81.0.204.0/23

AS21430 · WIA spol. s.r.o.

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Summary

Country	Czechia
Domain	casablanca.cz
ASN	AS21430
Registry	RIPE
ID	PRAHA9-NET

WHOIS Details

inetnum:        81.0.204.0 - 81.0.204.255
netname:        PRAHA9-NET
descr:          Prague9 wifi access
country:        CZ
admin-c:        CASA3-RIPE
tech-c:         CASA3-RIPE
status:         ASSIGNED PA
created:        2009-09-30T07:11:34Z
last-modified:  2020-11-18T14:26:02Z
source:         RIPE
mnt-by:         CASABLANCA-RIPE-MNT
mnt-by:         WIA-AS-MNT
abuse-email:    abuse@wia.cz
abuse-c:        WAC9-RIPE
abuse-org:      ORG-Wss1-RIPE

role:           Casablanca INT RIPE manager
address:        Casablanca INT
address:        Vinohradska 184, Prague 3 - 130 52
address:        Czech republic
phone:          +420 270 000 270
fax-no:         +420 270 000 277
e-mail:         hostmaster@casablanca.cz
abuse-mailbox:  abuse@casablanca.cz
admin-c:        JH1771-RIPE
tech-c:         JH1771-RIPE
notify:         hostmaster@casablanca.cz
nic-hdl:        CASA3-RIPE
created:        2005-09-05T10:42:10Z
last-modified:  2015-07-03T11:19:49Z
source:         RIPE
mnt-by:         CASABLANCA-CORE-MNT

route:          81.0.204.0/23
descr:          CASA to WIA transfer
origin:         AS21430
mnt-by:         CASABLANCA-CORE-MNT
mnt-by:         WIA-AS-MNT
created:        2019-09-03T22:31:57Z
last-modified:  2019-09-03T22:31:57Z
source:         RIPE

Nearby Ranges

BGP prefixes that overlap with 81.0.0.0/16

Range	ASN	Company	Num of IPs
81.0.0.0/18	AS15704	XTRA TELECOM S.A.	16,384
81.0.128.0/18	AS2116	GLOBALCONNECT AS	16,384
81.0.192.0/22	AS15685	CASABLANCA INT a.s.	1,024
81.0.248.0/23	AS51167	Contabo GmbH	512
81.0.124.0/23	AS12301	Invitech ICT Services Kft.	512
81.0.88.0/23	AS12301	Invitech ICT Services Kft.	512
81.0.96.0/23	AS12301	Invitech ICT Services Kft.	512
81.0.254.0/23	AS15685	CASABLANCA INT a.s.	512
81.0.242.0/23	AS204383	CASABLANCA INT a.s.	512
81.0.108.0/23	AS20845	DIGI - INVITEL pool	512
81.0.122.0/23	AS20845	DIGI - INVITEL pool	512
81.0.126.0/23	AS20845	DIGI - INVITEL pool	512
81.0.98.0/23	AS20845	DIGI - INVITEL pool	512
81.0.210.0/23	AS21430	WIA spol. s.r.o.	512
81.0.244.0/23	AS21430	WIA spol. s.r.o.	512
81.0.218.0/23	AS51167	Contabo GmbH	512
81.0.220.0/23	AS51167	Contabo GmbH	512
81.0.246.0/23	AS51167	Contabo GmbH	512
81.0.229.0/24	AS21430	WIA spol. s.r.o.	256
81.0.68.0/24	AS12301	Egomnet Kft.	256
81.0.119.0/24	AS12301	Data center	256
81.0.104.0/24	AS12301	Datacenter Hosting Internet	256
81.0.97.0/24	AS12301	Net-Tech Consulting Kft.	256
81.0.67.0/24	AS12301	Euroweb Internet Service Provider	256
81.0.199.0/24	AS15685	CASABLANCA INT a.s.	256
81.0.217.0/24	AS15685	CASABLANCA INT a.s.	256
81.0.226.0/24	AS15685	NETHOST s.r.o.	256
81.0.228.0/24	AS15685	CASABLANCA INT a.s.	256
81.0.250.0/24	AS15685	CASABLANCA INT a.s.	256
81.0.227.0/24	AS21430	WIA spol. s.r.o.	256
81.0.124.0/24	AS12301	Deploy Is Kft.	256
81.0.230.0/24	AS204383	CASABLANCA INT a.s.	256

Hosted domains

There is 1 domain name hosted across 1 IP address on this ASN. Checkout our API to access full domain hosting information.

IP Address	Domain	Domains on this IP
81.0.204.122	praha9net.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

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

IP Address	ASN	Details
81.0.204.159	AS21430 WIA spol. s.r.o.	`0.36ms` from Prague, CZ
81.0.205.122	AS21430 WIA spol. s.r.o.	`0.47ms` 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
218.246.85.39	AS18239 CAPNET	`3.34ms` from Beijing, CN
124.58.42.119	AS17858 LG POWERCOMM	`2.46ms` from Incheon, KR
18.245.158.87	AS16509 Amazon.com, Inc.	`0.33ms` from London, GB
79.144.193.87	AS3352 TELEFONICA DE ESPANA S.A.U.	`8.50ms` from Madrid, ES
36.26.129.7	AS4134 CHINANET-BACKBONE	`8.91ms` from Ningbo, CN
20.104.182.87	AS8075 Microsoft Corporation	`0.16ms` from Quebec, CA
87.16.1.119	AS3269 Telecom Italia S.p.A.	`6.24ms` from Rende, IT
46.175.101.151	AS48470 Joint Stock Company MTU Kristall	`7.22ms` from Samara, RU
103.113.70.7	AS209847 WorkTitans B.V.	`0.09ms` from Secaucus, US
54.255.21.23	AS16509 Amazon.com, Inc.	`0.13ms` from Singapore, SG
46.176.40.231	AS3329 VODAFONE-PANAFON HELLENIC TELECOMMUNICATIONS COMPANY SA	`4.85ms` from Sofia, BG
92.224.128.39	AS6805 Telefonica Germany GmbH & Co.OHG	`2.84ms` from Berlin, DE
135.224.205.39	AS8075 Microsoft Corporation	`0.25ms` from Boydton, US
117.243.106.87	AS9829 National Internet Backbone	`10.62ms` from Chennai, IN
76.245.203.39	AS7018 AT&T Enterprises, LLC	`18.17ms` from Chicago, US
87.35.176.135	AS1213 ASIERA TECHNOLOGY SERVICES CLG	`7.09ms` from Dublin, IE
84.135.51.183	AS3320 Deutsche Telekom AG	`2.59ms` from Duesseldorf, DE
212.132.63.71	AS56329 Gigaclear Limited	`1.82ms` from Erith, GB
89.246.166.167	AS8881 1&1 Versatel GmbH	`5.18ms` from Frankfurt am Main, DE
79.245.196.183	AS3320 Deutsche Telekom AG	`1.93ms` from Hamburg, DE
14.173.148.103	AS45899 VNPT Corp	`3.21ms` from Ho Chi Minh City, VN
62.30.169.7	AS5089 Virgin Media Limited	`7.71ms` from London, GB
2.20.6.55	AS6762 TELECOM ITALIA SPARKLE S.p.A.	`0.19ms` from Palermo, IT
34.196.102.231	AS14618 Amazon.com, Inc.	`0.19ms` from Reston, US
40.72.154.87	AS58593 Shanghai Blue Cloud Technology Co.,Ltd	`2.60ms` from Shanghai, CN

Traceroute

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

traceroute -a -n -q1 -f3 81.0.204.251

traceroute to 81.0.204.251 (81.0.204.251): 64 hops max, 52 byte packets

3 [AS60068] 185.229.188.12 7.769 ms

4 *

5 *

6 [AS21430] 81.0.245.243 23.745 ms

7 [AS21430] 81.0.204.251 23.392 ms

Measurement taken from

IPinfo ProbeNet in Zuerich, CH

On February 7th 2026

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.

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