Autonomous System details

AS43757

ICZ a.s.  ·  i.cz

Czechia

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AS43757 – ICZ a.s.

Field Value
Country Czechia
Website i.cz
Hosted domains 84
IPv4 addresses 2,304
IPv6 addresses 1,208,925,819,614,629,174,706,176
ASN type Business
Registry ripe
Allocated 18 years ago on Sep 24, 2007
Updated 4 months ago on Oct 02, 2025

IP Ranges

Netblock Company Num of IPs
78.31.24.0/21 ICZ a.s. 2,048
192.108.126.0/24 ICZ a.s. 256
Netblock Company
2001:67c:1578::/48 ICZ a.s.
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WHOIS Details

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                                                ASHandle:       AS43757
                                                OrgID:          AS43757
                                                ASName:         AS43757
                                                ASNumber:       AS43757
                                                RegDate:        0000-00-00
                                                Updated:        0000-00-00
                                                TechHandle:     AA00-AAAA
                                                Source:         AAAA
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Hosted Domains

There are 84 domain names hosted across 3 IP addresses on this ASN.

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IP Address Domain Domains on this IP
78.31.26.115 ██████████ 76
78.31.27.181 ██████████ 10
78.31.27.187 ████████ 1

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Peers

There are 3 peers for this ASN.

Peers Name
AS5578 SWAN, a.s.
AS5610 O2 Czech Republic, a.s.
AS6855 Slovak Telekom, a.s.
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ASN API & Database

Upstreams

There are 3 upstreams for this ASN.

upstreams Name
AS5578 SWAN, a.s.
AS5610 O2 Czech Republic, a.s.
AS6855 Slovak Telekom, a.s.
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ASN API & Database

Downstreams

There are no downstreams for this ASN.

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ASN API & Database

Pingable IPs

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

IP Address ASN Details
78.31.29.1 AS43757 ICZ a.s. 1.31ms from Prague, CZ
78.31.25.1 AS43757 ICZ a.s. 1.17ms from Prague, CZ
192.108.126.3 AS43757 ICZ a.s. 2.33ms from Bratislava, SK
78.31.24.2 AS43757 ICZ a.s. 0.99ms from Prague, CZ
78.31.27.249 AS43757 ICZ a.s. 1.20ms from Prague, CZ
78.31.26.66 AS43757 ICZ a.s. 1.19ms from Prague, CZ
78.31.31.254 AS43757 ICZ a.s. 1.29ms from Prague, CZ
2001:67c:1578:8101:0:1:0:2 AS43757 ICZ a.s. 1.15ms 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
99.164.83.221 AS7018 AT&T Enterprises, LLC 7.62ms from Atlanta, US
178.148.38.253 AS31042 Serbia BroadBand-Srpske Kablovske mreze d.o.o. 5.30ms from Belgrade, RS
178.26.20.253 AS3209 Vodafone GmbH 5.83ms from Berlin, DE
185.170.29.253 AS201455 any.cloud A/S 0.41ms from Copenhagen, DK
184.186.141.221 AS22773 Cox Communications Inc. 5.74ms from Dallas, US
83.136.46.157 AS13280 Three Ireland (Hutchison) limited 0.66ms from Dublin, IE
217.93.207.45 AS3320 Deutsche Telekom AG 3.43ms from Duesseldorf, DE
183.245.66.13 AS56041 China Mobile communications corporation 9.53ms from Hangzhou, CN
221.210.25.61 AS4837 CHINA UNICOM China169 Backbone 6.46ms from Harbin, CN
221.140.54.157 AS9318 SK Broadband Co Ltd 1.45ms from Incheon, KR
94.5.225.173 AS5607 Sky UK Limited 12.79ms from London, GB
115.203.117.157 AS4134 CHINANET-BACKBONE 7.70ms from Ningbo, CN
95.189.202.221 AS12389 PJSC Rostelecom 8.31ms from Novosibirsk, RU
125.8.146.93 AS9824 JCOM Co., Ltd. 9.56ms from Osaka, JP
64.121.164.93 AS6079 RCN 5.99ms from Philadelphia, US
188.123.141.125 AS35805 JSC "Silknet" 5.26ms from Tbilisi, GE
35.245.214.93 AS396982 Google LLC 0.14ms from Ashburn, US
163.252.9.173 AS13977 Fidium 7.56ms from Boston, US
85.115.209.253 AS64267 Sprious LLC 0.14ms from Frankfurt am Main, DE
217.231.230.189 AS3320 Deutsche Telekom AG 3.25ms from Hamburg, DE
93.192.77.45 AS3320 Deutsche Telekom AG 5.41ms from Hamburg, DE
86.186.169.221 AS2856 British Telecommunications PLC 2.21ms from London, GB
153.244.112.253 AS4713 NTT DOCOMO BUSINESS,Inc. 9.84ms from Osaka, JP
73.241.89.29 AS7922 Comcast Cable Communications, LLC 6.29ms from San Jose, US
220.117.228.157 AS4766 Korea Telecom 1.53ms from Seoul, KR

Traceroute

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

$
traceroute -a -n -q1 -f3 78.31.25.66
traceroute to 78.31.25.66 (78.31.25.66): 64 hops max, 52 byte packets
3 [] 91.210.16.23 1.469 ms
4 *
6 [AS43757] 78.31.25.66 2.664 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 AS43757 at robtex.

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