →
Evidence & provenance ?
Attribution GLEIF legal-entity match
Legal identityLEI 51M0QTTNCGUN7KFCFZ59
Shared handles clustered on 100 shared RIR contact/maintainer handles
Registry names 14 distinct registrant names across these blocks
full provenance (JSON) → · how attribution works · report an issue

Footprint over time

7 weekly snapshots · JSON
4,399 +341 netblocks since 2026-07-05
2026-07-05 peak 4,399 2026-08-09

IP Ranges (4,376)

showing 50 of 4,376 — see all — ⬇ export CSV (free export limited to 500 rows — subscribe for the full export)
CIDR Org name Registry Status Confidence
5.182.186.0/24 Comcast Cable Communications, LLC BGP ANNOUNCED ● high
5.182.187.0/24 Comcast Cable Communications, LLC BGP ANNOUNCED ● high
5.182.192.0/24 Comcast Cable Communications, LLC BGP ANNOUNCED ● high
5.182.193.0/24 Comcast Cable Communications, LLC BGP ANNOUNCED ● high
5.182.194.0/24 Comcast Cable Communications, LLC BGP ANNOUNCED ● high
5.182.195.0/24 Comcast Cable Communications, LLC BGP ANNOUNCED ● high
5.182.198.0/24 Comcast Cable Communications, LLC BGP ANNOUNCED ● high
9.142.48.0/20 Comcast Cable Communications, LLC BGP ANNOUNCED ● high
9.142.96.0/19 Comcast Cable Communications, LLC BGP ANNOUNCED ● high
9.142.118.0/23 Comcast Cable Communications, LLC BGP ANNOUNCED ● high
23.249.160.0/24 Comcast Cable Communications, LLC BGP ANNOUNCED ● high
23.249.170.0/24 Comcast Cable Communications, LLC BGP ANNOUNCED ● high
24.0.0.0/16 Comcast Cable Communications, Inc. ARIN ASSIGNMENT ● high
24.16.0.0/14 Comcast Cable Communications ARIN ASSIGNMENT ● high
24.30.0.0/18 Comcast Cable Communications Holdings, Inc ARIN ASSIGNMENT ● high
24.34.0.0/17 Comcast Cable Communications Holdings, Inc ARIN ASSIGNMENT ● high
24.60.0.0/15 Comcast Cable Communications Holdings, Inc ARIN ASSIGNMENT ● high
24.75.216.0/22 Comcast Cable Communications, LLC BGP ANNOUNCED ● high
24.91.0.0/17 Comcast Cable Communications Holdings, Inc ARIN ASSIGNMENT ● high
24.98.0.0/16 Comcast Cable Communications Holdings, Inc ARIN ASSIGNMENT ● high
24.104.46.0/24 Comcast Cable Communications, LLC BGP ANNOUNCED ● high
24.104.58.0/24 Comcast Cable Communications, LLC BGP ANNOUNCED ● high
24.104.72.0/24 Comcast Cable Communications, LLC BGP ANNOUNCED ● high
24.104.73.0/24 Comcast Cable Communications, LLC BGP ANNOUNCED ● high
24.104.75.0/24 Comcast Cable Communications, LLC BGP ANNOUNCED ● high
24.104.124.0/24 Comcast Cable Communications, LLC BGP ANNOUNCED ● high
24.104.138.0/23 Comcast Cable Communications, LLC BGP ANNOUNCED ● high
24.104.143.0/24 Comcast Cable Communications, LLC BGP ANNOUNCED ● high
24.104.146.0/24 Comcast Cable Communications, LLC BGP ANNOUNCED ● high
24.104.150.0/24 Comcast Cable Communications, LLC BGP ANNOUNCED ● high
24.104.156.0/24 Comcast Cable Communications, LLC BGP ANNOUNCED ● high
24.118.0.0/17 Comcast Cable Communications Holdings, Inc ARIN ASSIGNMENT ● high
24.124.128.0/17 Comcast Cable Communications, LLC ARIN ASSIGNMENT ● high
24.125.0.0/17 Comcast Cable Communications, LLC ARIN ASSIGNMENT ● high
24.126.0.0/17 Comcast Cable Communications Holdings, Inc ARIN ASSIGNMENT ● high
24.128.0.0/17 Comcast Cable Communications, LLC ARIN ASSIGNMENT ● high
24.129.0.0/18 Comcast Cable Communications, LLC ARIN ASSIGNMENT ● high
24.130.0.0/16 Comcast Cable Communications Holdings, Inc ARIN ASSIGNMENT ● high
24.147.0.0/17 Comcast Cable Communications Holdings, Inc ARIN ASSIGNMENT ● high
24.153.64.0/19 Comcast Cable Communications, LLC ARIN ASSIGNMENT ● high
24.218.0.0/17 Comcast Cable Communications Holdings, Inc ARIN ASSIGNMENT ● high
24.245.0.0/19 Comcast Cable Communications Holdings, Inc ARIN ASSIGNMENT ● high
31.132.52.0/24 Comcast Cable Communications, LLC BGP ANNOUNCED ● high
31.132.53.0/24 Comcast Cable Communications, LLC BGP ANNOUNCED ● high
31.132.54.0/23 Comcast Cable Communications, LLC BGP ANNOUNCED ● high
36.255.213.0/24 Comcast Cable Communications, LLC BGP ANNOUNCED ● high
36.255.214.0/24 Comcast Cable Communications, LLC BGP ANNOUNCED ● high
36.255.215.0/24 Comcast Cable Communications, LLC BGP ANNOUNCED ● high
45.58.210.0/23 Comcast Cable Communications, LLC BGP ANNOUNCED ● high
45.58.244.0/24 Comcast Cable Communications, LLC BGP ANNOUNCED ● high

IPv6 ranges (3,137)

showing the 15 largest allocations
CIDR
2601::/20
2603:2000::/20
2603:3000::/24
2001:558::/29
2a0c:1900::/29
2620:10a:6000::/44
2001:558:4000::/48
2001:558:4001::/48
2001:558:4002::/48
2001:558:4003::/48
2001:558:4010::/48
2001:558:4011::/48
2001:558:4012::/48
2001:558:4013::/48
2001:558:4020::/48

Domains hosted in this network

what's this?
comcast.net xfinity.com comcast.com xumo.com xcal.tv xfinityhome.com deap.tv masergy.com nnracing.com ident.com oldtownhome.com

Customer-delegated space

how is this classified?
Unclassified 4,341 (99.2%)
Customer access pools 58 (1.3%)

Corporate group (4 confirmed entities)

+47 additional unconfirmed candidates not shown — full list (JSON)

Network trust

what's this?
RPKI hygiene: B how networks compare →
92.2% of checked blocks have valid RPKI ROA coverage (1,845 of 2,000, sampled from 4,399)
Wholesale/transit re-announcements (95)

These blocks are registered to Comcast Cable Communications, LLC but cryptographically authorized across 16 different networks — typical for a large wholesale or transit carrier whose address space is substantially re-announced by downstream customers under their own ASNs, not individually noteworthy.

2a00:2381:10e0::/48 /48 authorized for AS2856 — British Telecommunications Limited
140.233.224.0/19 /19 authorized for AS3320 — Deutsche Telekom AG
48.44.72.0/21 /21 authorized for AS6079 — RCN
48.44.192.0/21 /21 authorized for AS6079 — RCN
193.31.104.0/22 /22 authorized for AS399130 — Ispwifi
195.211.116.0/22 /22 authorized for AS7018 — AT&T Enterprises, LLC
107.166.24.0/22 /22 authorized for AS7018 — AT&T Enterprises, LLC
107.166.28.0/22 /22 authorized for AS7018 — AT&T Enterprises, LLC
107.166.96.0/22 /22 authorized for AS7018 — AT&T Enterprises, LLC
107.166.100.0/22 /22 authorized for AS7018 — AT&T Enterprises, LLC
107.166.104.0/22 /22 authorized for AS7018 — AT&T Enterprises, LLC
107.166.108.0/22 /22 authorized for AS7018 — AT&T Enterprises, LLC
185.188.192.0/22 /22 authorized for AS7018 — AT&T Enterprises, LLC
195.138.124.0/22 /22 authorized for AS3257 — GTT Communications Inc.
216.122.124.0/22 /22 authorized for AS834 — IPXO LLC
+80 more — see the REST API

NIC Handles

ABOVENET-MNT AS13367 AS14042 AS20214 AS21508 AS22258 AS22909 AS3257-IPAM-MNT AS33287 AS33489 AS33490 AS33491 +88 more