ASN Lookup Tool

Cortex, a.s. cortex.cz CZ CZ 2 Routes

AS Data

AS204394

AS204394Cortex, a.s.

AS Number 204394
AS Name CORTEX
Organization Cortex, a.s. (org-ca1874-ripe)
Country CZ
Website cortex.cz
Number of IPv4 Routes 1
Number of IPv6 Routes 1
ASN type BUSINESS
Allocation Status ASSIGNED
Registry RIPE
Date Allocated 2018-03-20

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Use ASN data for AS204394 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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IP Ranges

Route # IPs
185.250.100.0/22 1024
2a0e:e580::/29 ~634×10²⁷

Raw Whois Response

% This is the RIPE Database query service.
% The objects are in RPSL format.
%
% The RIPE Database is subject to Terms and Conditions.
% See https://docs.db.ripe.net/terms-conditions.html

% Note: this output has been filtered.
%       To receive output for a database update, use the "-B" flag.

% Information related to 'AS203940 - AS205662'

as-block:       AS203940 - AS205662
descr:          RIPE NCC ASN block
remarks:        These AS Numbers are assigned to network operators in the RIPE NCC service region.
mnt-by:         RIPE-NCC-HM-MNT
created:        2026-03-05T15:29:31Z
last-modified:  2026-03-05T15:29:31Z
source:         RIPE

% Information related to 'AS204394'

% Abuse contact for 'AS204394' is 'abuse@cortex.cz'

aut-num:        AS204394
as-name:        CORTEX
org:            ORG-CA1874-RIPE
import:         from AS5588 accept ANY
export:         to AS5588 announce AS204394
import:         from AS16019 accept ANY
export:         to AS16019 announce AS204394
admin-c:        MV80-RIPE
tech-c:         MV80-RIPE
status:         ASSIGNED
mnt-by:         RIPE-NCC-END-MNT
mnt-by:         cz-cortex-1-mnt
created:        2018-03-20T08:41:33Z
last-modified:  2020-08-17T12:58:05Z
source:         RIPE

organisation:   ORG-CA1874-RIPE
org-name:       Cortex, a.s.
country:        CZ
reg-nr:         47125616
org-type:       LIR
address:        U Elektry 974/1c
address:        19000
address:        Prague
address:        CZECH REPUBLIC
phone:          +420266610466
admin-c:        MV13462-RIPE
tech-c:         MV13462-RIPE
abuse-c:        AR45584-RIPE
mnt-ref:        cz-cortex-1-mnt
mnt-by:         RIPE-NCC-HM-MNT
mnt-by:         cz-cortex-1-mnt
created:        2018-03-19T07:24:18Z
last-modified:  2026-05-13T07:10:44Z
source:         RIPE # Filtered

person:         Martin Valasek
address:        Slovakia
phone:          +421 907 133135
nic-hdl:        MV80-RIPE
mnt-by:         MNT-CORTEX
created:        2001-10-05T19:20:50Z
last-modified:  2011-05-12T11:52:16Z
source:         RIPE # Filtered
remarks:        http://martinko.eu.org

% This query was served by the RIPE Database Query Service version 1.123 (DEXTER)

Parsed Whois Response

Peers

AS Number Description Country
AS199081 Lancom Ltd. GR
AS24482 SG.GS SG
AS12741 Netia SA PL
AS40994 Hohl IT e.U. AT
AS6881 NIX.CZ z.s.p.o. CZ
AS6855 Slovak Telekom, a.s. SK
AS1764 Next Layer Telekommunikationsdienstleistungs und Beratungs GmbH AT
AS60602 Inovare-Prim SRL MD
AS6939 Hurricane Electric LLC US
AS6204 ZET.NET IP Transit RO
AS51184 Fonira Telekom GmbH AT
AS22356 Durand do Brasil Ltda BR
AS6663 Euroweb Romania S.R.L. RO
AS212483 LEVEL EIGHTY-SIX COMMUNICATIONS LTD GB
AS198150 SIACOM JSC GE
AS33891 Core Backbone GmbH DE
AS57344 Telehouse EAD BG
AS9498 Bharti Airtel Ltd IN
AS49544 i3Dnet i3D.net B.V NL
AS36236 NetActuate, Inc US
AS4455 IX Reach Ltd GB
AS16276 OVH SAS FR
AS8218 operated Upstreamnet gmbh FR
AS8218 Zayo Infrastructure France SA FR
AS29504 Freenet Liberec, z.s. CZ
AS24940 Hetzner Online GmbH DE
AS39120 Convergenze S.p.A. IT
AS53062 GGNET TELECOMUNICACOES LTDA BR
AS206735 Novelcomm LP GR
AS44306 OMONIA d.o.o. HR
AS14840 BR.Digital Telecom BR
AS33891 Core-Backbone GmbH DE
AS32590 Valve Corporation US
AS57463 NetIX Communications JSC BG
AS12735 TurkNet Iletisim Hizmetleri A.S. TR
AS44306 OMONIA HR
AS16019 Vodafone Czech Republic a.s. CZ
AS1764 Next Layer Telekommunikationsdienstleistungs- und Beratungs GmbH AT
AS8801 Rocket Fibre Ltd GB
AS6204 INTERKVM HOST SRL RO
AS212483 LEVEL EIGHTY SIX COMMUNICATIONS LTD GB
AS5588 T Mobile Czech Republic a.s. CZ
AS132337 Axclusive SG
AS49544 i3D.net B.V NL

Upstreams

AS Number Description Country
AS39120 Convergenze S.p.A. IT
AS44306 OMONIA d.o.o. HR
AS14840 BR.Digital Telecom BR
AS6855 Slovak Telekom, a.s. SK
AS1764 Next Layer Telekommunikationsdienstleistungs und Beratungs GmbH AT
AS6939 Hurricane Electric LLC US
AS6204 ZET.NET IP Transit RO
AS12735 TurkNet Iletisim Hizmetleri A.S. TR
AS22356 Durand do Brasil Ltda BR
AS6663 Euroweb Romania S.R.L. RO
AS33891 Core Backbone GmbH DE
AS8218 operated Upstreamnet gmbh FR
AS4455 IX Reach Ltd GB

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Frequently Asked Questions

ASN AS204394 is an Autonomous System Number used to identify a network for BGP internet routing.
AS204394 is listed under Cortex, a.s..
Peers are lateral network interconnections, upstreams are transit providers, and downstreams are customer networks receiving connectivity.
Routes and IP ranges are the network prefixes announced by the ASN on the internet and show the address space it originates.
WHOIS provides registration and contact context for ASN ownership, administration, and operational reference.
This page previews large ASN datasets. Use See more to load additional rows, and upgrade your plan to view complete peer, route, upstream, and downstream data.