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Data as of Nov 4, 2026

178.17.96.0/20

No anonymizer space · no proxy exits in 30 days

O2 Czech Republic, a.s.

Announcement
this exact prefix
RPKI valid
Announced by
AS16246
Type
Residential
94% of it

Registrations in this block

The registry's network records over the announcement: those covering it, widest first, then every record inside it, under its parent.

RangeAddressesNetnameHolderTypeCreatedAbuse contact
178.17.80.0 - 178.17.111.2558,192CZ-CZNET-20100318O2 Czech Republic, a.s. (ORG-STAN1-RIPE) · CZALLOCATED PAApr 1, 2025abuse@o2.cz
└ 178.17.96.0/24256NEJCZ_CATRunknownASSIGNED PAJan 12, 2021abuse@o2.cz
via CZ-CZNET-20100318
└ 178.17.97.0/24256NEJCZ_CATRunknownASSIGNED PAJan 12, 2021abuse@o2.cz
via CZ-CZNET-20100318
└ 178.17.98.0/24256NEJCZ_CATRunknownASSIGNED PAJan 12, 2021abuse@o2.cz
via CZ-CZNET-20100318
└ 178.17.99.0/24256NEJCZ_CATRunknownASSIGNED PAJan 12, 2021abuse@o2.cz
via CZ-CZNET-20100318
└ 178.17.100.0/24256NEJCZ_CATRunknownASSIGNED PAJan 12, 2021abuse@o2.cz
via CZ-CZNET-20100318
└ 178.17.101.0/24256NEJCZ_CATRunknownASSIGNED PAJan 12, 2021abuse@o2.cz
via CZ-CZNET-20100318
└ 178.17.102.0/24256NEJCZ_CATRunknownASSIGNED PAJan 12, 2021abuse@o2.cz
via CZ-CZNET-20100318
└ 178.17.103.0/24256NEJCZ_CATRunknownASSIGNED PAJan 12, 2021abuse@o2.cz
via CZ-CZNET-20100318
└ 178.17.104.0/24256NEJCZ_CATRunknownASSIGNED PAJan 12, 2021abuse@o2.cz
via CZ-CZNET-20100318
└ 178.17.105.0/24256NEJCZ_CATRunknownASSIGNED PAJan 13, 2021abuse@o2.cz
via CZ-CZNET-20100318
└ 178.17.106.0/24256NEJCZ_CATRunknownASSIGNED PAJan 13, 2021abuse@o2.cz
via CZ-CZNET-20100318
└ 178.17.107.0/24256NEJCZ_CATRunknownASSIGNED PAJan 13, 2021abuse@o2.cz
via CZ-CZNET-20100318
└ 178.17.108.0/24256NEJCZ_CATRunknownASSIGNED PAJan 13, 2021abuse@o2.cz
via CZ-CZNET-20100318
└ 178.17.109.0/24256NEJCZ_CATRunknownASSIGNED PAJan 13, 2021abuse@o2.cz
via CZ-CZNET-20100318
└ 178.17.110.0/24256NEJCZ_CATRunknownASSIGNED PAJan 13, 2021abuse@o2.cz
via CZ-CZNET-20100318
└ 178.17.111.0/24256NEJCZ_CATR_serversunknownASSIGNED PAJan 13, 2021abuse@o2.cz
via CZ-CZNET-20100318

A contact marked “via” is the registry's: the record names none of its own, so the registry hands down its parent's.

Composition

The types across the prefix's announced space, by addresses.

Announced space

Address share

Announced space

Types across the prefix

4,096 addresses
TypeAddressesShareRanges
Residential3,84094%1
Hosting2566.3%1

Network & registry

AnnouncementRouting historyRPKI & IRRWhois & abuse
Origin network

AS16246

CZ
Name
O2 Czech Republic, a.s.
Type
Internet provider
Registered
Feb 7, 2001
Domain
o2.cz
Website
www.nej.cz
Industry
Internet Service Provider (ISP)
Spamhaus ASN-DROP
not listed