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	Prefix	Description
	185.45.200.0/22	ComSource s.r.o.
	185.138.108.0/23	Customers
	2a01:7fe0::/32	ComSource s.r.o.

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Network Policy

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How are upstreams and downstreams calculated?

Upstreams

	ASN	Description	IPv4	IPv6
	AS1299	Arelion (fka. Telia Carrier)	✔	✔
	AS3356	Lumen (Level 3)	✔	✔
	AS6939	Hurricane Electric LLC	✘	✔
	AS47232	ISP Alliance a.s.	✔	✘

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Peers

	ASN	Description	IPv4	IPv6
	AS1299	Arelion (fka. Telia Carrier)	✔	✔
	AS35592	Coolhousing s.r.o.	✔	✔
	AS6939	Hurricane Electric LLC	✔	✔
	AS3356	Lumen (Level 3)	✔	✔
	AS39790	Web4U s.r.o.	✔	✔
	AS29405	VNET a.s.	✔	✘
	AS205233	KBC GLOBAL SERVICES NV	✔	✘
	AS51013	WebSupport s.r.o.	✔	✘
	AS25234	ACTIVE 24, s.r.o.	✔	✔
	AS35236	UVT Internet s.r.o.	✔	✘
	AS206591	Alza.cz a.s.	✔	✘
	AS206142	Internet TV, Inc.	✔	✘
	AS6204	INTERKVM HOST SRL	✔	✔
	AS8218	Zayo Europe	✔	✔
	AS24940	Hetzner Online GmbH	✔	✔
	AS8778	Slovanet a.s.	✔	✘
	AS49544	i3D.net B.V	✔	✔
	AS42739	Hawe Telekom S.A. in Restructuring	✔	✔
	AS1764	Next Layer Telecommunications	✔	✔
	AS24482	SG.GS	✔	✔
	AS16276	OVH SAS	✔	✔
	AS50338	GamerHost s.r.o.	✔	✔
	AS50698	TETA s.r.o.	✔	✔
	AS49121	Infinity Telecom, s.r.o.	✔	✔
	AS51184	Fonira Telekom GmbH	✔	✔
	AS32590	Valve Corporation	✔	✔
	AS199524	Gcore S.A.	✔	✔
	AS40994	Alwyzon (Hohl IT)	✔	✔
	AS34170	Aztelekom LLC	✔	✘
	AS21430	WIA spol. s.r.o.	✔	✘
	AS2852	CESNET z.s.p.o.	✔	✘
	AS42473	Anexia Cloud Solutions GmbH	✔	✔
	AS36236	NetActuate, Inc	✔	✔
	AS132337	Axclusive	✔	✘
	AS199081	Lancom Ltd.	✔	✘
	AS6663	Türk Telekom International	✔	✔
	AS44306	OMONIA d.o.o.	✔	✘
	AS4455	IX Reach Ltd	✔	✘
	AS21215	UNITED GROUP NETWORK INFRASTRUCTURE d.o.o. Beograd	✔	✘
	AS263444	Open X Tecnologia Ltda	✔	✘
	AS7713	PT Telkom Indonesia Tbk	✔	✘
	AS47200	NIX.CZ Route Servers	✔	✘
	AS10099	China Unicom Global	✔	✘
	AS47232	ISP Alliance a.s.	✔	✘

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Downstreams

	ASN	Description	IPv4	IPv6
	AS35592	Coolhousing s.r.o.	✔	✔
	AS39790	Web4U s.r.o.	✔	✔
	AS29405	VNET a.s.	✔	✘
	AS51013	WebSupport s.r.o.	✔	✘
	AS205233	KBC GLOBAL SERVICES NV	✔	✘
	AS25234	ACTIVE 24, s.r.o.	✔	✔
	AS35236	UVT Internet s.r.o.	✔	✘
	AS206591	Alza.cz a.s.	✔	✘
	AS206142	Internet TV, Inc.	✔	✘
	AS8778	Slovanet a.s.	✔	✘

aut-num:        AS199803
as-name:        ComSource
org:            ORG-CS265-RIPE
import:         from AS-NIXCZ-CLIENTS accept AS-NIXCZ-CLIENTS
import:         from AS-NIXSK-RSCLIENTS accept AS-NIXSK-RSCLIENTS
import:         from AS33891 accept ANY
import:         from AS3257 accept ANY
import:         from AS197284 accept ANY
import:         from AS201730 accept AS-CZ-DS
import:         from AS25234 accept ANY
import:         from AS51013 accept ANY
import:         from AS35236 accept ANY
import:         from AS50825 accept ANY
import:         from AS35592 accept ANY
import:         from AS206142 accept ANY
import:         from AS1299 accept ANY
import:         from AS205233 accept ANY
export:         to AS-NIXCZ-CLIENTS announce AS-COMSOURCE
export:         to AS-NIXSK-RSCLIENTS announce AS-COMSOURCE
export:         to AS33891 announce AS-COMSOURCE
export:         to AS3257 announce AS-COMSOURCE
export:         to AS197284 announce AS-COMSOURCE
export:         to AS201730 announce AS-COMSOURCE
export:         to AS25234 announce AS-COMSOURCE
export:         to AS35236 announce AS-COMSOURCE
export:         to AS50825 announce AS-COMSOURCE
export:         to AS35592 announce AS-COMSOURCE
export:         to AS206142 announce AS-COMSOURCE
export:         to AS1299 announce AS-COMSOURCE
export:         to AS51013 announce AS-COMSOURCE
admin-c:        DUMY-RIPE
tech-c:         DUMY-RIPE
status:         ASSIGNED
notify:         hostmaster@comsource.cz
mnt-by:         RIPE-NCC-END-MNT
mnt-by:         mnt-comsource
created:        2014-01-21T11:22:52Z
last-modified:  2022-07-27T10:45:44Z
source:         RIPE
remarks:        ****************************
remarks:        * THIS OBJECT IS MODIFIED
remarks:        * Please note that all data that is generally regarded as personal
remarks:        * data has been removed from this object.
remarks:        * To view the original object, please query the RIPE Database at:
remarks:        * http://www.ripe.net/whois
remarks:        ****************************


organisation:   ORG-CS265-RIPE
org-name:       ComSource s.r.o.
country:        CZ
org-type:       LIR
address:        Dummy address for ORG-CS265-RIPE
# Email removed, Log into bgp.tools to see whois emails/phone numbers
abuse-c:        COMS-RIPE
mnt-ref:        RIPE-NCC-HM-MNT
mnt-ref:        mnt-comsource
mnt-by:         RIPE-NCC-HM-MNT
mnt-by:         mnt-comsource
created:        2014-01-20T11:11:57Z
last-modified:  2026-04-29T05:34:27Z
source:         RIPE
remarks:        ****************************
remarks:        * THIS OBJECT IS MODIFIED
remarks:        * Please note that all data that is generally regarded as personal
remarks:        * data has been removed from this object.
remarks:        * To view the original object, please query the RIPE Database at:
remarks:        * http://www.ripe.net/whois
remarks:        ****************************

Last Update: 2026-05-06T03:24:00Z UTC

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Member of the following AS-SETs

-	Member	ASN Count
RIPE	as42000:as-upstreams	5
RIPE	as-pantel-sk-cz	25
RADB	as-hurricanev6	20839
RIPE	as-comsource	505
RIPE	as-sixsk-members	57
RIPE	as-websupport	3
LEVEL3	as-lumen-customers-asns	10695