asn.dev

Autonomous system

AS51004 SCTS-AS

Unclassified RIPE

IPv4 addresses 17.41K 28 prefixes
IPv6 prefixes 1 counted as prefixes, not addresses
Countries 1 mostly RU
Exchanges 0 recorded by PCH
Upstreams 2 2 downstream
Flagged prefixes 0 none

Summary

Sakhalin Cable Telesystems

Russian Federation · AI-generated

isp residential cable sakhalin

SCTS-AS is operated by Sakhalin Cable Telesystems Ltd.

What it's used for

  • The address space carries residential cable subscriber traffic, evidenced by reverse DNS names such as ip-188-113-155-254.z27.ysk.scts.tv and broadcast.z23.ysk.scts.tv, with ysk indicating Yuzhno-Sakhalinsk.
  • The AS announces 17,408 IPv4 addresses across 28 prefixes and 1 IPv6 prefix, while maintaining only 5 observed neighbours, a ratio characteristic of an access network rather than a transit provider.
  • Traffic consists of subscriber eyeballs for cable television and internet services in the Sakhalin region, consistent with the operator's business as a regional cable television system.

Notable

  • All registrants in the RDAP data are Sakhalin Cable Telesystems Ltd, matching the AS holder and confirming a single-organisation estate.
  • The inventory is finely subdivided into /22, /23, and /24 blocks, reflecting site-by-site segmentation typical of a regional cable operator managing distinct headend or node locations.

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, 2 downstream and 5 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS12389PJSC Rostelecom1,966
AS20485Joint Stock Company TransTeleCom337

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-30, 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 28 prefixes · 17.41K addresses IPv6 1 prefixes

CountryNamePrefixes
RURussian Federation29

Registry

Allocation record

RIPE · via Atlas (registry + RDAP)
Registry
RIPE
Handle
AS51004
Registry name
SCTS-AS
Registrant
Sakhalin Cable Telesystems Ltd
Abuse contact
scts.sakh@gmail.com
Registered
2010-05-14
Last changed
2018-09-04
Allocation
allocated

Routing security

RPKI and IRR

Full detail
RPKI
0% valid · 0 valid, 37 with no ROA
ROAs
0 authorising AS51004
ASPA
no ASPA record
IRR
100% registered · 37 of 37 announcements
Route objects
71 naming AS51004

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: 447 networks and 1,849 prefixes, as published 2026-10-30. 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