Autonomous System details

AS204666

Jiri Tlapak · tlapnet.cz

Czechia

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AS204666 – Jiri Tlapak

Field	Value
Country	Czechia
Website	tlapnet.cz
Hosted domains	661
IPv4 addresses	15,104
IPv6 addresses	4,516,006,472,238,886,852,629,200,000,000
ASN type	ISP
Registry	ripe
Allocated	8 years ago on Jan 29, 2018
Updated	a year ago on Mar 25, 2025

Netblock	Company	Num of IPs
37.221.240.0/20	ISP Alliance a.s.	4,096
45.153.192.0/22	ISP Alliance a.s.	1,024
85.255.88.0/22	ISP Alliance a.s.	1,024
185.19.0.0/22	ISP Alliance a.s.	1,024
185.64.220.0/22	ISP Alliance a.s.	1,024
185.87.140.0/22	Jiri Tlapak	1,024
185.97.24.0/22	ISP Alliance a.s.	1,024
185.230.172.0/22	Jiri Tlapak	1,024
185.243.172.0/22	Jiri Tlapak	1,024
5.59.102.0/23	IT Globe s.r.o.	512
91.224.90.0/23	Livady s.r.o.	512
185.87.142.0/23	Jiri Tlapak	512
213.108.162.0/23	ISP Alliance a.s.	512
37.221.241.0/24	Caslav - Tlapnet s.r.o.	256
37.221.242.0/24	Caslav - Tlapnet s.r.o.	256
37.221.243.0/24	Caslav - Tlapnet s.r.o.	256
37.221.245.0/24	Policka - Tlapnet s.r.o.	256
37.221.247.0/24	Policka and Rychnov nad Kneznou - Tlapnet s.r.o.	256
37.221.248.0/24	Prelouc - Tlapnet s.r.o.	256
37.221.249.0/24	Prelouc - Tlapnet s.r.o.	256
37.221.250.0/24	Svetla nad Sazavou - Tlapnet s.r.o.	256
37.221.251.0/24	Svetla nad Sazavou - Tlapnet s.r.o.	256
37.221.252.0/24	Golcuv Jenikov - Tlapnet s.r.o.	256
45.153.192.0/24	ISP Alliance a.s.	256
45.153.194.0/24	ISP Alliance a.s.	256
45.153.195.0/24	ISP Alliance a.s.	256
176.119.192.0/24	Jiri Tlapak	256
185.64.220.0/24	core routers and so on of GS-NET s.r.o.	256
185.64.222.0/24	client usage	256
185.74.60.0/24	Tlapnet s.r.o.	256
185.97.24.0/24	STEN.cz s.r.o.	256
185.97.25.0/24	STEN.cz s.r.o.	256
185.97.26.0/24	STEN.cz s.r.o.	256
185.188.100.0/24	TrojanoviceNET s.r.o.	256
185.188.101.0/24	Tlapnet s.r.o.	256
185.188.103.0/24	Tlapnet s.r.o.	256
213.108.162.0/24	ISP Alliance a.s.	256

Netblock	Company
2a04:c740::/29	ISP Alliance a.s.
2a04:f940::/29	ISP Alliance a.s.
2a05:aa00::/29	Jiri Tlapak
2a0a:10c0::/29	ISP Alliance a.s.
2a0d:1880::/29	Jiri Tlapak
2a0f:9300::/29	ISP Alliance a.s.
2a0f:fec0::/29	Jiri Tlapak
2a03:d840::/32	ISP Alliance a.s.
2a03:d840:fe02::/48	ISP Alliance a.s.

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WHOIS Details

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                                                ASHandle:       AS204666
                                                OrgID:          AS204666
                                                ASName:         AS204666
                                                ASNumber:       AS204666
                                                RegDate:        0000-00-00
                                                Updated:        0000-00-00
                                                TechHandle:     AA00-AAAA
                                                Source:         AAAA

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Hosted Domains

There are 661 domain names hosted across 137 IP addresses on this ASN.

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IP Address	Domain	Domains on this IP
91.224.90.13	██████████	84
5.59.102.15	██████████	41
5.59.102.14	██████████	40
91.224.90.10	██████████	36
91.224.90.36	██████████	28
185.64.221.200	██████████	22
37.221.254.200	██████████	17
91.224.90.54	██████████	17
91.224.90.152	██████████	17
37.221.240.35	██████████	16

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Peers

There are 4 peers for this ASN.

Peers	Name
AS16019	Vodafone Czech Republic a.s.
AS197412	Jiri Tlapak
AS210436	IT Globe s.r.o.
AS47232	ISP Alliance a.s.

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ASN API & Database

Upstreams

There are 2 upstreams for this ASN.

upstreams	Name
AS16019	Vodafone Czech Republic a.s.
AS47232	ISP Alliance a.s.

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ASN API & Database

Downstreams

There are 2 downstreams for this ASN.

Downstreams	Name
AS197412	Jiri Tlapak
AS210436	IT Globe s.r.o.

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ASN API & Database

Pingable IPs

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

IP Address	ASN	Details
37.221.253.185	AS204666 Jiri Tlapak	`0.38ms` from Prague, CZ
5.59.102.20	AS204666 Jiri Tlapak	`0.46ms` from Prague, CZ
185.19.1.1	AS204666 Jiri Tlapak	`2.98ms` from Prague, CZ
2a03:d840:fff:f000:9209:d0ff:fe87:1d3	AS204666 Jiri Tlapak	`9.54ms` from Prague, CZ
85.255.90.193	AS204666 Jiri Tlapak	`0.37ms` from Prague, CZ
37.221.242.221	AS204666 Jiri Tlapak	`0.45ms` from Prague, CZ
37.221.248.5	AS204666 Jiri Tlapak	`4.11ms` from Prague, CZ
91.224.90.14	AS204666 Jiri Tlapak	`0.41ms` from Prague, CZ
37.221.246.1	AS204666 Jiri Tlapak	`0.39ms` from Prague, CZ
185.97.24.5	AS204666 Jiri Tlapak	`2.48ms` from Prague, CZ
185.19.0.193	AS204666 Jiri Tlapak	`1.86ms` from Prague, CZ
185.188.100.1	AS204666 Jiri Tlapak	`7.15ms` from Prague, CZ
185.64.221.203	AS204666 Jiri Tlapak	`0.47ms` from Prague, CZ
185.243.173.9	AS204666 Jiri Tlapak	`0.31ms` from Prague, CZ
176.119.192.129	AS204666 Jiri Tlapak	`0.34ms` from Prague, CZ
2a04:c740:ffff:ffa3::1	AS204666 Jiri Tlapak	`0.34ms` from Prague, CZ
37.221.244.26	AS204666 Jiri Tlapak	`3.75ms` from Prague, CZ
185.64.223.130	AS204666 Jiri Tlapak	`2.31ms` from Prague, CZ
185.188.103.129	AS204666 Jiri Tlapak	`0.59ms` from Prague, CZ
37.221.240.61	AS204666 Jiri Tlapak	`0.35ms` from Prague, CZ
185.87.142.66	AS204666 Jiri Tlapak	`1.57ms` from Prague, CZ
185.87.140.57	AS204666 Jiri Tlapak	`3.26ms` from Prague, CZ
45.153.194.17	AS204666 Jiri Tlapak	`0.25ms` from Prague, CZ
185.97.25.23	AS204666 Jiri Tlapak	`2.74ms` from Prague, CZ
37.221.252.10	AS204666 Jiri Tlapak	`1.45ms` 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
20.232.218.186	AS8075 Microsoft Corporation	`0.33ms` from Ashburn, US
3.16.95.122	AS16509 Amazon.com, Inc.	`0.10ms` from Columbus, US
34.243.54.250	AS16509 Amazon.com, Inc.	`0.24ms` from Dublin, IE
86.243.190.202	AS3215 Orange S.A.	`6.31ms` from Frankfurt am Main, DE
189.168.81.58	AS8151 UNINET	`5.31ms` from Guadalajara, MX
111.29.51.90	AS9808 China Mobile Communications Group Co., Ltd.	`13.16ms` from Guangzhou, CN
103.87.155.106	AS4787 PT Cyberindo Aditama	`0.39ms` from Jakarta, ID
20.164.204.218	AS8075 Microsoft Corporation	`0.19ms` from Johannesburg, ZA
13.43.50.10	AS16509 Amazon.com, Inc.	`0.17ms` from London, GB
128.232.26.10	AS786 Jisc Services Limited	`2.37ms` from London, GB
79.62.5.90	AS3269 Telecom Italia S.p.A.	`6.61ms` from Milan, IT
3.108.137.58	AS16509 Amazon.com, Inc.	`0.14ms` from Mumbai, IN
124.135.166.26	AS4837 CHINA UNICOM China169 Backbone	`7.00ms` from Qingdao, CN
128.83.5.250	AS18 University of Texas at Austin	`5.27ms` from San Antonio, US
1.168.67.250	AS3462 Data Communication Business Group	`1.36ms` from Taichung, TW
20.78.228.170	AS8075 Microsoft Corporation	`0.15ms` from Tokyo, JP
42.229.93.42	AS4837 CHINA UNICOM China169 Backbone	`3.46ms` from Zhengzhou, CN
68.220.218.250	AS8075 Microsoft Corporation	`0.24ms` from Boydton, US
141.134.21.10	AS6848 Telenet BV	`7.65ms` from Brussels, BE
103.171.96.186	AS9430 Software Technology Parks of India,Block-IV	`5.72ms` from Delhi, IN
124.51.107.154	AS17858 LG POWERCOMM	`1.53ms` from Incheon, KR
218.158.183.42	AS4766 Korea Telecom	`3.49ms` from Incheon, KR
23.61.82.10	AS16625 Akamai Technologies, Inc.	`0.11ms` from Istanbul, TR
189.91.222.234	AS10938 AGENCIA ESTADUAL DE TECNOLOGIA DA INFORMACAO - ATI	`3.59ms` from Joao Pessoa, BR
141.8.128.154	AS13238 YANDEX LLC	`2.93ms` from Moscow, RU

Traceroute

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

traceroute -a -n -q1 -f4 37.221.249.146

traceroute to 37.221.249.146 (37.221.249.146): 64 hops max, 52 byte packets

4 [AS16019] 213.192.1.6 0.565 ms

5 *

6 [AS204666] 45.153.194.187 6.076 ms

7 *

8 *

9 *

10 [AS204666] 37.221.249.130 6.555 ms

11 [AS204666] 37.221.249.146 6.759 ms

Measurement taken from

IPinfo ProbeNet in Prague, CZ

On April 24th 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 AS204666 at robtex.

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