Autonomous System details

AS43757

ICZ a.s.  ·  i.cz

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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
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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IP Ranges API

WHOIS Details


                                                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.

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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Useful for Cybersecurity

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.
Get this data and more insights on related domains, allocation dates, registry names, IP counts with IPinfo's IP-to-ASN product.

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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Downstreams

There are no downstreams for this ASN.

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Pingable IPs

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

IP Address ASN Details
2001:67c:1578:8101:0:1:0:2 AS43757 ICZ a.s. 1.15ms from Prague, CZ
78.31.24.2 AS43757 ICZ a.s. 0.99ms from Prague, CZ
192.108.126.3 AS43757 ICZ a.s. 2.33ms from Bratislava, SK
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
78.31.25.1 AS43757 ICZ a.s. 1.17ms from Prague, CZ
78.31.29.1 AS43757 ICZ a.s. 1.31ms 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
178.156.178.125 AS213230 Hetzner Online GmbH 0.19ms from Ashburn, US
216.59.33.29 AS15085 Immedion, LLC 0.12ms from Asheville, US
101.51.166.109 AS23969 TOT Public Company Limited 3.05ms from Bangkok, TH
123.119.185.45 AS4808 China Unicom Beijing Province Network 3.46ms from Beijing, CN
117.128.81.141 AS56048 China Mobile Communicaitons Corporation 1.96ms from Beijing, CN
134.245.40.253 AS680 Verein zur Foerderung eines Deutschen Forschungsnetzes e.V. 7.54ms from Berlin, DE
20.22.107.253 AS8075 Microsoft Corporation 0.28ms from Boydton, US
108.66.191.157 AS7018 AT&T Enterprises, LLC 2.36ms from Dallas, US
36.133.186.77 AS9808 China Mobile Communications Group Co., Ltd. 3.18ms from Guangzhou, CN
110.39.15.253 AS38264 National WiMAX/IMS environment 0.61ms from Karachi, PK
69.128.106.109 AS4181 TDS TELECOM 4.01ms from Monticello, US
15.222.181.189 AS16509 Amazon.com, Inc. 0.10ms from Montreal, CA
86.62.116.253 AS31363 JSC ER-Telecom Holding 0.97ms from Moscow, RU
34.97.161.205 AS396982 Google LLC 0.11ms from Osaka, JP
123.226.19.189 AS4713 NTT DOCOMO BUSINESS,Inc. 6.40ms from Osaka, JP
187.101.215.189 AS27699 TELEFÔNICA BRASIL S.A 3.29ms from Osasco, BR
178.164.122.173 AS34087 NTE TELEKOM AS 7.62ms from Oslo, NO
85.207.17.93 AS25248 RADIOKOMUNIKACE a.s. 0.41ms from Prague, CZ
34.200.43.205 AS14618 Amazon.com, Inc. 0.22ms from Reston, US
52.78.143.109 AS16509 Amazon.com, Inc. 0.19ms from Seoul, KR
149.202.40.61 AS16276 OVH SAS 0.14ms from Strasbourg, FR
153.198.131.45 AS4713 NTT DOCOMO BUSINESS,Inc. 7.41ms from Tokyo, JP
37.140.6.189 AS8369 Intersvyaz-2 JSC 8.15ms from Yekaterinburg, RU
171.15.65.141 AS4134 CHINANET-BACKBONE 10.13ms from Zhengzhou, CN
94.168.99.61 AS33915 Vodafone Libertel B.V. 5.64ms from Amsterdam, NL

Traceroute

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

$
traceroute -a -n -q1 -f3 78.31.29.21
traceroute to 78.31.29.21 (78.31.29.21): 64 hops max, 52 byte packets
3 [] 91.210.16.23 1.478 ms
4 *
6 [AS43757] 78.31.24.54 2.431 ms
7 [AS43757] 78.31.29.21 2.511 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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