Autonomous System details

AS16246

O2 Czech Republic, a.s. · o2.cz

Czechia

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AS16246 – O2 Czech Republic, a.s.

Field	Value
Country	Czechia
Website	o2.cz
Hosted domains	717
IPv4 addresses	133,120
IPv6 addresses	713,053,462,628,379,038,341,895,553,024
ASN type	ISP
Registry	ripe
Allocated	22 years ago on Oct 21, 2003
Updated	2 years ago on Jun 20, 2024

Netblock	Company	Num of IPs
188.175.0.0/16	O2 Czech Republic, a.s.	65,536
94.74.192.0/18	O2 Czech Republic, a.s.	16,384
82.150.160.0/19	O2 Czech Republic, a.s.	8,192
86.63.192.0/19	O2 Czech Republic, a.s.	8,192
92.240.160.0/19	O2 Czech Republic, a.s.	8,192
213.180.32.0/19	O2 Czech Republic, a.s.	8,192
95.143.128.0/20	O2 Czech Republic, a.s.	4,096
176.98.96.0/20	O2 Czech Republic, a.s.	4,096
178.17.96.0/20	O2 Czech Republic, a.s.	4,096
77.87.232.0/21	CATR	2,048
78.108.152.0/21	Assignment for PorubaNET's FO customers	2,048
91.197.116.0/22	CATR	1,024
185.15.252.0/22	O2 Czech Republic, a.s.	1,024

Netblock	Company
2a02:350::/29	O2 Czech Republic, a.s.
2a03:b4c0::/32	O2 Czech Republic, a.s.

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WHOIS Details

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                                                ASHandle:       AS16246
                                                OrgID:          AS16246
                                                ASName:         AS16246
                                                ASNumber:       AS16246
                                                RegDate:        0000-00-00
                                                Updated:        0000-00-00
                                                TechHandle:     AA00-AAAA
                                                Source:         AAAA

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Hosted Domains

There are 717 domain names hosted across 213 IP addresses on this ASN.

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IP Address	Domain	Domains on this IP
188.175.126.28	██████████	43
82.150.165.218	██████████	34
188.175.30.5	██████████	32
94.74.222.181	██████████	30
94.74.229.44	██████████	30
213.180.34.211	██████████	27
94.74.194.116	██████████	26
213.180.35.58	██████████	20
86.63.219.180	██████████	19
94.74.220.5	██████████	17

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Peers

There are 15 peers for this ASN.

Peers	Name
AS12570	O2 Czech Republic, a.s.
AS197197	CETIN a.s.
AS202657	Pavel Jochim
AS207015	Position s.r.o.
AS212315	Frantisek Toman
AS29321	O2 Czech Republic, a.s.
AS31246	NETBOX Autonomous system
AS39736	ICT Support, s.r.o.
AS41046	O2 Czech Republic, a.s.
AS44070	O2 Czech Republic, a.s.
AS47681	O2 Czech Republic, a.s.
AS49767	O2 Czech Republic, a.s.
AS50784	Intraweb servis s.r.o.
AS5610	O2 Czech Republic, a.s.
AS62178	MASTER IT Technologies, a.s.

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ASN API & Database

Upstreams

There is 1 peer for this ASN.

upstreams	Name
AS5610	O2 Czech Republic, a.s.

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Downstreams

There are 14 downstreams for this ASN.

Downstreams	Name
AS12570	O2 Czech Republic, a.s.
AS197197	CETIN a.s.
AS202657	Pavel Jochim
AS207015	Position s.r.o.
AS212315	Frantisek Toman
AS29321	O2 Czech Republic, a.s.
AS31246	NETBOX Autonomous system
AS39736	ICT Support, s.r.o.
AS41046	O2 Czech Republic, a.s.
AS44070	O2 Czech Republic, a.s.
AS47681	O2 Czech Republic, a.s.
AS49767	O2 Czech Republic, a.s.
AS50784	Intraweb servis s.r.o.
AS62178	MASTER IT Technologies, a.s.

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ASN API & Database

Pingable IPs

471 IPs in this ASN replied to an ICMP ping during our most recent internet scan. Learn more.

IP Address	ASN	Details
86.63.205.218	AS16246 O2 Czech Republic, a.s.	`5.57ms` from Prague, CZ
94.74.194.217	AS16246 O2 Czech Republic, a.s.	`0.82ms` from Prague, CZ
213.180.60.78	AS16246 O2 Czech Republic, a.s.	`3.42ms` from Prague, CZ
188.175.237.145	AS16246 O2 Czech Republic, a.s.	`7.21ms` from Prague, CZ
176.98.101.129	AS16246 O2 Czech Republic, a.s.	`1.82ms` from Prague, CZ
188.175.43.41	AS16246 O2 Czech Republic, a.s.	`8.78ms` from Prague, CZ
188.175.217.1	AS16246 O2 Czech Republic, a.s.	`3.23ms` from Prague, CZ
86.63.218.217	AS16246 O2 Czech Republic, a.s.	`3.80ms` from Prague, CZ
213.180.50.18	AS16246 O2 Czech Republic, a.s.	`5.64ms` from Prague, CZ
77.87.237.33	AS16246 O2 Czech Republic, a.s.	`6.18ms` from Prague, CZ
188.175.7.209	AS16246 O2 Czech Republic, a.s.	`8.75ms` from Prague, CZ
188.175.240.211	AS16246 O2 Czech Republic, a.s.	`6.46ms` from Prague, CZ
188.175.63.194	AS16246 O2 Czech Republic, a.s.	`8.69ms` from Prague, CZ
188.175.117.55	AS16246 O2 Czech Republic, a.s.	`6.42ms` from Prague, CZ
188.175.177.1	AS16246 O2 Czech Republic, a.s.	`8.72ms` from Prague, CZ
188.175.50.55	AS16246 O2 Czech Republic, a.s.	`8.96ms` from Prague, CZ
94.74.252.9	AS16246 O2 Czech Republic, a.s.	`5.63ms` from Prague, CZ
94.74.222.145	AS16246 O2 Czech Republic, a.s.	`2.84ms` from Prague, CZ
86.63.212.38	AS16246 O2 Czech Republic, a.s.	`8.03ms` from Prague, CZ
188.175.202.33	AS16246 O2 Czech Republic, a.s.	`6.35ms` from Prague, CZ
86.63.204.13	AS16246 O2 Czech Republic, a.s.	`5.57ms` from Prague, CZ
188.175.9.1	AS16246 O2 Czech Republic, a.s.	`8.68ms` from Prague, CZ
86.63.208.12	AS16246 O2 Czech Republic, a.s.	`5.61ms` from Prague, CZ
188.175.76.1	AS16246 O2 Czech Republic, a.s.	`6.83ms` from Prague, CZ
188.175.245.74	AS16246 O2 Czech Republic, a.s.	`8.85ms` 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
185.36.164.6	AS200133 HUmani Society	`2.80ms` from Brussels, BE
156.204.4.182	AS8452 TE-AS	`6.35ms` from Cairo, EG
137.74.31.54	AS16276 OVH SAS	`0.13ms` from Gravelines, FR
154.93.234.230	AS134548 DXTL Tseung Kwan O Service	`0.76ms` from Hong Kong, HK
162.236.237.86	AS7018 AT&T Enterprises, LLC	`18.56ms` from Kansas City, US
150.143.164.214	AS6871 Plusnet	`2.48ms` from London, GB
72.209.194.6	AS22773 Cox Communications Inc.	`5.57ms` from Los Angeles, US
84.126.88.38	AS6739 VODAFONE ONO, S.A.	`11.95ms` from Madrid, ES
24.208.84.70	AS10796 Charter Communications Inc	`10.73ms` from Milwaukee, US
59.153.13.166	AS36236 NetActuate, Inc	`0.33ms` from Mumbai, IN
188.49.71.198	AS25019 Saudi Telecom Company JSC	`1.68ms` from Riyadh, SA
99.127.229.166	AS7018 AT&T Enterprises, LLC	`3.74ms` from San Jose, US
76.243.127.70	AS7018 AT&T Enterprises, LLC	`3.77ms` from San Jose, US
112.166.230.198	AS4766 Korea Telecom	`5.18ms` from Seoul, KR
101.190.99.246	AS1221 Telstra Limited	`4.74ms` from Sydney, AU
13.238.58.22	AS16509 Amazon.com, Inc.	`0.14ms` from Sydney, AU
210.69.151.246	AS4782 Data Communication Business Group	`6.95ms` from Taipei, TW
72.61.74.54	AS47583 Hostinger International Limited	`0.72ms` from Boston, US
94.132.67.38	AS2860 NOS COMUNICACOES, S.A.	`7.81ms` from Braga, PT
93.176.81.86	AS31027 GlobalConnect A/S	`0.34ms` from Copenhagen, DK
41.175.45.70	AS30844 Liquid Telecommunications Ltd	`0.74ms` from Johannesburg, ZA
23.44.221.118	AS9299 Philippine Long Distance Telephone Company	`0.11ms` from Manila, PH
75.171.110.230	AS209 CenturyLink Communications, LLC	`7.87ms` from Minneapolis, US
50.240.104.182	AS7922 Comcast Cable Communications, LLC	`11.90ms` from Murfreesboro, US
23.100.104.54	AS8075 Microsoft Corporation	`0.30ms` from Osaka, JP

Traceroute

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

traceroute -a -n -q1 -f2 -m23 178.17.109.255

traceroute to 178.17.109.255 (178.17.109.255): 23 hops max, 52 byte packets

2 [AS35916] 64.69.46.3 0.71 ms

3 *

4 [AS174] 154.54.44.85 10.795 ms

5 [AS174] 154.54.166.57 19.783 ms

6 [AS174] 154.54.165.25 44.834 ms

7 [AS174] 154.54.40.250 37.858 ms

8 [AS174] 154.54.29.133 45.393 ms

9 [AS174] 154.54.169.177 61.483 ms

10 [AS174] 154.54.170.70 66.483 ms

11 [AS174] 154.54.90.98 148.296 ms

12 [AS174] 154.54.43.17 146.736 ms

13 [AS174] 154.54.44.161 146.602 ms

14 [AS174] 154.54.77.245 148.437 ms

15 *

16 *

17 [AS174] 154.54.78.66 166.719 ms

18 [AS174] 149.11.118.5 167.597 ms

19 [AS5610] 90.182.199.221 173.939 ms

20 [AS16246] 188.175.254.237 168.03 ms

21 *

22 *

23 *

Measurement taken from

IPinfo ProbeNet in Los Angeles, US

On January 9th 2026

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What is an ASN?

Autonomous System Numbers (ASNs) are assigned to entities such as Internet Service Providers and other large organizations that control blocks of IP addresses. This network page, and the organization field that's shown on the main IP address information page and also returned in the geolocation API are based on the ASN.

The ASN details will often correspond to the IP address owner, but for smaller organizations it may be that organization's parent, or their ISP. Find out more about AS16246 at robtex.

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