Organization

O2 Czech Republic, a.s.

Enterprise Czechia

IPv4 addresses

2,032,128

CIDR ranges

145

Reputation · trust score

A transparent 0–100 signal. Every entity starts at a neutral baseline of 65; threat-intel blocklists, exposure, reverse-DNS, routing and allocation each adjust it up or down. Higher is more trustworthy.

69/100

Moderate

How this score is built

Baseline (neutral) 65
Enterprise allocation +4
Trust score 69 / 100

Experimental · trust-vectors model v1.2.0 — a transparent heuristic, not a definitive verdict. How it works →

About Nej.cz

Company in the Czech Republic.

Founded

2014

Headquarters

Prague

Industry

telecommunications

Parent

Kaprain Holdings

Employees

197

Operates 7 networks present at 2 internet exchanges with a open peering policy.

Data from Wikidata

O2 Czech Republic, a.s. — global IP footprint

Cities where O2 Czech Republic, a.s. has measurable IPv4 allocation. Click any dot to open that city's page. Size and color scale with IP count.

Countries served by O2 Czech Republic, a.s.

Every country where this organization has IPv4 allocations, ranked by IPs held.

Czechia 2.04M

ASNs owned by O2 Czech Republic, a.s.

ASN	Name	IPs	Prefixes	Country
AS5610	O2 Czech Republic, a.s.	1.54M	47	CZ
AS42908	O2 Czech Republic, a.s.	183.3K	35	CZ
AS16246	O2 Czech Republic, a.s.	133.1K	13	CZ
AS31246	O2 Czech Republic, a.s.	66.6K	5	CZ
AS12570	O2 Czech Republic, a.s.	50.2K	31	CZ
AS41046	O2 Czech Republic, a.s.	32.8K	4	CZ
AS29321	O2 Czech Republic, a.s.	15.4K	5	CZ
AS49767	O2 Czech Republic, a.s.	5.1K	2	CZ
AS44070	O2 Czech Republic, a.s.	4.1K	2	CZ
AS47681	O2 Czech Republic, a.s.	1.0K	1	CZ

Largest CIDR ranges

CIDR	IPs	PTR Density	ASN	Country	State	City
88.100.0.0/14	262.1K	77.8%	AS5610	CZ	Plzeň Region	Pilsen
90.180.0.0/14	262.1K	22.6%	AS5610	CZ	Prague	Prague
85.70.0.0/15	131.1K	96.3%	AS5610	CZ	Prague	Prague
85.160.0.0/15	131.1K	99.2%	AS5610	CZ	Prague	Prague
90.178.0.0/15	131.1K	100.0%	AS5610	CZ	Prague	Prague
109.80.0.0/15	131.1K	0.0%	AS5610	CZ	Prague	Prague
80.188.0.0/16	65.5K	36.5%	AS5610	CZ	Ústí nad Labem Region	Bechlín
83.208.0.0/16	65.5K	92.4%	AS5610	CZ	Prague	Prague
90.177.0.0/16	65.5K	100.0%	AS5610	CZ	Moravian-Silesian Region	Brušperk
160.218.0.0/16	65.5K	86.3%	AS5610	CZ	Central Bohemia	Lysá nad Labem
188.175.0.0/16	65.5K	89.9%	AS16246	CZ	Moravian-Silesian Region	Frýdek-Místek
37.188.128.0/17	32.8K	95.0%	AS5610	CZ	Prague	Prague
83.240.0.0/17	32.8K	16.9%	AS31246	CZ	Pardubice Region	Vražné
90.176.128.0/17	32.8K	99.1%	AS5610	CZ	Moravian-Silesian Region	Ostrava
194.228.0.0/17	32.8K	11.0%	AS5610	CZ	South Moravian	Brno
213.19.0.0/17	32.8K	93.0%	AS42908	CZ	Pardubice Region	Litomyšl
78.136.128.0/18	16.4K	95.2%	AS42908	CZ	Prague	Prague
85.193.0.0/18	16.4K	12.5%	AS5610	CZ	South Moravian	Brno
90.176.64.0/18	16.4K	100.0%	AS5610	CZ	Prague	Prague
94.74.192.0/18	16.4K	87.2%	AS16246	CZ	Prague	Prague
94.241.64.0/18	16.4K	100.0%	AS42908	CZ	Moravian-Silesian Region	Vratimov
95.82.128.0/18	16.4K	17.9%	AS31246	CZ	South Moravian	Brno
178.72.192.0/18	16.4K	97.3%	AS41046	CZ	Moravian-Silesian Region	Ostrava
194.228.192.0/18	16.4K	6.2%	AS5610	CZ	Prague	Prague
213.250.192.0/18	16.4K	100.0%	AS42908	CZ	Pardubice Region	Morašice
46.39.160.0/19	8.2K	17.5%	AS31246	CZ	South Moravian	Brno
82.114.192.0/19	8.2K	95.1%	AS41046	CZ	Olomouc Region	Přerov
82.150.160.0/19	8.2K	32.2%	AS16246	CZ	Ústí nad Labem Region	Lovosice
83.69.32.0/19	8.2K	99.7%	AS5610	CZ	—	—
86.63.192.0/19	8.2K	45.0%	AS16246	CZ	Olomouc Region	Olomouc
88.81.64.0/19	8.2K	97.4%	AS42908	CZ	Moravian-Silesian Region	Frýdlant nad Ostravicí
88.83.160.0/19	8.2K	0.2%	AS5610	CZ	South Bohemian Region	Český Krumlov
88.83.224.0/19	8.2K	90.8%	AS12570	CZ	South Moravian	Velké Pavlovice
90.176.32.0/19	8.2K	100.0%	AS5610	CZ	Prague	Prague
91.187.32.0/19	8.2K	100.0%	AS42908	CZ	Olomouc Region	Olomouc
91.191.96.0/19	8.2K	99.4%	AS5610	SK	—	—
92.240.160.0/19	8.2K	92.6%	AS16246	CZ	Liberec Region	Česká Lípa
92.243.192.0/19	8.2K	0.0%	AS5610	CZ	—	—
109.105.32.0/19	8.2K	5.9%	AS12570	CZ	South Moravian	Břeclav
109.108.96.0/19	8.2K	100.0%	AS42908	CZ	Pardubice Region	Ústí nad Orlicí
176.102.128.0/19	8.2K	99.0%	AS42908	CZ	Olomouc Region	Uničov
194.228.160.0/19	8.2K	0.9%	AS5610	CZ	Prague	Prague
213.155.32.0/19	8.2K	98.9%	AS42908	CZ	Pardubice Region	Opatov
213.155.224.0/19	8.2K	0.0%	AS31246	CZ	Moravian-Silesian Region	Opava
213.180.32.0/19	8.2K	43.6%	AS16246	CZ	Central Bohemia	Neratovice
5.102.48.0/20	4.1K	96.3%	AS42908	CZ	Central Bohemia	Beroun
77.242.80.0/20	4.1K	99.2%	AS41046	CZ	South Bohemian Region	Tábor
80.78.144.0/20	4.1K	81.8%	AS12570	CZ	—	—
80.87.176.0/20	4.1K	86.8%	AS42908	CZ	South Moravian	Velké Bílovice
80.90.128.0/20	4.1K	90.4%	AS42908	CZ	South Moravian	Němčičky
80.243.96.0/20	4.1K	91.1%	AS29321	CZ	Prague	Prague
80.251.240.0/20	4.1K	100.0%	AS42908	CZ	Olomouc Region	Nezamyslice
81.90.160.0/20	4.1K	91.5%	AS5610	CZ	South Bohemian Region	České Budějovice
81.200.48.0/20	4.1K	99.2%	AS41046	CZ	Moravian-Silesian Region	Třinec
92.61.80.0/20	4.1K	100.0%	AS42908	CZ	Zlín	Hulín
95.143.128.0/20	4.1K	100.0%	AS16246	CZ	—	—
109.72.0.0/20	4.1K	98.6%	AS49767	CZ	Central Bohemia	Příbram
109.239.64.0/20	4.1K	0.0%	AS29321	CZ	Prague	Prague
176.98.96.0/20	4.1K	90.7%	AS16246	CZ	Central Bohemia	Příbram
178.17.80.0/20	4.1K	100.0%	AS42908	CZ	Olomouc Region	Olomouc
178.17.96.0/20	4.1K	99.1%	AS16246	CZ	Carlsbad Region	Chodov
194.228.128.0/20	4.1K	10.0%	AS5610	CZ	Prague	Prague
212.4.144.0/20	4.1K	29.6%	AS12570	CZ	Vysocina	Nové Město na Moravě
212.96.160.0/20	4.1K	34.4%	AS12570	CZ	South Moravian	Hrušovany nad Jevišovkou
213.211.48.0/20	4.1K	0.0%	AS12570	CZ	South Moravian	Znojmo
217.117.208.0/20	4.1K	56.1%	AS5610	CZ	Prague	Prague
217.170.96.0/20	4.1K	99.3%	AS42908	CZ	Olomouc Region	Olomouc
217.194.160.0/20	4.1K	0.0%	AS5610	CZ	—	—
217.195.160.0/20	4.1K	50.2%	AS29321	CZ	Prague	Prague
217.196.112.0/20	4.1K	85.0%	AS42908	CZ	Olomouc Region	Hlušovice
217.197.144.0/20	4.1K	73.3%	AS42908	CZ	Olomouc Region	Přerov
31.10.56.0/21	2.0K	93.6%	AS42908	CZ	Pardubice Region	Lanškroun
46.183.56.0/21	2.0K	99.7%	AS42908	CZ	—	—
46.231.72.0/21	2.0K	97.0%	AS42908	CZ	Zlín	Kvasice
77.87.232.0/21	2.0K	99.2%	AS16246	CZ	Prague	Prague
77.95.192.0/21	2.0K	99.4%	AS42908	CZ	—	—
78.41.8.0/21	2.0K	73.6%	AS44070	CZ	—	—
78.108.152.0/21	2.0K	99.2%	AS16246	CZ	—	—
80.78.152.0/21	2.0K	86.1%	AS12570	CZ	—	—
89.31.8.0/21	2.0K	99.1%	AS44070	CZ	—	—
89.190.40.0/21	2.0K	87.1%	AS12570	CZ	South Moravian	Šlapanice
89.190.56.0/21	2.0K	86.9%	AS12570	CZ	—	—
91.191.72.0/21	2.0K	87.1%	AS5610	SK	—	—
91.191.88.0/21	2.0K	100.0%	AS5610	SK	—	—
93.92.48.0/21	2.0K	99.6%	AS42908	CZ	South Moravian	Mikulov
93.93.32.0/21	2.0K	100.0%	AS42908	CZ	Olomouc Region	Hranice
94.143.168.0/21	2.0K	89.8%	AS29321	CZ	Prague	Prague
194.228.144.0/21	2.0K	12.9%	AS5610	CZ	—	—
212.4.144.0/21	2.0K	0.0%	AS12570	CZ	Vysocina	Nové Město na Moravě
212.96.176.0/21	2.0K	48.1%	AS12570	CZ	South Moravian	Kobylnice
45.159.116.0/22	1.0K	96.0%	AS42908	CZ	—	—
80.78.136.0/22	1.0K	0.0%	AS42908	CZ	—	—
80.78.144.0/22	1.0K	89.4%	AS12570	CZ	—	—
80.79.0.0/22	1.0K	99.6%	AS42908	CZ	—	—
80.243.236.0/22	1.0K	100.0%	AS42908	CZ	Pardubice Region	Česká Třebová
89.190.48.0/22	1.0K	99.4%	AS12570	CZ	—	—
91.191.64.0/22	1.0K	99.6%	AS5610	SK	—	—
91.191.84.0/22	1.0K	99.0%	AS5610	SK	—	—
91.193.132.0/22	1.0K	4.7%	AS5610	CZ	—	—
91.197.116.0/22	1.0K	99.0%	AS16246	CZ	—	—

Frequently Asked Questions

How many IP addresses does O2 Czech Republic, a.s. own?

O2 Czech Republic, a.s. controls 2.03M IPv4 addresses distributed across 145 CIDR ranges. The organization is registered in Czechia.

What ASNs does O2 Czech Republic, a.s. operate?

O2 Czech Republic, a.s. operates 10 Autonomous Systems. Each ASN represents an independently routed network that O2 Czech Republic, a.s. manages for internet traffic delivery.

What type of organization is O2 Czech Republic, a.s.?

O2 Czech Republic, a.s. is categorized as enterprise. This classification is based on the organization's primary use of its IP address allocations.

Last updated: 2026-07-26 00:55:31 UTC