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Czechia

IP address space, AS numbers and the largest networks registered in Czechia, based on the delegation records of the regional internet registries.

IPv4 addresses
9.6M
1,783 blocks
IPv6 allocations
677
AS numbers
715
Routed AS numbers
601

Largest networks in Czechia

By announced prefixes
ASNameIPv4 prefixesIPv6 prefixes
AS208414WEDOS-GLOBAL
WEDOS Internet, a.s.		11104
AS16019VODAFONE-CZ-AS
Vodafone Czech Republic a.s.		9017
AS5610O2-CZECH-REPUBLIC
O2 Czech Republic, a.s.		675
AS21430WIA-AS
WIA spol. s.r.o.		655
AS15685CASABLANCA-AS
CASABLANCA INT a.s.		591
AS204666TLAPNET-CZ
Jiri Tlapak		3810
AS44002SYS-DATACOM
Sys-DataCom s.r.o.		1333
AS24971MASTER-AS
MasterDC s.r.o.		3313
AS42908CZ-NORDICTELECOMREGIONAL
O2 Czech Republic, a.s.		359
AS29208QUANTCOM-AS
Quantcom, a.s.		365
AS13036TMOBILE-CZ
T-Mobile Czech Republic a.s.		343
AS35592COOLHOUSING-AS
Coolhousing s.r.o.		314
AS44489Starnet
STARNET, s.r.o.		267
AS49121INFTELE-AS
Infinity Telecom, s.r.o.		209
AS198605AVAST-AS-DC
AVAST Software s.r.o.		218
AS29134IGNUM-AS
Webglobe, s.r.o.		226
AS2852CESNET2
CESNET z.s.p.o.		261
AS203645RYZNAR-AS
Jan Ryznar		423
AS207700Reliable-Communications
Reliable Communications s.r.o.		270
AS201730DataSpring
Cloud4com s.r.o.		261
AS43541VSHOSTING
VSHosting s.r.o.		207
AS5588GTSCE
T-Mobile Czech Republic a.s.		232
AS200449QRATOR-CZ
Qrator Labs CZ s.r.o.		1014
AS51248HOST-TELECOM
Host-Telecom.com s.r.o.		175
AS24806INTERNET-CZ
INTERNET CZ, a.s.		211
AS206438MXNET-AS
MX-NET Telekomunikace s.r.o.		517
AS30764PODA-AS
PODA a.s.		192
AS60592GRANSY
Gransy s.r.o.		173
AS35236AS35236
UVT Internet s.r.o.		128
AS204383CZ-SPCOM-AS
SPCom s.r.o.		191

Delegations by registry: RIPE 2,453, ARIN 7. Updated 2026-10-04.