asn.dev

Autonomous system

AS42908 ORIGINAL AS CZ-NORDICTELECOMREGIONAL

Unclassified RIPE

IPv4 addresses 183K 35 prefixes
IPv6 prefixes 9 counted as prefixes, not addresses
Countries 1 mostly CZ
Exchanges 0 recorded by PCH
Upstreams 1 2 downstream
Flagged prefixes 0 none

Summary

O2 Czech Republic

Czechia · AI-generated

residential isp telecom czech

CZ-NORDICTELECOMREGIONAL is operated by O2 Czech Republic, a.s.

What it's used for

  • The address space carries residential and business subscriber traffic, evidenced by reverse DNS entries such as 213-19-32-0.rno.o2.cz and 78-136-144-0.rno.o2.cz.
  • The AS announces 183,296 IPv4 addresses across 35 prefixes and 9 IPv6 prefixes, while maintaining only 3 observed routing neighbours.
  • This high address-to-neighbour ratio indicates an access network providing connectivity to end-users rather than a transit provider.

Notable

  • All sampled registrants are listed as 5610-Tech-and-Admin; O2 Czech Republic, a.s., which aligns with the AS holder.
  • The address inventory consists of multiple large blocks, including /17 and /18 prefixes, reflecting a substantial legacy allocation.
  • The AS handle CZ-NORDICTELECOMREGIONAL references a former entity name, while the current operator is O2 Czech Republic, a major telecommunications provider in the country.

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

ASNetworkPaths seen
AS5610O2 Czech Republic, a.s.2,397

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 35 prefixes · 183K addresses IPv6 9 prefixes

CountryNamePrefixes
CZCzechia44

Registry

Allocation record

RIPE · via Atlas (registry + RDAP)
Registry
RIPE
Handle
AS42908
Registry name
CZ-NORDICTELECOMREGIONAL
Registrant
AS5610-MTN
Abuse contact
abuse@o2.cz
Registered
2007-05-09
Last changed
2025-04-01
Allocation
allocated

Routing security

RPKI and IRR

Full detail
RPKI
100% valid · 44 valid, 0 with no ROA
ROAs
44 authorising AS42908
ASPA
no ASPA record
IRR
100% registered · 44 of 44 announcements
Route objects
44 naming AS42908

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 1,773 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