asn.dev

Autonomous system

AS26421 PONDEROSA-INTERNET

Unclassified ARIN

IPv4 addresses 8.96K 13 prefixes
IPv6 prefixes 0 counted as prefixes, not addresses
Countries 1 mostly US
Exchanges 0 recorded by PCH
Upstreams 2 0 downstream
Flagged prefixes 0 none

Summary

Ponderosa Cablevision

United States of America · AI-generated

cable residential access us

The AS handle PONDEROSA-INTERNET is held by Ponderosa Cablevision.

What it's used for

  • The address space carries residential cable internet traffic, evidenced by reverse DNS records pointing to netptc.net (e.g., 23-29-11-254.netptc.net) and netnames like TWTC-PONDEROSA50 and SIERRATEL-4.
  • The AS announces 8960 IPv4 addresses across 13 prefixes with only 2 observed neighbours, a ratio that indicates an access or eyeball network rather than a transit provider.

Notable

  • Registrants are predominantly Ponderosa Cablevision, though two prefixes (209.150.76.0/23 and 209.234.206.0/23) are registered to Level 3 Parent, LLC, suggesting historical acquisition or leased space.
  • The inventory is dominated by a single large /20 block (23.29.0.0/20) alongside numerous smaller /23 and /24 blocks, reflecting a typical regional cable operator footprint.

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

2 upstream, 0 downstream and 2 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS54048Vast Networks660
AS3356Level 3 Parent, LLC345

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-18, 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 13 prefixes · 8.96K addresses IPv6 0 prefixes

CountryNamePrefixes
USUnited States of America13

Registry

Allocation record

ARIN · via Atlas (registry + RDAP)
Registry
ARIN
Handle
AS26421
Registry name
PONDEROSA-INTERNET
Registrant
Ponderosa Cablevision
Abuse contact
noc@netptc.net
Registered
2013-05-29
Last changed
2013-05-29
Allocation
assigned

Routing security

RPKI and IRR

Full detail
RPKI
100% valid · 15 valid, 0 with no ROA
ROAs
14 authorising AS26421
ASPA
no ASPA record
IRR
100% registered · 15 of 15 announcements
Route objects
16 naming AS26421

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 1,784 prefixes, as published 2026-10-19. 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