81.91.80.0/20

AS39790 · Web4U s.r.o.

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Summary

Country	Czechia
Domain	web4u.cz
ASN	AS39790
Registry	RIPE
ID	CZ-WEB4USRO-20060425

WHOIS Details

inetnum:        81.91.80.0 - 81.91.95.255
netname:        CZ-WEB4USRO-20060425
country:        CZ
org:            ORG-WS296-RIPE
admin-c:        WM3536-RIPE
tech-c:         WM3536-RIPE
status:         ALLOCATED PA
mnt-by:         MNT-WEB4U
mnt-by:         RIPE-NCC-HM-MNT
created:        2022-09-28T14:32:39Z
last-modified:  2022-09-28T14:32:39Z
source:         RIPE
abuse-email:    abuse@web4u.cz
abuse-c:        AR68991-RIPE
abuse-org:      ORG-WS296-RIPE

organisation:   ORG-WS296-RIPE
org-name:       Web4U s.r.o.
country:        CZ
org-type:       LIR
address:        Mahlerovy sady 1
address:        13000
address:        Praha 3
address:        CZECH REPUBLIC
phone:          +420270001456
e-mail:         ripe@web4u.cz
admin-c:        WM3536-RIPE
tech-c:         WM3536-RIPE
abuse-c:        AR68991-RIPE
mnt-ref:        MNT-WEB4U
mnt-by:         RIPE-NCC-HM-MNT
mnt-by:         MNT-WEB4U
created:        2022-09-20T07:29:12Z
last-modified:  2022-09-20T07:29:13Z
source:         RIPE
abuse-email:    abuse@web4u.cz
abuse-c:        AR68991-RIPE
abuse-org:      undefined

role:           WEB4U network operations
address:        CZECH REPUBLIC
address:        Praha 3
address:        13000
address:        Mahlerovy sady 1
phone:          +420270001456
e-mail:         praha@web4u.cz
admin-c:        FP15631-RIPE
tech-c:         FP15631-RIPE
abuse-mailbox:  abuse@web4u.cz
nic-hdl:        WM3536-RIPE
mnt-by:         MNT-WEB4U
created:        2022-09-20T07:29:12Z
last-modified:  2022-10-17T12:21:14Z
source:         RIPE

route:          81.91.80.0/21
origin:         AS39790
mnt-by:         MNT-WEB4U
created:        2024-05-16T12:05:41Z
last-modified:  2024-05-16T12:05:41Z
source:         RIPE

Nearby Ranges

BGP prefixes that overlap with 81.91.0.0/16

Range	ASN	Company	Num of IPs
81.91.32.0/19	AS8359	MTS PJSC	8,192
81.91.0.0/20	AS197308	Telia Cygate AB	4,096
81.91.112.0/20	AS12180	ALKIM BASIN YAYIN ILETISIM LTD. STI.	4,096
81.91.144.0/20	AS206065	Tose'h Fanavari Ertebabat Pasargad Arian Co. PJS	4,096
81.91.224.0/20	AS28683	SOCIETE BENINOISE D'INFRASTRUCTURES NUMERIQUES	4,096
81.91.192.0/20	AS29009	UK Broadband Ltd.	4,096
81.91.112.0/20	AS29060	ALKIM BASIN YAYIN ILETISIM LTD. STI.	4,096
81.91.208.0/20	AS39817	OvaNet, a.s.	4,096
81.91.160.0/20	AS8763	DENIC eG	4,096
81.91.96.0/21	AS60981	Associated Networks (UK) Limited	2,048
81.91.24.0/21	AS30873	Public Telecommunication Corporation	2,048
81.91.152.0/21	AS206065	Tose'h Fanavari Ertebabat Pasargad Arian Co. PJS	2,048
81.91.104.0/21	AS13101	Amtswerke Eggebek Verwaltungs GmbH trading as Amtswerke Eggebek GmbH & Co.KG.	2,048
81.91.16.0/21	AS199163	DATAGROUP Operations GmbH	2,048
81.91.248.0/22	AS29668	vXtream Ltd	1,024
81.91.242.0/24	AS29668	vXtream Ltd	256
81.91.244.0/24	AS29668	vXtream LTD	256
81.91.252.0/24	AS29668	vXtream - Switzerland /24 - # 2	256
81.91.253.0/24	AS29668	vXtream - Switzerland /24 - # 1	256
81.91.41.0/24	AS8359	MTS Ural branch, fixed Broadband access	256
81.91.189.0/24	AS44705	Obyedinennye Nakhabinskie seti LLC	256
81.91.180.0/24	AS48503	Tele2 Kazakhstan	256
81.91.181.0/24	AS48503	Tele2 Kazakhstan	256
81.91.182.0/24	AS48503	Tele2 Kazakhstan	256
81.91.183.0/24	AS48503	Tele2 Kazakhstan	256
81.91.184.0/24	AS48503	Tele2 Kazakhstan	256
81.91.185.0/24	AS48503	Tele2 Kazakhstan	256
81.91.190.0/24	AS202090	Aktivnie Tehnologii LLC	256
81.91.191.0/24	AS202090	Aktivnie Tehnologii LLC	256
81.91.186.0/24	AS48503	Tele2 Kazakhstan	256
81.91.187.0/24	AS48503	Tele2 Kazakhstan	256
81.91.225.0/24	AS28683	SOCIETE BENINOISE D'INFRASTRUCTURES NUMERIQUES	256
81.91.224.0/24	AS28683	SOCIETE BENINOISE D'INFRASTRUCTURES NUMERIQUES	256
81.91.228.0/24	AS28683	SOCIETE BENINOISE D'INFRASTRUCTURES NUMERIQUES	256
81.91.234.0/24	AS28683	SOCIETE BENINOISE D'INFRASTRUCTURES NUMERIQUES	256
81.91.235.0/24	AS28683	SOCIETE BENINOISE D'INFRASTRUCTURES NUMERIQUES	256
81.91.236.0/24	AS28683	SOCIETE BENINOISE D'INFRASTRUCTURES NUMERIQUES	256
81.91.188.0/24	AS48503	Tele2 Kazakhstan	256

Hosted domains

There are 47,431 domain names hosted across 483 IP addresses on this ASN. Checkout our API to access full domain hosting information.

IP Address	Domain	Domains on this IP

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

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

IP Address	ASN	Details
81.91.92.222	AS39790 Web4U s.r.o.	`0.36ms` from Prague, CZ
81.91.82.19	AS39790 Web4U s.r.o.	`0.40ms` from Prague, CZ
81.91.81.29	AS39790 Web4U s.r.o.	`0.43ms` from Prague, CZ
81.91.85.35	AS39790 Web4U s.r.o.	`0.40ms` from Prague, CZ
81.91.89.44	AS39790 Web4U s.r.o.	`0.70ms` from Prague, CZ
81.91.93.60	AS39790 Web4U s.r.o.	`0.52ms` from Prague, CZ
81.91.83.168	AS39790 Web4U s.r.o.	`0.41ms` from Prague, CZ
81.91.95.33	AS39790 Web4U s.r.o.	`0.55ms` from Prague, CZ
81.91.86.55	AS39790 Web4U s.r.o.	`0.41ms` from Prague, CZ
81.91.80.12	AS39790 Web4U s.r.o.	`0.49ms` from Prague, CZ
81.91.84.51	AS39790 Web4U s.r.o.	`0.42ms` from Prague, CZ
81.91.91.14	AS39790 Web4U s.r.o.	`0.45ms` from Prague, CZ
81.91.87.51	AS39790 Web4U s.r.o.	`0.43ms` 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
23.79.60.100	AS16625 Akamai Technologies, Inc.	`0.24ms` from Atlanta, US
35.208.18.116	AS15169 Google LLC	`0.40ms` from Council Bluffs, US
211.25.69.132	AS9930 TTNET-MY	`1.08ms` from Kuala Lumpur, MY
4.250.23.20	AS8075 Microsoft Corporation	`0.32ms` from London, GB
102.134.42.164	AS40065 CNSERVERS LLC	`0.24ms` from Los Angeles, US
193.233.102.84	AS9123 JSC TIMEWEB	`0.71ms` from Moscow, RU
201.20.29.212	AS15830 Equinix (EMEA) Acquisition Enterprises B.V.	`1.26ms` from Rio de Janeiro, BR
121.6.87.148	AS9506 Singtel Fibre Broadband	`1.50ms` from Singapore, SG
58.156.143.20	AS17506 ARTERIA Networks Corporation	`3.52ms` from Tokyo, JP
185.123.50.84	AS51944 DARIUSZ WESOLOWSKI trading as PROMEDIA NOWICKI WESOLOWSKI Sp.J.	`6.99ms` from Warsaw, PL
44.250.28.100	AS16509 Amazon.com, Inc.	`0.14ms` from Boardman, US
96.253.60.68	AS701 Verizon Business	`2.26ms` from Boston, US
98.60.193.36	AS7922 Comcast Cable Communications, LLC	`12.20ms` from Denver, US
67.20.96.4	AS46606 Unified Layer	`1.75ms` from Draper, US
13.135.107.212	AS16509 Amazon.com, Inc.	`0.19ms` from London, GB
89.169.160.4	AS200350 Yandex.Cloud LLC	`3.88ms` from Moscow, RU
50.49.143.100	AS5650 Frontier Communications of America, Inc.	`8.31ms` from New York City, US
13.52.27.180	AS16509 Amazon.com, Inc.	`0.14ms` from San Jose, US
186.220.151.20	AS28573 Claro NXT Telecomunicacoes Ltda	`6.37ms` from Sao Paulo, BR
118.35.52.212	AS4766 Korea Telecom	`7.05ms` from Seoul, KR
221.167.37.52	AS4766 Korea Telecom	`6.84ms` from Seoul, KR
139.141.176.116	AS25242 KUWAIT UNIVERSITY	`11.62ms` from Az Za`ayin, QA
54.201.220.52	AS16509 Amazon.com, Inc.	`0.14ms` from Boardman, US
136.22.139.20	AS36040 Google LLC	`0.20ms` from Chicago, US
117.235.248.52	AS9829 National Internet Backbone	`3.48ms` from Delhi, IN

Traceroute

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

traceroute -a -n -q1 -f4 81.91.85.16

traceroute to 81.91.85.16 (81.91.85.16): 64 hops max, 52 byte packets

4 [] 91.210.16.49 0.66 ms

5 *

6 [] 185.138.110.51 1.01 ms

7 *

8 *

9 [AS39790] 81.91.85.16 0.687 ms

Measurement taken from

IPinfo ProbeNet in Prague, CZ

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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