Autonomous System details

AS43542

OptoNet Communication, spol. s.r.o.  ·  optonet.cz

Czechia

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AS43542 – OptoNet Communication, spol. s.r.o.

Field Value
Country Czechia
Website optonet.cz
Hosted domains 2,415
IPv4 addresses 8,192
IPv6 addresses 79,228,162,514,264,338,000,000,000,000
ASN type ISP
Registry ripe
Allocated 19 years ago on Aug 20, 2007
Updated a month ago on Mar 16, 2026

IP Ranges

Netblock Company Num of IPs
78.156.128.0/19 OptoNet Communication, spol. s.r.o. 8,192
Netblock Company
2a00:d940::/32 OptoNet Communication, spol. s.r.o.
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WHOIS Details

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                                                ASHandle:       AS43542
                                                OrgID:          AS43542
                                                ASName:         AS43542
                                                ASNumber:       AS43542
                                                RegDate:        0000-00-00
                                                Updated:        0000-00-00
                                                TechHandle:     AA00-AAAA
                                                Source:         AAAA
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Hosted Domains

There are 2,415 domain names hosted across 58 IP addresses on this ASN.

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IP Address Domain Domains on this IP
78.156.158.199 ██████████ 922
78.156.158.200 ██████████ 446
78.156.158.194 ██████████ 334
78.156.158.75 █████████ 219
78.156.156.10 ██████████ 113
78.156.158.91 ██████████ 74
78.156.158.74 ██████████ 69
78.156.143.203 ████████ 35
78.156.158.72 ██████████ 15
78.156.135.74 ███████ 15

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Peers

There are 32 peers for this ASN.

Peers Name
AS14840 BR.Digital Telecom
AS16019 Vodafone Czech Republic a.s.
AS1764 Next Layer Telekommunikationsdienstleistungs- und Beratungs GmbH
AS198150 SIACOM JSC
AS202979 NGA Services, spol. s r.o.
AS207945 CNI Group s.r.o.
AS21215 UNITED GROUP NETWORK INFRASTRUCTURE d.o.o. Beograd
AS212483 LEVEL EIGHTY-SIX COMMUNICATIONS LTD
AS22356 Durand do Brasil Ltda
AS24482 SG.GS
AS24940 Hetzner Online GmbH
AS263444 Open X Tecnologia Ltda
AS29504 Freenet Liberec, z.s.
AS32590 Valve Corporation
AS36236 NetActuate, Inc
AS39120 Convergenze S.p.A.
AS40994 Hohl IT e.U.
AS43733 Viva Armenia CJSC
AS44104 LCJ Invest, a.s.
AS44306 OMONIA d.o.o.
AS4455 IX Reach Ltd
AS47200 NIX.CZ z.s.p.o.
AS48091 Kraj Vysocina
AS49544 i3D.net B.V
AS51184 Fonira Telekom GmbH
AS57463 NetIX Communications JSC
AS6204 INTERKVM HOST SRL
AS6663 Euroweb Romania S.R.L.
AS6855 Slovak Telekom, a.s.
AS6881 NIX.CZ z.s.p.o.
AS6939 Hurricane Electric LLC
AS8218 Zayo Infrastructure France SA
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Upstreams

There are 3 upstreams for this ASN.

upstreams Name
AS16019 Vodafone Czech Republic a.s.
AS6855 Slovak Telekom, a.s.
AS6939 Hurricane Electric LLC
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Downstreams

There are 4 downstreams for this ASN.

Downstreams Name
AS202979 NGA Services, spol. s r.o.
AS207945 CNI Group s.r.o.
AS44104 LCJ Invest, a.s.
AS48091 Kraj Vysocina
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Pingable IPs

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

IP Address ASN Details
78.156.144.20 AS43542 OptoNet Communication, spol. s.r.o. 2.72ms from Prague, CZ
78.156.137.65 AS43542 OptoNet Communication, spol. s.r.o. 1.83ms from Prague, CZ
78.156.147.236 AS43542 OptoNet Communication, spol. s.r.o. 2.02ms from Prague, CZ
2a00:d940:2:2:c000:: AS43542 OptoNet Communication, spol. s.r.o. 2.20ms from Prague, CZ
78.156.135.41 AS43542 OptoNet Communication, spol. s.r.o. 1.89ms from Prague, CZ
78.156.133.144 AS43542 OptoNet Communication, spol. s.r.o. 1.78ms from Prague, CZ
78.156.143.100 AS43542 OptoNet Communication, spol. s.r.o. 1.88ms from Prague, CZ
78.156.157.73 AS43542 OptoNet Communication, spol. s.r.o. 1.83ms from Prague, CZ
2a00:d940:0:b::3 AS43542 OptoNet Communication, spol. s.r.o. 1.84ms from Prague, CZ
78.156.128.17 AS43542 OptoNet Communication, spol. s.r.o. 1.81ms from Prague, CZ
78.156.131.249 AS43542 OptoNet Communication, spol. s.r.o. 1.97ms from Prague, CZ
78.156.156.1 AS43542 OptoNet Communication, spol. s.r.o. 1.86ms from Prague, CZ
78.156.155.13 AS43542 OptoNet Communication, spol. s.r.o. 1.90ms from Prague, CZ
78.156.150.60 AS43542 OptoNet Communication, spol. s.r.o. 2.71ms from Prague, CZ
78.156.149.33 AS43542 OptoNet Communication, spol. s.r.o. 2.04ms from Prague, CZ
2a00:d940:3:2000::1 AS43542 OptoNet Communication, spol. s.r.o. 3.04ms from Prague, CZ
78.156.159.238 AS43542 OptoNet Communication, spol. s.r.o. 1.87ms from Prague, CZ
78.156.158.161 AS43542 OptoNet Communication, spol. s.r.o. 1.83ms from Prague, CZ
78.156.154.1 AS43542 OptoNet Communication, spol. s.r.o. 3.85ms from Prague, CZ
78.156.152.19 AS43542 OptoNet Communication, spol. s.r.o. 2.40ms 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
24.31.229.118 AS11427 Charter Communications Inc 15.87ms from Dallas, US
187.64.116.150 AS28573 Claro NXT Telecomunicacoes Ltda 17.86ms from Fortaleza, BR
27.117.238.70 AS9756 SK Broadband Co Ltd 2.48ms from Incheon, KR
188.190.58.246 AS49332 Lanet Network Ltd 7.16ms from Kyiv, UA
97.218.143.134 AS6167 Verizon Business 10.82ms from Los Angeles, US
102.158.89.38 AS37705 TOPNET 16.25ms from Marseille, FR
92.153.205.182 AS3215 Orange S.A. 9.48ms from Paris, FR
177.81.148.6 AS28573 Claro NXT Telecomunicacoes Ltda 6.72ms from Sao Paulo, BR
220.91.204.22 AS4766 Korea Telecom 2.03ms from Seoul, KR
112.176.121.38 AS4766 Korea Telecom 4.97ms from Seoul, KR
118.169.142.118 AS3462 Data Communication Business Group 2.77ms from Taipei, TW
86.84.187.70 AS1136 KPN B.V. 1.33ms from Amsterdam, NL
107.142.216.22 AS7018 AT&T Enterprises, LLC 11.00ms from Atlanta, US
79.101.173.54 AS8400 TELEKOM SRBIJA a.d. 1.07ms from Belgrade, RS
35.230.225.102 AS396982 Google LLC 0.22ms from Chang-hua, TW
222.243.220.22 AS4134 CHINANET BACKBONE 6.71ms from Changsha, CN
77.33.137.150 AS44869 FIBIA P/S 2.38ms from Copenhagen, DK
68.96.44.134 AS22773 Cox Communications Inc. 12.35ms from Dallas, US
122.177.169.54 AS24560 Bharti Airtel Ltd., Telemedia Services 5.96ms from Delhi, IN
115.10.110.182 AS4766 Korea Telecom 5.89ms from Incheon, KR
39.46.146.86 AS17557 Pakistan Telecommunication Company Limited 11.33ms from Islamabad, PK
113.58.27.134 AS4837 CHINA UNICOM China169 Backbone 11.60ms from Liuzhou, CN
86.183.233.230 AS2856 British Telecommunications PLC 14.98ms from London, GB
97.221.156.198 AS6167 Verizon Business 13.91ms from Miami, US
79.40.7.246 AS3269 Telecom Italia S.p.A. 9.03ms from Milan, IT

Traceroute

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

$
traceroute -a -n -q1 -f4 78.156.149.8
traceroute to 78.156.149.8 (78.156.149.8): 64 hops max, 52 byte packets
4 [] 91.210.17.48 8.33 ms
5 *
6 *
7 *
10 [AS43542] 78.156.149.8 5.495 ms
Measurement taken from IPinfo ProbeNet in Prague, CZ
On

Related Networks

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 AS43542 at robtex.

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