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 ██████████ 1,000
78.156.158.200 ██████████ 423
78.156.158.194 ██████████ 360
78.156.158.75 █████████ 228
78.156.156.10 ██████████ 129
78.156.158.91 ██████████ 85
78.156.158.74 ██████████ 70
78.156.143.203 ██████████ 37
78.156.158.152 ██████████ 18
78.156.158.72 ██████████ 17

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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
78.156.149.33 AS43542 OptoNet Communication, spol. s.r.o. 2.05ms from Prague, CZ
78.156.152.19 AS43542 OptoNet Communication, spol. s.r.o. 2.41ms from Prague, CZ
78.156.133.217 AS43542 OptoNet Communication, spol. s.r.o. 1.78ms from Prague, CZ
78.156.143.185 AS43542 OptoNet Communication, spol. s.r.o. 1.86ms from Prague, CZ
78.156.159.246 AS43542 OptoNet Communication, spol. s.r.o. 1.83ms from Prague, CZ
78.156.155.68 AS43542 OptoNet Communication, spol. s.r.o. 1.94ms from Prague, CZ
78.156.128.17 AS43542 OptoNet Communication, spol. s.r.o. 1.78ms from Prague, CZ
2a00:d940:3:2000::1 AS43542 OptoNet Communication, spol. s.r.o. 3.01ms from Prague, CZ
2a00:d940:2:4:5442:e852:43cd:5c40 AS43542 OptoNet Communication, spol. s.r.o. 4.76ms from Prague, CZ
78.156.147.236 AS43542 OptoNet Communication, spol. s.r.o. 2.03ms from Prague, CZ
2a00:d940:0:c::2 AS43542 OptoNet Communication, spol. s.r.o. 1.84ms from Prague, CZ
78.156.157.73 AS43542 OptoNet Communication, spol. s.r.o. 1.83ms from Prague, CZ
78.156.137.105 AS43542 OptoNet Communication, spol. s.r.o. 1.83ms from Prague, CZ
78.156.131.249 AS43542 OptoNet Communication, spol. s.r.o. 2.01ms from Prague, CZ
78.156.135.17 AS43542 OptoNet Communication, spol. s.r.o. 1.89ms from Prague, CZ
78.156.150.60 AS43542 OptoNet Communication, spol. s.r.o. 2.67ms from Prague, CZ
78.156.154.1 AS43542 OptoNet Communication, spol. s.r.o. 2.71ms from Prague, CZ
78.156.156.94 AS43542 OptoNet Communication, spol. s.r.o. 1.87ms from Prague, CZ
78.156.144.1 AS43542 OptoNet Communication, spol. s.r.o. 2.75ms from Prague, CZ
78.156.158.161 AS43542 OptoNet Communication, spol. s.r.o. 1.84ms 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
71.25.10.246 AS7922 Comcast Cable Communications, LLC 6.87ms from Ashburn, US
50.229.19.134 AS7922 Comcast Cable Communications, LLC 1.54ms from Atlanta, US
96.70.208.38 AS7922 Comcast Cable Communications, LLC 6.13ms from Boston, US
181.214.10.182 AS140641 YOTTA NETWORK SERVICES PRIVATE LIMITED 1.38ms from Delhi, IN
84.165.249.214 AS3320 Deutsche Telekom AG 4.30ms from Frankfurt am Main, DE
183.165.193.166 AS4134 CHINANET-BACKBONE 10.48ms from Huai'an, CN
18.61.23.70 AS16509 Amazon.com, Inc. 1.49ms from Hyderabad, IN
162.192.45.118 AS7018 AT&T Enterprises, LLC 2.41ms from Los Angeles, US
197.148.10.102 AS36907 TV CABO ANGOLA LDA 7.66ms from Luanda, AO
80.45.184.38 AS13285 TalkTalk Communications Limited 2.66ms from Manchester, GB
208.163.157.54 AS209 CenturyLink Communications, LLC 12.66ms from Miami, US
124.96.67.150 AS4713 NTT DOCOMO BUSINESS,Inc. 3.51ms from Osaka, JP
82.125.194.166 AS3215 Orange S.A. 2.27ms from Paris, FR
34.205.247.86 AS14618 Amazon.com, Inc. 0.19ms from Reston, US
15.158.41.118 AS16509 Amazon.com, Inc. 0.62ms from Reston, US
203.234.169.6 AS4766 Korea Telecom 1.28ms from Seoul, KR
116.14.74.38 AS9506 Singtel Fibre Broadband 1.22ms from Singapore, SG
9.163.219.166 AS8075 Microsoft Corporation 0.24ms from Amsterdam, NL
50.193.94.230 AS7922 Comcast Cable Communications, LLC 5.29ms from Chicago, US
12.149.125.86 AS7018 AT&T Enterprises, LLC 5.47ms from Columbus, US
98.245.195.134 AS7922 Comcast Cable Communications, LLC 2.42ms from Denver, US
45.125.221.246 AS63526 Systems Solutions & development Technologies Limited 1.86ms from Dhaka, BD
68.36.13.230 AS7922 Comcast Cable Communications, LLC 6.91ms from Flint, US
67.187.175.38 AS7922 Comcast Cable Communications, LLC 11.81ms from Fremont, US
113.116.179.134 AS4134 CHINANET-BACKBONE 1.39ms from Guangzhou, CN

Traceroute

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

$
traceroute -a -n -q1 -f2 78.156.131.249
traceroute to 78.156.131.249 (78.156.131.249): 64 hops max, 52 byte packets
2 [] 91.210.17.48 5.028 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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