asn.dev

Autonomous system

AS28509 Cablemas Telecomunicaciones SA de CV

Unclassified ARIN

IPv4 addresses 290K 189 prefixes
IPv6 prefixes 105 counted as prefixes, not addresses
Countries 1 mostly MX
Exchanges 0 recorded by PCH
Upstreams 5 1 downstream
Flagged prefixes 0 none

Summary

izzi

Mexico · AI-generated

residential isp cable dsl

AS28509 is operated by Cablemas Telecomunicaciones SA de CV, the corporate entity behind the izzi consumer brand.

What it's used for

  • The address space carries residential customer traffic, evidenced by reverse DNS entries such as 189.220.168.0-customer-chihuahua-izzi-mx and 189.220.175.255-customer-chihuahua-izzi-mx.
  • The network announces 288,512 IPv4 addresses across 187 prefixes and 102 IPv6 prefixes, while maintaining only 7 observed neighbours, a ratio characteristic of an access or eyeball network rather than a transit provider.

Notable

  • All available RDAP registrants for the largest prefixes are listed as Cablemas Telecomunicaciones SA de CV, aligning perfectly with the AS holder.
  • The operator is widely known as izzi, a major Mexican cable and DSL provider, with the registry name reflecting its corporate legal structure.
  • The inventory consists of a large block of /18 and /19 prefixes alongside numerous /20s, indicating a substantial and finely subdivided address estate.

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

Full topology · Graph

Internet exchanges

No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.

Transit providers

5 upstream, 1 downstream and 12 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS18734Operbes, S.A. de C.V.12,981
AS174Cogent Communications, LLC5,637
AS6762TELECOM ITALIA SPARKLE S.p.A.2,817
AS32098Transtelco Inc2,484
AS28545Cablemas Telecomunicaciones SA de CV1,334

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

Shape and geography

IPv4 189 prefixes · 290K addresses IPv6 105 prefixes

CountryNamePrefixes
MXMexico294

Registry

Allocation record

ARIN · via Atlas (registry + RDAP)
Registry
ARIN
Handle
AS28509
Registry name
28509
Registrant
Cablemas Telecomunicaciones SA de CV
Abuse contact
ipmastercm@izzi.mx
Registered
2005-04-25
Last changed
2021-09-14
Allocation
allocated

Routing security

RPKI and IRR

Full detail
RPKI
67% valid · 320 valid, 159 with no ROA
ROAs
111 authorising AS28509
ASPA
no ASPA record
IRR
100% registered · 479 of 479 announcements
Route objects
806 naming AS28509

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 1,773 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

Cross-check