1. All IP Ranges
  2. 81.0.0.0/8
  3. 81.25.0.0/16
  4. AS57728  | 81.25.16.0/21

81.25.16.0/21

AS57728  ·  CEZNET s.r.o.

Need more data or want to access it via API or data downloads? Sign up to get free access

Sign up for free ›

Summary

Country Czechia
Domain ceznet.cz
ASN AS57728
Registry RIPE
ID CEZNET

WHOIS Details

inetnum:        81.25.16.0 - 81.25.20.255
netname:        CEZNET
descr:          CER
country:        CZ
admin-c:        CH13482-RIPE
tech-c:         CH13482-RIPE
status:         ASSIGNED PA
mnt-by:         CEZNET-MNT
created:        2006-02-27T19:16:13Z
last-modified:  2025-09-16T13:21:02Z
source:         RIPE
abuse-email:    dohled@ceznet.cz
abuse-c:        CH13482-RIPE
abuse-org:      ORG-TBS13-RIPE

role:           CEZNET hostmaster
address:        CEZNET s.r.o.
address:        Vilemovska 1602
address:        Tachov
address:        347 01
address:        The Czech Republic
e-mail:         dohled@ceznet.cz
abuse-mailbox:  dohled@ceznet.cz
phone:          +420 211 046 699
admin-c:        MV6352-RIPE
tech-c:         KD4331-RIPE
tech-c:         MJ83172-RIPE
nic-hdl:        CH13482-RIPE
mnt-by:         CEZNET-MNT
created:        2024-01-12T08:23:53Z
last-modified:  2024-01-12T08:25:01Z
source:         RIPE

route:          81.25.16.0/21
origin:         AS57728
descr:          CEZNET s.r.o.
descr:          CER
mnt-by:         CEZNET-MNT
created:        2020-04-09T07:53:05Z
last-modified:  2025-09-16T11:35:02Z
source:         RIPE

Nearby Ranges

BGP prefixes that overlap with 81.25.0.0/16

Range ASN Company Num of IPs
81.25.208.0/20 AS39478 ASFINAG 4,096
81.25.240.0/20 AS51504 AS Telset 4,096
81.25.128.0/20 AS41589 Lux Green Technologies Sarl 4,096
81.25.96.0/20 AS60409 Associazione Vedica 4,096
81.25.192.0/20 AS2914 NTT United Kingdom Ltd 4,096
81.25.160.0/20 AS15943 wilhelm.tel GmbH 4,096
81.25.144.0/20 AS59702 Junet AB 4,096
81.25.224.0/20 AS15595 Skyline Electronics Ltd. 4,096
81.25.176.0/20 AS20963 P/F 20.11.19 4,096
81.25.0.0/20 AS24789 PJSC Rostelecom 4,096
81.25.40.0/21 AS60273 Altanetica S.L. 2,048
81.25.80.0/21 AS39078 GDM Konsult AB 2,048
81.25.32.0/21 AS60273 Altanetica S.L. 2,048
81.25.64.0/22 AS60720 KVIKTEL LLC 1,024
81.25.72.0/22 AS208496 Daily Telecom Mobile s.r.l. 1,024
81.25.76.0/22 AS31257 LIR Limited 1,024
81.25.76.0/23 AS31257 Orion Telecom LLC 512
81.25.78.0/23 AS31257 Orion Telecom LLC 512
81.25.118.0/24 AS41541 swhosting.com 256
81.25.119.0/24 AS41541 swhosting.com 256
81.25.120.0/24 AS41541 swhosting.com 256
81.25.121.0/24 AS41541 swhosting.com 256
81.25.122.0/24 AS41541 swhosting.com 256
81.25.123.0/24 AS41541 swhosting.com 256
81.25.124.0/24 AS41541 swhosting.com 256
81.25.125.0/24 AS41541 swhosting.com 256
81.25.126.0/24 AS41541 swhosting.com 256
81.25.127.0/24 AS41541 swhosting.com 256
81.25.115.0/24 AS41541 swhosting.com 256
81.25.71.0/24 AS47204 MCS LLC 256
81.25.68.0/24 AS47247 Maximum LLC 256
81.25.113.0/24 AS41541 swhosting.com 256
81.25.69.0/24 AS202376 Arvid Logicum OU 256
81.25.70.0/24 AS202104 Server-plus LLC 256
81.25.116.0/24 AS41541 swhosting.com 256
81.25.228.0/24 AS15595 Skyline ISP 256
81.25.117.0/24 AS41541 swhosting.com 256

Hosted domains

There are 37 domain names hosted across 14 IP addresses on this ASN. Checkout our API to access full domain hosting information.

IP Address Domain Domains on this IP
81.25.16.230 sicuropower.cz 20
81.25.16.237 auditpro.eu 2
81.25.16.238 tmspro.cz 2
81.25.16.204 tartarnet.cz 2
81.25.17.115 thorrovydeti.com 2
81.25.21.192 proinco.cz 1
81.25.16.239 boleslavskamedia.cz 1
81.25.21.34 zemnipracetesar.cz 1
81.25.22.12 labits.cz 1
81.25.17.230 pajr.cz 1
81.25.16.202 cetel.cz 1
81.25.19.86 bossmb-vyuka.cz 1
81.25.21.141 chmelik.info 1
81.25.16.231 heliosmb.cz 1

Hosted domains API

Our Hosted Domains API, or Reverse IP API returns a full list of domains that are hosted on a single IP address.
Useful for Cybersecurity
Read more

Pingable IPs

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

IP Address ASN Details
81.25.22.137 AS57728 CEZNET s.r.o. 1.83ms from Prague, CZ
81.25.19.73 AS57728 CEZNET s.r.o. 1.82ms from Prague, CZ
81.25.20.65 AS57728 CEZNET s.r.o. 1.85ms from Prague, CZ
81.25.17.145 AS57728 CEZNET s.r.o. 1.83ms from Prague, CZ
81.25.16.195 AS57728 CEZNET s.r.o. 1.83ms from Prague, CZ
81.25.18.217 AS57728 CEZNET s.r.o. 1.80ms 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
149.143.39.197 AS15435 DELTA Fiber Nederland B.V. 1.60ms from Amsterdam, NL
57.152.16.133 AS8075 Microsoft Corporation 0.64ms from Ashburn, US
69.243.132.69 AS7922 Comcast Cable Communications, LLC 10.89ms from Chicago, US
128.203.193.149 AS8075 Microsoft Corporation 0.15ms from Des Moines, US
37.81.84.101 AS3320 Deutsche Telekom AG 17.15ms from Duesseldorf, DE
81.27.168.37 AS12611 R-KOM Regensburger Telekommunikationsgesellschaft mbH 4.76ms from Frankfurt am Main, DE
187.204.188.149 AS8151 UNINET 0.96ms from Guadalajara, MX
103.161.126.213 AS140775 GLOBAL INFORMATICS TELECOMMUNICATIONS JOINT STOCK COMPANY 0.32ms from Hanoi, VN
116.45.3.69 AS17858 LG POWERCOMM 3.52ms from Incheon, KR
196.44.191.197 AS31856 YoAfrica (Pvt) Ltd 12.19ms from Lusaka, ZM
164.73.76.5 AS1797 Uruguay 5.17ms from Montevideo, UY
100.35.162.181 AS701 Verizon Business 2.43ms from New York City, US
98.113.133.229 AS701 Verizon Business 2.78ms from New York City, US
218.131.34.5 AS17676 SoftBank Corp. 4.37ms from Osaka, JP
103.48.31.101 AS59105 Home NOC Operators Group 0.35ms from Osaka, JP
186.237.50.5 AS263009 FORTE TELECOM LTDA. 1.22ms from Rio de Janeiro, BR
184.71.141.117 AS6327 Shaw Communications 3.84ms from Seattle, US
14.36.143.85 AS4766 Korea Telecom 1.03ms from Seoul, KR
114.199.245.5 AS7623 Gyeongbuk Cable TV 6.75ms from Seoul, KR
185.29.123.21 AS203001 GateX LIMITED 0.40ms from Sofia, BG
124.11.83.85 AS9924 Taiwan Fixed Network, Telco and Network Service Provider. 5.33ms from Taipei, TW
161.53.46.53 AS2108 Croatian Academic and Research Network 2.99ms from Zagreb, HR
39.164.108.37 AS24445 Henan Mobile Communications Co.,Ltd 4.43ms from Zhengzhou, CN
20.237.119.197 AS8075 Microsoft Corporation 0.53ms from Ashburn, US
71.59.31.117 AS7922 Comcast Cable Communications, LLC 4.18ms from Atlanta, US

Traceroute

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

$
traceroute -a -n -q1 -m9 81.25.23.126
traceroute to 81.25.23.126 (81.25.23.126): 9 hops max, 52 byte packets
2 [AS15169] 192.178.98.38 13.856 ms
3 *
4 [AS39791] 89.111.69.3 13.134 ms
7 *
8 *
9 *
Measurement taken from IPinfo ProbeNet in Zuerich, CH
On

What are IP address ranges?

IP address ranges, or netblocks, are groups of related IP addresses. They are usually represented as a base IP address, followed by a slash, and then a netmask which represents how many IP addresses are contained within the netblock. This format is known as CIDR. You'll also sometimes see netblocks given as a start ip address, and an end ip address, or an ip address range.

Traffic works its way around the internet based on the routing table, which contains a list of networks and their associated netblocks.

An API built with users in mind: reliable, accurate, and easy-to-use

Discover why industry-leading companies around the globe love our data. IPinfo's accurate insights fuel use cases from cybersecurity, data enrichment, web personalization, and much more.

Get Started for Free Contact Sales
IPinfo for all your IP geolocation needs

Our IP tools

Explore all tools
What is my IP

What is my IP

Test our data accuracy by viewing insights from your IP address.

See your IP address
Map IPs

Map IPs

Paste up to 500,000 IPs to see where they're located on a map.

Try Map IPs
Summarize IPs

Summarize IPs

Use our data visualization tool to create a visual overview of multiple IPs.

Try Summarize IPs