Autonomous system
AS7725 COMCAST-7725
Unclassified ARIN
Summary
Comcast Cable Communications
business enterprise legacy
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–/24routes 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.netnames; 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. Source, and how to suggest an edit.
Interconnection
Peering at a glance
Internet exchanges
No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-13, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 263 prefixes · 1.47M addresses IPv6 131 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 394 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS7725- Registry name
- COMCAST-7725
- Registrant
- Comcast Cable Communications, LLC
- Abuse contact
- abuse@comcast.net
- Registered
- 1996-12-20
- Last changed
- 2021-01-25
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 94% valid · 137 valid, 8 with no ROA
- ROAs
- 3,387 authorising AS7725
- ASPA
- no ASPA record
- IRR
- 79% registered · 115 of 145 announcements 4 other origin
- Route objects
- 258 naming AS7725
Reputation
Classification and threat
Unclassified Not in the curated lists. Most of the ~80,000 allocated ASNs are not.
Spamhaus DROP
Not on ASN-DROP The network as a whole is not listed.
No DROP prefixes None of its announced space is on the DROP prefix list.
Spamhaus DROP ("Don't Route Or Peer") lists space and networks run by, or hijacked for, spam and cybercrime operations: 436 networks and 1,771 prefixes, as published 2026-10-13. A short, high-confidence list, so a match is worth taking seriously, and absence from it says little on its own.
FBI IC3
No IC3 indicators Nothing from the FBI IC3 feed.
IC3 threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.
Elsewhere