Autonomous system
AS33588 BRESNAN-33588
Unclassified ARIN
Summary
Charter Communications
residential cable broadband spectrum
The AS handle BRESNAN-33588 is held by Charter Communications LLC.
What it's used for
- The address space carries residential and business broadband traffic, evidenced by reverse DNS entries such as
syn-069-144-128-000.biz.spectrum.comandsyn-072-174-128-000.res.spectrum.com. - With 841984 IPv4 addresses announced against only 14 observed neighbours, the ratio indicates a large-scale access or eyeball network rather than a transit provider.
Notable
- All registrants for the largest prefixes, including
NET-CORE-BB-1andCC04, are listed as Charter Communications LLC, matching the announcer. - The AS handle retains the name "BRESNAN" because Charter acquired Bresnan Communications in 2010, which was previously owned by Cablevision and rebranded as Optimum West before the divestiture.
- The inventory consists of 36 IPv4 prefixes and 13 IPv6 prefixes, with the largest blocks being /15s such as 69.144.0.0/15 and 72.174.0.0/15.
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 2026-10-14, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 36 prefixes · 842K addresses IPv6 13 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 49 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS33588- Registry name
- BRESNAN-33588
- Registrant
- Charter Communications LLC
- Abuse contact
- abuse@charter.net
- Registered
- 2005-01-27
- Last changed
- 2018-11-20
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 100% valid · 52 valid, 0 with no ROA
- ROAs
- 69 authorising AS33588
- ASPA
- no ASPA record
- IRR
- 75% registered · 39 of 52 announcements
- Route objects
- 54 naming AS33588
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: 442 networks and 1,772 prefixes, as published 2026-10-15. 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