Autonomous system
AS25248 BLUETONE-AS The Czech Republic
Unclassified RIPE NSP
Summary
Radiokomunikace a.s.
residential isp czech static
BLUETONE-AS is operated by Radiokomunikace a.s., a Czech telecommunications provider.
What it's used for
- The address space carries static residential and business connections, evidenced by reverse DNS entries such as
static.bluetone.czandmail.topmodern.cz. - With 106,752 IPv4 addresses announced across 5 prefixes and 62 observed neighbours, the ratio indicates an access network providing connectivity to end-users rather than a transit provider.
Notable
- Registrants for the majority of prefixes are listed as
CRA Hostmasters; RADIOKOMUNIKACE a.s., aligning with the AS holder, while one /24 block is registered toMesto Jicin. - The inventory consists of five distinct IPv4 blocks, including a /16 and two /18s, alongside two IPv6 prefixes, reflecting a standard regional ISP footprint.
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
Internet exchanges
Recorded at 4 exchanges in 3 countries, largest first.
| Exchange | Location | Their address |
|---|---|---|
| Peering.cz | Prague, Czech Republic | 185.0.20.132 |
| NIX.CZ - Neutral Internet eXchange for the Czech Republic | Prague, Czech Republic | 91.210.16.205 |
| Vienna Internet Exchange | Vienna, Austria | 2001:7f8:30:0:2:1:3:1230 |
| Slovak Internet eXchange Bratislava | Bratislava, Slovakia | 192.108.148.65 |
Transit providers
7 upstream, 27 downstream and 53 adjacent networks observed; most-used upstreams first.
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-16, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 5 prefixes · 107K addresses IPv6 2 prefixes
| Country | Name | Prefixes |
|---|---|---|
| CZ | Czechia | 7 |
Registry
Allocation record
- Registry
- RIPE
- Handle
AS25248- Registry name
- BlueTone-AS
- Registrant
- BlueTone-MNT
- Abuse contact
- abuse@bluetone.cz
- Registered
- 2002-09-20
- Last changed
- 2026-09-02
- Allocation
- allocated
Declared
PeeringDB profile
- Name
- Radiokomunikace
- Also known as
- Ceske Radiokomunikace a.s.
- Network type
- NSP
- Scope
- Regional
- Peering policy
- Open
- IRR as-set
AS-CRA- Present at
- 3 exchanges
- Facilities
- 3 facilities
- Website
- https://www.cra.cz
PeeringDB records are maintained by the network operator and are not independently verified. Treat them as a statement of intent rather than of fact. For the observed and recorded view, see peering, which lists the exchanges Packet Clearing House has a port on file for.
Routing security
RPKI and IRR
- RPKI
- 71% valid · 5 valid, 2 with no ROA
- ROAs
- 7 authorising AS25248
- ASPA
- no ASPA record
- IRR
- 100% registered · 7 of 7 announcements
- Route objects
- 7 naming AS25248
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 2026-10-17. 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