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	Prefix	Description
	80.78.144.0/20	O2 Czech Republic, a.s.
	88.83.224.0/19	O2 Czech Republic, a.s.
	89.190.40.0/21	O2 Czech Republic, a.s.
	89.190.48.0/20	O2 Czech Republic, a.s.
	109.105.32.0/19	O2 Czech Republic, a.s.
	185.8.188.0/22	O2 Czech Republic, a.s.
	193.17.248.0/22	ZEAL s.r.o.
	195.78.122.0/23	ZEAL s.r.o.
	212.4.128.0/19	O2 Czech Republic, a.s.
	212.96.160.0/19	O2 Czech Republic, a.s.
	213.211.32.0/19	O2 Czech Republic, a.s.
	2001:4ba8::/29	O2 Czech Republic, a.s.
	2a0b:bb41::/32	Netstone s.r.o.

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Network Policy

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How are upstreams and downstreams calculated?

Upstreams

	ASN	Description	IPv4	IPv6
	AS16246	O2 Czech Republic, a.s.	✔	✔

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Peers

	ASN	Description	IPv4	IPv6
	AS16246	O2 Czech Republic, a.s.	✔	✔
	AS213354	INTERNATIONAL HOSTING SOLUTIONS LLP	✔	✔
	AS51424	Jiri Sperl	✔	✘
	AS197798	Net-Connect s.r.o.	✔	✔
	AS204886	Metropolitni sit Humpolec spol. s r.o.	✔	✔
	AS211334	MASTER IT Technologies, a.s.	✔	✘
	AS196815	LAN servis s.r.o.	✔	✘
	AS47941	Red Hat Ltd	✔	✘
	AS198620	Bralu Jurjanu biedriba	✔	✘
	AS205947	NDC ICT Solutions s.r.o.	✔	✘
	AS25192	CZ.NIC, z.s.p.o.	✔	✘
	AS202979	NGA Services, spol. s r.o.	✔	✔
	AS48091	Kraj Vysocina	✔	✔

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Downstreams

	ASN	Description	IPv4	IPv6
	AS213354	INTERNATIONAL HOSTING SOLUTIONS LLP	✔	✔
	AS51424	Jiri Sperl	✔	✘
	AS197798	Net-Connect s.r.o.	✔	✔
	AS204886	Metropolitni sit Humpolec spol. s r.o.	✔	✔
	AS47941	Red Hat Ltd	✔	✘
	AS198620	Bralu Jurjanu biedriba	✔	✘
	AS211334	MASTER IT Technologies, a.s.	✔	✘
	AS25192	CZ.NIC, z.s.p.o.	✔	✘
	AS202979	NGA Services, spol. s r.o.	✔	✔
	AS48091	Kraj Vysocina	✔	✔
	AS196815	LAN servis s.r.o.	✔	✘
	AS205947	NDC ICT Solutions s.r.o.	✔	✘

aut-num:        AS12570
as-name:        ITSELF
descr:          Network and internet service provider.
descr:          Czech Republic
remarks:        ======================= Upstream providers ========================
mp-import:      afi any.unicast from AS3257 accept ANY
mp-import:      afi any.unicast from AS6939 accept ANY
mp-import:      afi any.unicast from AS9002 accept ANY
mp-export:      afi any.unicast to AS3257 announce AS-NEJCZ-TRANSIT
mp-export:      afi any.unicast to AS6939 announce AS-NEJCZ-TRANSIT
mp-export:      afi any.unicast to AS9002 announce AS-NEJCZ-TRANSIT
remarks:        ========================= Customers ==========================
mp-import:      afi any.unicast from AS12570:AS-CUSTOMERS action pref=900; accept <AS12570:AS-CUSTOMERS+$>
mp-export:      afi any.unicast to AS12570:AS-CUSTOMERS announce ANY
remarks:        ======================= NIX peerings ==========================
mp-import:      from AS-NIXCZ-RSCLIENTS action pref=500; accept ANY
mp-export:      to AS-NIXCZ-RSCLIENTS announce AS-NEJCZ-TRANSIT
remarks:        = NIX.CZ route server peerings
mp-import:      from AS12570:AS-NIX-PEERS action pref=500; accept ANY
mp-export:      to AS12570:AS-NIX-PEERS announce AS-CZECHBONE
remarks:        = NIX.CZ direct peerings
mp-import:      from AS-NIXSK-RSCLIENTS action pref=500; accept ANY
mp-export:      to AS-NIXSK-RSCLIENTS announce AS-CZECHBONE
remarks:        = NIX.SK route server peerings
remarks:        ======================= Direct peerings ==========================
mp-import:      afi any.unicast from AS15169 accept AS15169
mp-export:      afi any.unicast to AS15169 announce AS-NEJCZ-TRANSIT
remarks:        --------------------------------------------------------------------------------------------------------
remarks:
remarks:
org:            ORG-STaN1-RIPE
admin-c:        DUMY-RIPE
tech-c:         DUMY-RIPE
remarks:        --------------------------------------------------------------------------------------------------------
remarks:
remarks:        BGP communities accepted from downstream:
remarks:        1. Blackhole
remarks:        12570:666
remarks:
remarks:        --------------------------------------------------------------------------------------------------------
remarks:
remarks:        Routing issues and peering requests: noc at itself.cz
remarks:
remarks:        --------------------------------------------------------------------------------------------------------
remarks:
remarks:        This Autonomous System is present at the following exchanges: NIX-CZ, NIX-SK and SIX-SK.
remarks:
remarks:        --------------------------------------------------------------------------------------------------------
remarks:
status:         ASSIGNED
mnt-by:         RIPE-NCC-END-MNT
mnt-by:         AS5610-MTN
created:        2002-05-27T13:11:15Z
last-modified:  2024-06-20T15:31:33Z
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-STaN1-RIPE
org-name:       O2 Czech Republic, a.s.
country:        CZ
org-type:       LIR
address:        Dummy address for ORG-STaN1-RIPE
# Email removed, Log into bgp.tools to see whois emails
abuse-c:        AR14410-RIPE
mnt-ref:        RIPE-NCC-HM-MNT
mnt-ref:        AS5610-MTN
mnt-by:         RIPE-NCC-HM-MNT
mnt-by:         AS5610-MTN
created:        2004-04-17T11:04:17Z
last-modified:  2020-12-16T12:31:56Z
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: 2026-03-11T03:23:49Z UTC

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Member of the following AS-SETs

-	Member	ASN Count
RADB	as-btn-customers	1495
RIPE	as5578:as-sixpeers	51
RIPE	as-cecomczcust-transit	41220
LEVEL3	as-sprint-origins	7309
LEVEL3	as-level3-origins-eu	0
RIPE	as-to2-nix-peer	63
RIPE	as-ebone	79534
RIPE	as12570:as-fenix	1
RIPE	as-sixsk-members	57
RIPE	as-emaxsixpeers	39
RIPE	as-43413_nt-nix	69
LEVEL3	as-level3-origins-na	0
RIPE	as25192:as-transit	9
RIPE	as-cb-cz	2
RIPE	as24971:as-mai-nix-peer	88460
RIPE	as-czechbone	87
RIPE	as-cesnet-nix-peers	89978
RIPE	as42000:as-nixcz-peerings	80