asn.dev

Autonomous system

AS56658 ISI-AS

Unclassified RIPE

IPv4 addresses 512 1 prefixes
IPv6 prefixes 0 counted as prefixes, not addresses
Countries 1 mostly PL
Exchanges 0 recorded by PCH
Upstreams 1 0 downstream
Flagged prefixes 0 none

Summary

ISI Sp. z o.o.

Poland · AI-generated

isp residential mobile poland

ISI-AS is operated by ISI Sp. z o.o.

What it's used for

  • The address space carries consumer internet, television, and mobile services, as indicated by the netname ISI-NET and the operator's business description.
  • The AS announces 512 IPv4 addresses within a single prefix (91.226.110.0/23) and maintains 1 observed neighbour, a ratio characteristic of an access network.
  • Traffic from this AS consists of subscriber eyeballs and mobile data for residential and small business customers in Poland.

Notable

  • The RDAP registrant ISI Sp. z o.o. matches the AS holder name.
  • The address inventory is compact, consisting of a single /23 block with no announced IPv6 prefixes.

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

1 upstream, 0 downstream and 1 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS24723Atman Sp. z o.o.59

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 1 prefixes · 512 addresses IPv6 0 prefixes

CountryNamePrefixes
PLPoland1

Registry

Allocation record

RIPE · via Atlas (registry + RDAP)
Registry
RIPE
Handle
AS56658
Registry name
ISI-AS
Registrant
ATMAN-MNT
Abuse contact
isi-net@wp.pl
Registered
2011-04-20
Last changed
2026-01-13
Allocation
allocated

Routing security

RPKI and IRR

Full detail
RPKI
0% valid · 0 valid, 1 with no ROA
ROAs
0 authorising AS56658
ASPA
no ASPA record
IRR
100% registered · 1 of 1 announcements
Route objects
2 naming AS56658

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 1,771 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

Cross-check