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

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

IP Address ASN Details
78.156.156.251 AS43542 OptoNet Communication, spol. s.r.o. 1.89ms from Prague, CZ
78.156.154.1 AS43542 OptoNet Communication, spol. s.r.o. 2.60ms from Prague, CZ
78.156.137.9 AS43542 OptoNet Communication, spol. s.r.o. 1.85ms from Prague, CZ
78.156.128.17 AS43542 OptoNet Communication, spol. s.r.o. 1.81ms from Prague, CZ
78.156.143.197 AS43542 OptoNet Communication, spol. s.r.o. 1.88ms from Prague, CZ
2a00:d940:0:b::3 AS43542 OptoNet Communication, spol. s.r.o. 1.88ms from Prague, CZ
78.156.147.236 AS43542 OptoNet Communication, spol. s.r.o. 2.01ms from Prague, CZ
2a00:d940:3:2000::1 AS43542 OptoNet Communication, spol. s.r.o. 2.95ms from Prague, CZ
78.156.144.20 AS43542 OptoNet Communication, spol. s.r.o. 2.75ms from Prague, CZ
78.156.155.68 AS43542 OptoNet Communication, spol. s.r.o. 1.92ms from Prague, CZ
78.156.133.144 AS43542 OptoNet Communication, spol. s.r.o. 1.80ms from Prague, CZ
78.156.159.246 AS43542 OptoNet Communication, spol. s.r.o. 1.88ms from Prague, CZ
78.156.152.19 AS43542 OptoNet Communication, spol. s.r.o. 2.39ms from Prague, CZ
78.156.135.105 AS43542 OptoNet Communication, spol. s.r.o. 1.89ms from Prague, CZ
78.156.157.73 AS43542 OptoNet Communication, spol. s.r.o. 1.86ms from Prague, CZ
78.156.131.249 AS43542 OptoNet Communication, spol. s.r.o. 1.99ms from Prague, CZ
78.156.158.161 AS43542 OptoNet Communication, spol. s.r.o. 1.82ms from Prague, CZ
78.156.149.33 AS43542 OptoNet Communication, spol. s.r.o. 2.06ms from Prague, CZ
78.156.150.121 AS43542 OptoNet Communication, spol. s.r.o. 2.74ms 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
168.29.159.6 AS3479 Board of Regents of the University System of Georgia 1.44ms from Atlanta, US
76.118.7.86 AS7922 Comcast Cable Communications, LLC 7.62ms from Boston, US
197.162.215.118 AS24863 Link Egypt (Link.NET) 7.94ms from Cairo, EG
35.192.226.214 AS396982 Google LLC 0.15ms from Council Bluffs, US
82.82.147.246 AS3209 Vodafone GmbH 6.52ms from Duesseldorf, DE
84.165.249.214 AS3320 Deutsche Telekom AG 4.35ms from Frankfurt am Main, DE
185.82.18.22 AS15943 wilhelm.tel GmbH 0.48ms from Hamburg, DE
169.50.223.150 AS36351 IBM Cloud 1.18ms from London, GB
86.24.234.198 AS5089 Virgin Media Limited 7.94ms from London, GB
47.137.23.70 AS5650 Frontier Communications of America, Inc. 5.10ms from Los Angeles, US
162.192.45.118 AS7018 AT&T Enterprises, LLC 2.58ms from Los Angeles, US
199.19.204.150 AS27589 MOJOHOST 0.17ms from Miami, US
69.202.185.6 AS12271 Charter Communications Inc 4.36ms from New York City, US
161.153.135.198 AS31898 Oracle Corporation 1.08ms from Phoenix, US
34.205.208.70 AS14618 Amazon.com, Inc. 0.24ms from Reston, US
210.150.108.134 AS2514 NTT PC Communications, Inc. 3.83ms from Tokyo, JP
112.46.237.22 AS9808 China Mobile Communications Group Co., Ltd. 0.54ms from Xi'an, CN
23.57.46.246 AS16625 Akamai Technologies, Inc. 0.25ms from Bengaluru, IN
130.248.127.22 AS58664 ADOBE-NET-INFRA 0.73ms from Bengaluru, IN
89.152.116.150 AS2860 NOS COMUNICACOES, S.A. 7.38ms from Braga, PT
24.209.52.22 AS10796 Charter Communications Inc 4.69ms from Cleveland, US
93.211.173.70 AS3320 Deutsche Telekom AG 2.40ms from Duesseldorf, DE
175.121.81.150 AS9318 SK Broadband Co Ltd 7.00ms from Incheon, KR
82.17.225.118 AS5089 Virgin Media Limited 4.58ms from London, GB
85.32.207.38 AS3269 Telecom Italia S.p.A. 7.34ms 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 -f3 78.156.137.145
traceroute to 78.156.137.145 (78.156.137.145): 64 hops max, 52 byte packets
3 [] 91.210.17.48 2.792 ms
4 *
5 *
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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