AS7725 — COMCAST-7725

AS7725 announces 263 IPv4 prefixes covering 1,466,624 addresses and 131 IPv6 prefixes.

About this network

COMCAST-7725 is one of Comcast's secondary ASNs, registered to Comcast Cable Communications, LLC of Mt Laurel, New Jersey. Despite the famous name, it is not the Comcast residential eyeball network.

What it's used for

• It originates a few dozen scattered /22–/24 routes on behalf of Comcast Business dedicated-internet customers — enterprise sites that hold their own address space and have Comcast announce it for them.
• Sampling the ARIN registrations behind those prefixes turns up unrelated third-party organisations: a hospital, a state technical-college system, an industrial software vendor, an agribusiness, and several private companies. Only a handful of the prefixes are registered to Comcast itself, under Comcast Business netnames.
• There is essentially no reverse DNS across the space. Comcast's actual subscriber network is blanketed in c-IP-ADDR.hsd1.STATE.comcast.net names; none of that appears here.

Notable

• Do not treat this as consumer broadband address space. The residential eyeball network is AS7922; Comcast Business runs separately on AS7016. AS7725 is a third thing again: a routing vehicle for customer-held prefixes.
• Because the prefixes belong to distinct end-customer organisations rather than to Comcast, they should not be geolocated to Comcast or to a single Comcast market. Each one lands wherever that customer's site is.
• PeeringDB lists the network as "Comcast - Atlanta" and types it as Cable/DSL/ISP. The announced inventory does not support that reading, and the inventory is the more reliable witness.

Interesting

• ARIN registered the ASN on 1996-12-20, in the era when Comcast was still assembling its online business. The number survived every subsequent merger and rebrand while being quietly repurposed for enterprise customer routes.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.

Announced prefixes

• 23.30.200.0/22
• 23.31.128.0/19
• 24.30.0.0/17
• 24.98.0.0/15
• 24.104.42.0/24
• 24.104.125.0/24
• 24.124.169.0/24
• 24.125.0.0/16
• 24.126.128.0/17
• 24.131.32.0/19
• 24.153.69.0/24
• 50.73.64.0/19
• 50.76.152.0/21
• 50.76.224.0/21
• 50.79.128.0/21
• 50.79.224.0/20
• 50.176.0.0/18
• 50.184.0.0/18
• 50.185.56.0/21
• 50.192.32.0/19
• 50.193.244.0/23
• 50.194.224.0/19
• 50.197.225.0/24
• 50.199.96.0/19
• 50.200.84.0/24
• 50.200.228.0/24
• 50.201.173.0/24
• 50.201.206.0/24
• 50.201.221.0/24
• 50.204.42.0/24
• 50.204.249.0/24
• 50.205.36.0/23
• 50.205.240.0/24
• 50.207.4.0/24
• 50.215.224.0/19
• 50.220.99.0/24
• 50.220.236.0/24
• 50.224.48.0/23
• 50.225.207.0/24
• 50.232.28.0/24
• 50.233.190.0/24
• 50.234.27.0/24
• 50.235.151.0/24
• 50.238.8.0/24
• 50.241.0.0/19
• 50.243.192.0/19
• 50.245.80.0/22
• 50.246.0.0/19
• 50.247.40.0/21
• 50.248.224.0/19
• 50.251.128.0/18
• 50.254.216.0/22
• 64.139.64.0/23
• 64.139.78.0/24
• 64.139.94.0/23
• 66.56.0.0/18
• 66.208.195.0/24
• 66.208.244.0/23
• 67.166.192.0/18
• 67.191.128.0/17
• 68.32.112.0/20
• 68.32.160.0/20
• 68.34.128.0/20
• 68.34.224.0/20
• 68.35.0.0/17
• 68.35.128.0/18
• 68.42.32.0/20
• 68.46.192.0/20
• 68.54.160.0/20
• 68.60.208.0/20
• 68.62.112.0/20
• 68.62.128.0/19
• 68.62.160.0/20
• 68.62.208.0/20
• 68.62.224.0/19
• 68.63.80.0/20
• 68.63.96.0/19
• 68.63.128.0/19
• 68.63.176.0/20
• 68.63.192.0/20
• 68.63.224.0/20
• 68.85.10.0/23
• 68.85.32.0/23
• 68.85.36.0/24
• 68.85.68.0/24
• 68.85.90.0/23
• 68.85.92.0/24
• 68.85.108.0/22
• 68.85.121.0/24
• 68.85.172.0/23
• 68.85.197.0/24
• 68.85.205.0/24
• 68.85.227.0/24
• 68.85.232.0/23
• 68.86.16.0/23
• 68.86.41.0/24
• 68.86.106.0/23
• 68.86.108.0/22
• 68.87.68.0/24
• 68.87.244.0/24

and 294 more.

Upstream networks

• AS7922 Comcast Cable Communications, LLC
• AS3356 Level 3 Parent, LLC

Downstream networks

• AS14725 Crawford & Company
• AS13433 Cox Enterprises Inc
• AS53984 Wellstar Health System
• AS13768 Aptum Technologies
• AS393385 National Vision, Inc.
• AS21938 YAMAHA MOTOR CORPORATION, U.S.A
• AS40724 DeKalb County, Georgia
• AS12211 Operations & Compliance Network LLC
• AS33741 Dennis Group
• AS396019 Comcast Cable Communications, LLC
• AS22304 City of Marietta
• AS395420 JAS Worldwide Management, Inc.
• AS26883 Morehouse College
• AS394549 GEMA/HS
• AS4503 Grady Memorial Hospital
• AS14934 AGS
• AS21784 The Robert W. Woodruff Library of the Atlanta University Center, Inc.
• AS401422 Cobb County Government
• AS393567 Atlanticus Holdings Corporation
• AS40072 Technical College System of Georgia
• AS22768 SYNERGY BROADBAND
• AS25633 DATAMATX INC
• AS19155 Vystar Credit Union
• AS40057 Georgia Aquarium, INC.
• AS41437 KNAPP AG

Adjacent networks

• AS7922 Comcast Cable Communications, LLC
• AS3356 Level 3 Parent, LLC
• AS14725 Crawford & Company
• AS13433 Cox Enterprises Inc
• AS53984 Wellstar Health System
• AS13768 Aptum Technologies
• AS393385 National Vision, Inc.
• AS21938 YAMAHA MOTOR CORPORATION, U.S.A
• AS40724 DeKalb County, Georgia
• AS12211 Operations & Compliance Network LLC
• AS33741 Dennis Group
• AS396019 Comcast Cable Communications, LLC
• AS22304 City of Marietta
• AS395420 JAS Worldwide Management, Inc.
• AS26883 Morehouse College
• AS394549 GEMA/HS
• AS14934 AGS
• AS393567 Atlanticus Holdings Corporation
• AS401422 Cobb County Government
• AS4503 Grady Memorial Hospital
• AS21784 The Robert W. Woodruff Library of the Atlanta University Center, Inc.
• AS40072 Technical College System of Georgia
• AS22768 SYNERGY BROADBAND
• AS25633 DATAMATX INC
• AS19155 Vystar Credit Union