1. All IP Ranges
  2. 81.0.0.0/8
  3. 81.91.0.0/16
  4. AS39790  | 81.91.88.0/21

81.91.88.0/21

AS39790  ·  Web4U s.r.o.

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Summary

Country Czechia
Domain web4u.cz
ASN AS39790
Parent Range 81.91.80.0/20
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

Overlapping Ranges

BGP prefixes that contain 81.91.88.0/21

Range ASN Company Num of IPs
81.91.80.0/20 AS39790 Web4U s.r.o. 4,096

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
81.91.80.0/20 AS39790 Web4U s.r.o. 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 2,865 domain names hosted across 210 IP addresses on this ASN. Checkout our API to access full domain hosting information.

IP Address Domain Domains on this IP
81.91.92.221 minijeraby.cz 330
81.91.92.70 velolipno.eu 176
81.91.91.14 anavy.cz 97
81.91.91.54 altx.cz 95
81.91.91.22 mikov.com 92
81.91.91.138 keyokna.cz 79
81.91.91.39 drbna.cz 76
81.91.91.91 veleslavinovarezidence.cz 68
81.91.92.215 tersl.info 59
81.91.92.157 jalousierechner.at 58
81.91.92.203 zonazabavy.cz 52
81.91.92.148 aeronauticamilitare.cz 51
81.91.92.32 hyha.cz 46
81.91.92.52 lahome.cz 42
81.91.92.98 ifp.cz 41
81.91.91.121 uzitkove-vozy.cz 40
81.91.93.19 cleantaxx.cz 39
81.91.92.83 good-art.eu 39
81.91.92.82 linchpin.cz 37
81.91.93.62 plexizahubicku.cz 34

Hosted domains API

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Pingable IPs

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

IP Address ASN Details
81.91.91.49 AS39790 Web4U s.r.o. 0.40ms from Prague, CZ
81.91.89.43 AS39790 Web4U s.r.o. 0.72ms from Prague, CZ
81.91.92.221 AS39790 Web4U s.r.o. 0.40ms from Prague, CZ
81.91.93.60 AS39790 Web4U s.r.o. 0.52ms from Prague, CZ
81.91.95.0 AS39790 Web4U s.r.o. 0.53ms 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
86.87.228.245 AS1136 KPN B.V. 2.18ms from Amsterdam, NL
185.232.84.5 AS152900 Onidel Pty Ltd 0.64ms from Amsterdam, NL
52.96.172.101 AS8075 Microsoft Corporation 0.31ms from Boydton, US
200.135.1.5 AS10715 Universidade Federal de Santa Catarina 10.74ms from Curitiba, BR
91.2.207.101 AS3320 Deutsche Telekom AG 2.44ms from Duesseldorf, DE
93.211.123.149 AS3320 Deutsche Telekom AG 6.26ms from Frankfurt am Main, DE
175.159.225.197 AS3661 The Chinese University of Hong Kong 1.31ms from Hong Kong, HK
202.131.70.53 AS9381 HKBN Enterprise Solutions HK Limited 0.72ms from Hong Kong, HK
180.66.181.229 AS9318 SK Broadband Co Ltd 1.90ms from Incheon, KR
90.221.187.53 AS5607 Sky UK Limited 2.86ms from London, GB
76.82.111.37 AS20001 Charter Communications Inc 5.98ms from Los Angeles, US
167.20.254.5 AS21928 T-Mobile USA, Inc. 14.21ms from New York City, US
84.139.137.101 AS3320 Deutsche Telekom AG 4.34ms from Nuernberg, DE
37.33.82.149 AS16086 DNA Oyj 10.85ms from Oulu, FI
217.73.120.101 AS211609 OKKO LLC 0.14ms from Samara, RU
69.55.228.69 AS22489 Castle Access Inc 2.18ms from San Diego, US
166.154.79.197 AS6167 Verizon Business 17.39ms from San Jose, US
135.134.18.229 AS4181 TDS TELECOM 12.92ms from Seattle, US
180.224.46.101 AS17858 LG POWERCOMM 1.85ms from Seoul, KR
220.93.150.53 AS4766 Korea Telecom 5.65ms from Seoul, KR
46.254.10.181 AS42695 Cleura AB 0.70ms from Stockholm, SE
178.134.17.197 AS35805 JSC "Silknet" 5.10ms from Tbilisi, GE
4.189.178.85 AS8075 Microsoft Corporation 0.47ms from Tokyo, JP
124.119.184.149 AS4134 CHINANET-BACKBONE 10.66ms from UEruemqi, CN
188.21.31.21 AS8447 A1 Telekom Austria AG 10.08ms from Vienna, AT

Traceroute

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

$
traceroute -a -n -q1 -f3 81.91.89.43
traceroute to 81.91.89.43 (81.91.89.43): 64 hops max, 52 byte packets
4 [] 91.210.16.49 0.727 ms
5 *
6 [] 185.138.110.51 0.715 ms
7 [AS39790] 81.91.95.10 0.528 ms
8 *
9 [AS39790] 81.91.89.43 1.258 ms
Measurement taken from IPinfo ProbeNet in Prague, CZ
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.

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