asn.dev

Autonomous system

AS51291 ISTOK-AS

Unclassified APNIC

IPv4 addresses 1.02K 1 prefixes
IPv6 prefixes 0 counted as prefixes, not addresses
Countries 1 mostly RU
Exchanges 0 recorded by PCH
Upstreams 2 0 downstream
Flagged prefixes 0 none

Summary

Istok Ltd.

Russian Federation · AI-generated

business russia small

The AS handle ISTOK-AS is held by Istok Ltd.

What it's used for

  • The address space carries corporate infrastructure, evidenced by the netname ISTOK-NET and reverse DNS entries pointing to the domain istokk.ru, such as 25kadr-g51.istokk.ru.
  • The network announces 1024 IPv4 addresses across a single prefix (91.218.128.0/22) and has one observed neighbour, indicating a small, self-contained corporate estate rather than a transit or access provider.
  • Traffic from this AS consists of internal corporate endpoints and office workers, consistent with the holder's identity as a limited liability company.

Notable

  • The registrant Istok Ltd. matches the AS holder, with the netname ISTOK-NET confirming the alignment between the routing announcement and the registry data.
  • The address inventory is a single contiguous /22 block, which is typical for a small business or internal corporate network that does not require complex segmentation or large-scale address allocation.

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
AS50928PJSC MegaFon38
AS8359MTS PJSC22

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-19, 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 1 prefixes · 1.02K addresses IPv6 0 prefixes

CountryNamePrefixes
RURussian Federation1

Registry

Allocation record

APNIC · via Atlas (registry + RDAP)
Registry
APNIC
Handle
AS51291
Registry name
ISTOK-AS
Registrant
MNT-ISTOK
Abuse contact
abuse@istokk.ru
Registered
2010-07-15
Last changed
2021-02-19
Allocation
allocated

Routing security

RPKI and IRR

Full detail
RPKI
0% valid · 0 valid, 1 with no ROA
ROAs
0 authorising AS51291
ASPA
no ASPA record
IRR
100% registered · 1 of 1 announcements
Route objects
1 naming AS51291

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 1,783 prefixes, as published 2026-10-20. 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