212.4.128.0/19

AS12570 · O2 Czech Republic, a.s.

Need more data or want to access it via API or data downloads? Sign up to get free access

Summary

Country	Czechia
Domain	o2.cz
ASN	AS12570
Registry	RIPE
ID	CZ-CZNET-20080611

WHOIS Details

inetnum:        212.4.128.0 - 212.4.159.255
netname:        CZ-CZNET-20080611
org:            ORG-STaN1-RIPE
country:        CZ
admin-c:        CZO2-RIPE
tech-c:         CZO2-RIPE
status:         ALLOCATED PA
mnt-by:         RIPE-NCC-HM-MNT
mnt-by:         AS5610-MTN
created:        2008-06-11T13:41:00Z
last-modified:  2024-06-20T15:31:29Z
source:         RIPE
abuse-email:    abuse@o2.cz
abuse-c:        AR14410-RIPE
abuse-org:      ORG-STaN1-RIPE

organisation:   ORG-STaN1-RIPE
org-name:       O2 Czech Republic, a.s.
country:        CZ
org-type:       LIR
address:        Za Brumlovkou 266/2
address:        140 22
address:        Praha 4 - Michle
address:        CZECH REPUBLIC
phone:          +420 2 71466184
fax-no:         +420 2 71464414
e-mail:         marek.vogel@o2.cz
admin-c:        VAKO1-RIPE
admin-c:        MV96-RIPE
admin-c:        HVJI1-RIPE
tech-c:         CZO2-RIPE
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
abuse-email:    abuse@o2.cz
abuse-c:        AR14410-RIPE
abuse-org:      undefined

role:           5610-Tech-and-Admin
address:        Za Brumlovkou 266/2
address:        Praha 4 - Michle, PSC 140 22
e-mail:         router@o2.cz
nic-hdl:        CZO2-RIPE
admin-c:        VAKO1-RIPE
admin-c:        MV96-RIPE
admin-c:        HVJI1-RIPE
tech-c:         VAKO1-RIPE
tech-c:         HVJI1-RIPE
abuse-mailbox:  abuse@o2.cz
org:            ORG-STaN1-RIPE
mnt-by:         AS5610-MTN
created:        2016-02-18T09:58:30Z
last-modified:  2018-04-20T10:44:21Z
source:         RIPE

route:          212.4.128.0/19
descr:          ITSELF
origin:         AS12570
mnt-by:         MNET-IP-MNT
remarks:        Please report abuse -> abuse@selfnet.cz
created:        2008-06-20T07:26:08Z
last-modified:  2018-09-27T08:30:09Z
source:         RIPE

Overlapping Ranges

BGP prefixes that are contained by 212.4.128.0/19

Range	ASN	Company	Num of IPs
212.4.132.0/24	AS51424	SPERLNET s.r.o.	256
212.4.142.0/23	AS56566	SATT a.s.	512

Nearby Ranges

BGP prefixes that overlap with 212.4.0.0/16

Range	ASN	Company	Num of IPs
212.4.224.0/19	AS12665	MSH Medien System Haus GmbH & Co. KG	8,192
212.4.160.0/19	AS20676	Plusnet GmbH	8,192
212.4.32.0/19	AS2119	Telenor Norge AS	8,192
212.4.96.0/19	AS29231	Grupalia Internet S.A.	8,192
212.4.0.0/19	AS702	Verizon Italia SpA	8,192
212.4.64.0/19	AS8821	WWZ Telekom AG	8,192
212.4.192.0/19	AS8918	Coolwave Communications Limited	8,192
212.4.240.0/22	AS16509	MSH Medien System Haus GmbH & Co. KG	1,024
212.4.142.0/23	AS56566	SATT a.s.	512
212.4.27.0/24	AS16509	Verizon Italia SpA	256
212.4.132.0/24	AS51424	SPERLNET s.r.o.	256
212.4.110.0/24	AS29231	Grupalia Network	256
212.4.195.0/24	AS8918	Coolwave Communications Limited	256

Hosted domains

There are 759 domain names hosted across 98 IP addresses on this ASN. Checkout our API to access full domain hosting information.

IP Address	Domain	Domains on this IP
212.4.158.38	online-jazykove-kurzy.cz	104
212.4.158.101	office2cloud.cz	50
212.4.158.48	td-fs.eu	42
212.4.138.26	radimkravcik.cz	34
212.4.153.212	umaflor.cz	34
212.4.138.244	vegatm.cz	25
212.4.153.241	finvi.eu	24
212.4.158.57	svatbavzahranici.eu	24
212.4.158.60	mlcon.eu	24
212.4.153.244	familysport.cz	23
212.4.158.46	svatbynalodi.cz	20
212.4.158.36	sormovi.eu	19
212.4.158.42	dozralova.cz	19
212.4.153.226	vankova-design.cz	17
212.4.158.231	skoleni194.cz	17
212.4.138.14	lipareal.cz	14
212.4.158.49	nibowaka.net	14
212.4.138.13	zsnonanmnm.cz	13
212.4.158.53	svatbanarece.cz	13
212.4.136.153	elis-real.cz	13

Hosted domains API

Our Hosted Domains API, or Reverse IP API returns a full list of domains that are hosted on a single IP address.

Useful for Cybersecurity

Read more

Pingable IPs

1,032 IPs in this range replied to an ICMP ping during our most recent internet scan. Learn more.

IP Address	ASN	Details
212.4.132.124	AS51424 Jiri Sperl	`3.44ms` from Prague, CZ
212.4.129.254	AS12570 O2 Czech Republic, a.s.	`7.25ms` from Brno, CZ
212.4.156.8	AS12570 O2 Czech Republic, a.s.	`1.16ms` from Brno, CZ
212.4.131.114	AS12570 O2 Czech Republic, a.s.	`4.98ms` from Brno, CZ
212.4.152.140	AS12570 O2 Czech Republic, a.s.	`0.10ms` from Brno, CZ
212.4.158.2	AS12570 O2 Czech Republic, a.s.	`0.99ms` from Brno, CZ
212.4.150.1	AS12570 O2 Czech Republic, a.s.	`0.87ms` from Brno, CZ
212.4.157.50	AS12570 O2 Czech Republic, a.s.	`1.44ms` from Brno, CZ
212.4.153.1	AS12570 O2 Czech Republic, a.s.	`0.79ms` from Brno, CZ
212.4.133.1	AS12570 O2 Czech Republic, a.s.	`3.02ms` from Brno, CZ
212.4.128.1	AS12570 O2 Czech Republic, a.s.	`0.82ms` from Brno, CZ
212.4.139.2	AS12570 O2 Czech Republic, a.s.	`1.56ms` from Brno, CZ
212.4.155.137	AS12570 O2 Czech Republic, a.s.	`1.66ms` from Brno, CZ
212.4.135.143	AS12570 O2 Czech Republic, a.s.	`7.30ms` from Brno, CZ
212.4.136.102	AS12570 O2 Czech Republic, a.s.	`0.90ms` from Brno, CZ
212.4.130.1	AS12570 O2 Czech Republic, a.s.	`1.54ms` from Brno, CZ
212.4.151.224	AS12570 O2 Czech Republic, a.s.	`7.30ms` from Brno, CZ
212.4.134.1	AS12570 O2 Czech Republic, a.s.	`0.84ms` from Brno, CZ
212.4.143.129	AS56566 SATT a.s.	`3.33ms` from Prague, CZ
212.4.144.1	AS12570 O2 Czech Republic, a.s.	`3.26ms` from Brno, CZ
212.4.154.1	AS12570 O2 Czech Republic, a.s.	`2.03ms` from Brno, CZ
212.4.148.1	AS12570 O2 Czech Republic, a.s.	`2.07ms` from Brno, CZ
212.4.137.117	AS12570 O2 Czech Republic, a.s.	`1.51ms` from Brno, CZ
212.4.138.1	AS12570 O2 Czech Republic, a.s.	`0.99ms` from Brno, CZ
212.4.142.66	AS56566 SATT a.s.	`3.40ms` from Prague, CZ

Other Pingable IPs

Below is a random selection of 25 IPs that replied to an ICMP ping during our most recent internet scan.

IP Address	ASN	Details
101.43.226.3	AS45090 Shenzhen Tencent Computer Systems Company Limited	`1.76ms` from Beijing, CN
76.138.9.35	AS7922 Comcast Cable Communications, LLC	`14.90ms` from Dallas, US
176.255.11.211	AS5607 Sky UK Limited	`5.99ms` from Erith, GB
117.103.196.67	AS38248 VTC-VN	`0.34ms` from Hanoi, VN
123.221.92.147	AS4713 NTT DOCOMO BUSINESS,Inc.	`6.64ms` from Osaka, JP
178.45.43.147	AS12389 PJSC Rostelecom	`0.63ms` from Samara, RU
201.105.50.227	AS8151 UNINET	`12.35ms` from Santiago de Queretaro, MX
14.75.150.99	AS4766 Korea Telecom	`8.56ms` from Seoul, KR
43.156.120.99	AS132203 Tencent Building, Kejizhongyi Avenue	`0.28ms` from Singapore, SG
114.25.14.115	AS3462 Data Communication Business Group	`1.42ms` from Taipei, TW
111.175.97.115	AS4134 CHINANET-BACKBONE	`1.24ms` from Wuhan, CN
39.164.60.35	AS24445 Henan Mobile Communications Co.,Ltd	`6.59ms` from Zhengzhou, CN
35.236.217.115	AS396982 Google LLC	`0.14ms` from Ashburn, US
45.23.10.115	AS7018 AT&T Enterprises, LLC	`11.13ms` from Atlanta, US
35.190.196.147	AS396982 Google LLC	`0.14ms` from Brussels, BE
91.104.87.51	AS213155 Yettel Hungary Ltd.	`11.75ms` from Budapest, HU
75.242.210.51	AS6167 Verizon Business	`17.41ms` from Chicago, US
75.64.192.67	AS7922 Comcast Cable Communications, LLC	`15.36ms` from Dallas, US
37.197.27.227	AS1257 Tele2 Sverige AB	`3.92ms` from Goeteborg, SE
87.247.154.115	AS47987 Zemlyaniy Dmitro Leonidovich	`0.39ms` from Kyiv, UA
80.6.55.147	AS5089 Virgin Media Limited	`8.00ms` from London, GB
82.52.176.83	AS3269 Telecom Italia S.p.A.	`5.72ms` from Milan, IT
47.13.53.35	AS20115 Charter Communications LLC	`19.34ms` from Murfreesboro, US
61.164.65.3	AS4134 CHINANET-BACKBONE	`2.18ms` from Ningbo, CN
221.114.151.227	AS17506 ARTERIA Networks Corporation	`1.34ms` from Osaka, JP

Traceroute

Below is a recent traceroute taken from the IPinfo ProbeNet to an IP in this range. Learn more.

traceroute -a -n -q1 -f3 212.4.136.102

traceroute to 212.4.136.102 (212.4.136.102): 64 hops max, 52 byte packets

3 [AS12570] 212.96.178.65 1.412 ms

4 [AS12570] 212.4.136.102 1.005 ms

Measurement taken from

IPinfo ProbeNet in Brno, CZ

On December 6th 2025

What are IP address ranges?

IP address ranges, or netblocks, are groups of related IP addresses. They are usually represented as a base IP address, followed by a slash, and then a netmask which represents how many IP addresses are contained within the netblock. This format is known as CIDR. You'll also sometimes see netblocks given as a start ip address, and an end ip address, or an ip address range.

Traffic works its way around the internet based on the routing table, which contains a list of networks and their associated netblocks.

An API built with users in mind: reliable, accurate, and easy-to-use

Discover why industry-leading companies around the globe love our data. IPinfo's accurate insights fuel use cases from cybersecurity, data enrichment, web personalization, and much more.

Get Started for Free Contact Sales