asn.dev

Autonomous system

AS43866 ALTRON

Unclassified RIPE

IPv4 addresses 512 1 prefixes
IPv6 prefixes 0 counted as prefixes, not addresses
Countries 1 mostly CZ
Exchanges 0 recorded by PCH
Upstreams 2 0 downstream
Flagged prefixes 0 none

Summary

Altron a.s.

Czechia · AI-generated

business czech telecom

The AS handle ALTRON is held by Altron a.s.

What it's used for

  • The address space carries corporate infrastructure, indicated by the netname ALTRON_NET and registrant Altron a.s.
  • The inventory consists of 512 IPv4 addresses within a single /23 prefix (91.195.202.0/23) and 0 IPv6 prefixes, observed against 2 routing neighbours
  • As a Czech telecommunications and technology company, this space supports internal business operations, office connectivity, and service endpoints for its various industry verticals

Notable

  • The RDAP registrant Altron a.s. aligns directly with the AS holder and the netname ALTRON_NET
  • The address inventory is compact and singular, comprising one contiguous /23 block with no announced IPv6 space

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
AS5610O2 Czech Republic, a.s.71
AS39791Telco Pro Services, a. s.46

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-13, 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
CZCzechia1

Registry

Allocation record

RIPE · via Atlas (registry + RDAP)
Registry
RIPE
Handle
AS43866
Registry name
ALTRON
Registrant
AS5610-MTN
Abuse contact
abuse@o2.cz
Registered
2007-10-11
Last changed
2018-09-04
Allocation
allocated

Routing security

RPKI and IRR

Full detail
RPKI
100% valid · 2 valid, 0 with no ROA
ROAs
2 authorising AS43866
ASPA
no ASPA record
IRR
100% registered · 2 of 2 announcements
Route objects
1 naming AS43866

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: 440 networks and 1,773 prefixes, as published 2026-10-13. 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