asn.dev

Autonomous system

AS42923 PLK-AS PLK AS Number

Unclassified RIPE

IPv4 addresses 1.28K 2 prefixes
IPv6 prefixes 0 counted as prefixes, not addresses
Countries 1 mostly PL
Exchanges 0 recorded by PCH
Upstreams 2 0 downstream
Flagged prefixes 0 none

Summary

PKP Polskie Linie Kolejowe S.A.

Poland · AI-generated

government railway infrastructure business

PLK-AS is held by PKP Polskie Linie Kolejowe S.A., the Polish national railway infrastructure manager.

What it's used for

  • The address space carries internal corporate and infrastructure traffic, evidenced by reverse DNS entries such as 217-79-146-254.static.ip.netia.com.pl and 88-199-162-64.tktelekom.pl.
  • The AS announces 1280 IPv4 addresses across 2 prefixes with 3 observed neighbours, a ratio consistent with a small, self-contained internal network rather than a transit or large access provider.
  • Traffic from this AS represents the operational and administrative network of Poland's railway infrastructure manager, supporting internal systems and site connectivity.

Notable

  • Registrants differ from the announcer: 217.79.144.0/22 is registered to Powszechna Agencja Informacyjna S.A. (netname PL-PAGI-20031112), while 88.199.162.0/24 is registered to TKTelekom's Abuse Team (netname PL-PLKSA).
  • The address inventory is small and finely subdivided, typical of an internal corporate estate with site-by-site segmentation.

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
AS20804Exatel S.A.156
AS12741Netia SA21

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 2 prefixes · 1.28K addresses IPv6 0 prefixes

CountryNamePrefixes
PLPoland2

Registry

Allocation record

RIPE · via Atlas (registry + RDAP)
Registry
RIPE
Handle
AS42923
Registry name
PLK-AS
Registrant
AS42923-MNT
Abuse contact
abuse@tktelekom.pl
Registered
2007-05-10
Last changed
2019-05-22
Allocation
allocated

Routing security

RPKI and IRR

Full detail
RPKI
100% valid · 3 valid, 0 with no ROA
ROAs
3 authorising AS42923
ASPA
no ASPA record
IRR
100% registered · 3 of 3 announcements
Route objects
4 naming AS42923

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