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F4.CZ Website Information

f4.cz Website Information

Daily Unique Visits: 789

Daily Page Views: 1,578

Income Per Day: $5

Estimated Value: $1,200

f4.cz is registered under .CZ top-level domain. Please check other sites in .CZ zone.

No name server records were found.

and is probably hosted by VSHosting s.r.o.. See the full list of other websites hosted by VSHosting s.r.o..

The highest website f4.cz position in Alexa rank database was 396409 and the lowest rank position was 989500. Current position of f4.cz in Alexa rank database is 909089.

Desktop speed of f4.cz is unknown.

Mobile usability score of f4.cz (58/100) is better than the results of 1.7% of other sites and means that the page is not mobile-friendly.

Mobile speed score of f4.cz (41/100) is better than the results of 20.18% of other sites and shows that the landing page performance on mobile devices is poor and can be improved.

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f4.cz Alexa Rank

The traffic rank is based on three months of aggregated historical traffic data from millions of Alexa Toolbar users and is a combined measure of page views and users.

f4.cz whois

WHOIS gives you the ability to lookup any generic domains to find out the registered domain holder. WHOIS database are provided for information purposes only. It allows the public to check whether a specific domain name is still available or not and to obtain information related to the registration records of existing domain names.

% (c) 2006-2021 CZ.NIC, z.s.p.o.
%
% Intended use of supplied data and information
%
% Data contained in the domain name register, as well as information
% supplied through public information services of CZ.NIC association,
% are appointed only for purposes connected with Internet network
% administration and operation, or for the purpose of legal or other
% similar proceedings, in process as regards a matter connected
% particularly with holding and using a concrete domain name.
%
% Full text available at:
% http://www.nic.cz/page/306/intended-use-of-supplied-data-and-information/
%
% See also a search service at http://www.nic.cz/whois/
%
%
% Whoisd Server Version: 3.13.0
% Timestamp: Sat Feb 03 03:22:02 2024

domain: f4.cz
registrant: SB:AKACZUR-SUB
admin-c: NWS_BENES
nsset: FORPSI
keyset: ICZ-KS-IFCAU4DF
registrar: REG-INTERNET-CZ
registered: 14.03.2001 12:31:00
changed: 16.02.2021 21:31:04
expire: 16.03.2030

contact: SB:AKACZUR-SUB
org: Kaczur Ales
name: Ales Kaczur
address: Kosmonautu 4
address: Hlucin
address: 748 01
address: CZ
registrar: REG-INTERNET-CZ
created: 10.08.2001 22:13:00
changed: 15.05.2018 21:32:00

contact: NWS_BENES
org: Net-Wings Solutions
name: Petr Beneš
address: Horova 1671/18
address: Brno
address: 61600
address: CZ
registrar: REG-INTERNET-CZ
created: 09.04.2009 13:29:31
changed: 15.05.2018 21:32:00

nsset: FORPSI
nserver: ns.forpsi.net
nserver: ns.forpsi.cz (81.2.209.185, 2001:15e8:201:1::d1b9)
nserver: ns.forpsi.it
tech-c: FORPSI
registrar: REG-INTERNET-CZ
created: 01.10.2007 10:19:47
changed: 05.01.2016 11:50:14

contact: FORPSI
org: INTERNET CZ, a.s.
name: Stefano Cecconi
address: Ktiš 2
address: Ktiš
address: 38403
address: CZ
registrar: REG-INTERNET-CZ
created: 04.08.2008 14:42:08
changed: 15.05.2018 21:32:00

keyset: ICZ-KS-IFCAU4DF
dnskey: 257 3 10 AwEAAdZFcTEkXLESGjMMyzCcx2K6MLB+NdtFdCYf5u5KhBbM86KenEHcYs4qv1LG0Hteodmk0lawzDvJb54pW47Ho5MjkkzdkBUTdse7Ynhh0sdRmToAq/KW9+aLgKDVQdG17UeRnudDSQ90BtW/WfG+35rqE/FehbHi2yAKgmeQexc8v1Xm3jMbs3bGwthf9qBnPphF2fcDHADzud62f5FnAjiHlz16HH9QN4tTQI7tTajny1gDHL+TcFsvhnWGIIQuJ+KW6RDOm+hYnsGnnB8XVXIvqjtJLOjayef8NPwcEPjaSyEJQ3f2yI2iSlDhJgWPGUdj1QMxOco2v+72V5C/doU=
tech-c: INTERNET-CZ-KEYSET
registrar: REG-INTERNET-CZ
created: 16.02.2021 21:31:04

contact: INTERNET-CZ-KEYSET
org: INTERNET CZ, a.s.
name: Stefano Cecconi
address: Ktiš 2
address: Ktiš
address: 38403
address: CZ
registrar: REG-INTERNET-CZ
created: 11.11.2019 14:34:25

f4.cz server information

Servers Location

f4.cz mobile page speed rank

Last tested: 2018-06-06

Mobile Speed Bad
41/100

f4.cz Mobile Speed Test Quick Summary


priority - 56Reduce server response time

priority - 46Leverage browser caching

Setting an expiry date or a maximum age in the HTTP headers for static resources instructs the browser to load previously downloaded resources from local disk rather than over the network.

Leverage browser caching for the following cacheable resources:

http://f4.cz/css/jquery.lightbox-0.5.css (expiration not specified)
http://f4.cz/css/stylef4.css (expiration not specified)
http://f4.cz/images/doporuceni/mini_cz_14_ubytovanikrkonose.cz.jpg (expiration not specified)
http://f4.cz/images/doporuceni/mini_cz_21_Logo%201.jpg (expiration not specified)
http://f4.cz/images/doporuceni/mini_cz_24_garden1.png (expiration not specified)
http://f4.cz/images/doporuceni/mini_cz_9_logo.jpg (expiration not specified)
http://f4.cz/images/doporuceni/mini_cz_cz_13_ETC.jpg%C5%A1kola_logo.jpg (expiration not specified)
http://f4.cz/images/doporuceni/mini_cz_cz_23_garden.pnggarden1.png (expiration not specified)
http://f4.cz/images/doporuceni/mini_cz_cz_cz_cz_cz…dop3.jpgdomy.jpgaa.jpg (expiration not specified)
http://f4.cz/img/aktuality.png (expiration not specified)
http://f4.cz/img/body.png (expiration not specified)
http://f4.cz/img/doporucuje.png (expiration not specified)
http://f4.cz/img/eshop.png (expiration not specified)
http://f4.cz/img/footer_c.png (expiration not specified)
http://f4.cz/img/footer_logo.png (expiration not specified)
http://f4.cz/img/footer_r.png (expiration not specified)
http://f4.cz/img/kiteboard.png (expiration not specified)
http://f4.cz/img/kurzy_li.png (expiration not specified)
http://f4.cz/img/left_menu_1.png (expiration not specified)
http://f4.cz/img/left_menu_2.png (expiration not specified)
http://f4.cz/img/left_menu_blue.png (expiration not specified)
http://f4.cz/img/main_bottom.png (expiration not specified)
http://f4.cz/img/main_top.png (expiration not specified)
http://f4.cz/img/menu_top_li.gif (expiration not specified)
http://f4.cz/img/nafacebooku.png (expiration not specified)
http://f4.cz/img/netwings_logo.png (expiration not specified)
http://f4.cz/img/ob_5.jpg (expiration not specified)
http://f4.cz/img/phone.gif (expiration not specified)
http://f4.cz/img/prihlaska.png (expiration not specified)
http://f4.cz/img/prihlaska_li.png (expiration not specified)
http://f4.cz/img/right_bottom.png (expiration not specified)
http://f4.cz/img/shnowkit.png (expiration not specified)
http://f4.cz/img/top.jpg (expiration not specified)
http://f4.cz/img/top_menu_c.png (expiration not specified)
http://f4.cz/img/top_menu_l_1.png (expiration not specified)
http://f4.cz/img/top_menu_r.png (expiration not specified)
http://f4.cz/img/white_bottom.png (expiration not specified)
http://f4.cz/img/white_bottom_1.png (expiration not specified)
http://f4.cz/img/white_top.png (expiration not specified)
http://f4.cz/img/windsurf.png (expiration not specified)
http://f4.cz/jquery-validate/jquery.validate.js (expiration not specified)
http://f4.cz/jquery-validate/lib/jquery.metadata.js (expiration not specified)
http://f4.cz/js/jquery.js (expiration not specified)
http://f4.cz/js/jquery.lightbox-0.5.min.js (expiration not specified)
http://f4.cz/js/script.js (expiration not specified)
http://f4.cz/js/supersleight.js (expiration not specified)
http://f4.cz/webmin/thirdparty/datepicker/css/datepicker.css (expiration not specified)
http://f4.cz/webmin/thirdparty/datepicker/js/datepicker.js (expiration not specified)
http://f4.cz/webmin/thirdparty/datepicker/lang/en.js (expiration not specified)
http://f4.cz/webmin/thirdparty/fckeditor/editor/kc…windsurfingu/prkna.JPG (expiration not specified)
http://f4.cz/webmin/thirdparty/fckeditor/editor/kc…o%20windsurfing/24.JPG (expiration not specified)
http://f4.cz/webmin/thirdparty/fckeditor/editor/kc…/lukinbubla%281%29.jpg (expiration not specified)
http://f4.cz/webmin/thirdparty/fckeditor/editor/kc…%20windsurfing/rob.JPG (expiration not specified)
http://f4.cz/webmin/thirdparty/fckeditor/editor/kc…tranka/DSC_0842(1).jpg (expiration not specified)
http://f4.cz/webmin/thirdparty/fckeditor/editor/kc…20stranka/DSC_1855.JPG (expiration not specified)
http://f4.cz/webmin/thirdparty/fckeditor/editor/kc…%20stranka/hangar3.jpg (expiration not specified)
http://f4.cz/webmin/thirdparty/fckeditor/editor/kc…d%20stranka/palava.jpg (expiration not specified)
http://f4.cz/webmin/thirdparty/fckeditor/editor/kc…20stranka/panorama.jpg (expiration not specified)
http://f4.cz/webmin/thirdparty/fckeditor/editor/kc…0stranka/panorama2.jpg (expiration not specified)
http://f4.cz/webmin/thirdparty/fckeditor/editor/kc…od%20stranka/tomik.JPG (expiration not specified)
https://static.doubleclick.net/instream/ad_status.js (15 minutes)
http://www.google-analytics.com/ga.js (2 hours)

priority - 31Optimize images

Properly formatting and compressing images can save many bytes of data.

Optimize the following images to reduce their size by 306.3KiB (21% reduction).

Compressing http://f4.cz/webmin/thirdparty/fckeditor/editor/kc…/lukinbubla%281%29.jpg could save 55.9KiB (43% reduction).
Compressing http://f4.cz/webmin/thirdparty/fckeditor/editor/kc…o%20windsurfing/24.JPG could save 28.9KiB (19% reduction).
Compressing http://f4.cz/webmin/thirdparty/fckeditor/editor/kc…tranka/DSC_0842(1).jpg could save 27.8KiB (19% reduction).
Compressing http://f4.cz/webmin/thirdparty/fckeditor/editor/kc…0stranka/panorama2.jpg could save 25.8KiB (18% reduction).
Compressing http://f4.cz/webmin/thirdparty/fckeditor/editor/kc…20stranka/panorama.jpg could save 25.7KiB (18% reduction).
Compressing http://f4.cz/webmin/thirdparty/fckeditor/editor/kc…20stranka/DSC_1855.JPG could save 24.6KiB (17% reduction).
Compressing http://f4.cz/webmin/thirdparty/fckeditor/editor/kc…od%20stranka/tomik.JPG could save 24.4KiB (17% reduction).
Compressing http://f4.cz/webmin/thirdparty/fckeditor/editor/kc…windsurfingu/prkna.JPG could save 24.4KiB (17% reduction).
Compressing http://f4.cz/img/top.jpg could save 23.8KiB (19% reduction).
Compressing http://f4.cz/webmin/thirdparty/fckeditor/editor/kc…%20windsurfing/rob.JPG could save 23.1KiB (16% reduction).
Compressing http://f4.cz/images/doporuceni/mini_cz_cz_13_ETC.jpg%C5%A1kola_logo.jpg could save 4.1KiB (45% reduction).
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Compressing http://f4.cz/images/doporuceni/mini_cz_21_Logo%201.jpg could save 3.2KiB (41% reduction).
Compressing http://f4.cz/images/doporuceni/mini_cz_cz_cz_cz_cz…dop3.jpgdomy.jpgaa.jpg could save 2.7KiB (43% reduction).
Compressing http://f4.cz/images/doporuceni/mini_cz_24_garden1.png could save 2.4KiB (46% reduction).
Compressing http://f4.cz/images/doporuceni/mini_cz_cz_23_garden.pnggarden1.png could save 2.4KiB (46% reduction).
Compressing http://f4.cz/images/doporuceni/mini_cz_9_logo.jpg could save 1.6KiB (49% reduction).
Compressing http://f4.cz/img/netwings_logo.png could save 576B (39% reduction).
Compressing http://f4.cz/img/shnowkit.png could save 462B (11% reduction).
Compressing http://f4.cz/img/kiteboard.png could save 418B (11% reduction).
Compressing http://f4.cz/img/prihlaska.png could save 363B (11% reduction).
Compressing http://f4.cz/img/footer_r.png could save 108B (30% reduction).
Compressing http://f4.cz/img/top_menu_l_1.png could save 106B (29% reduction).

priority - 24Eliminate render-blocking JavaScript and CSS in above-the-fold content

Your page has 7 blocking script resources and 3 blocking CSS resources. This causes a delay in rendering your page.

Remove render-blocking JavaScript:

http://f4.cz/webmin/thirdparty/datepicker/js/datepicker.js
http://f4.cz/js/jquery.js
http://f4.cz/js/supersleight.js
http://f4.cz/js/jquery.lightbox-0.5.min.js
http://f4.cz/js/script.js
http://f4.cz/jquery-validate/lib/jquery.metadata.js
http://f4.cz/jquery-validate/jquery.validate.js

Optimize CSS Delivery of the following:

http://f4.cz/css/stylef4.css
http://f4.cz/css/jquery.lightbox-0.5.css
http://f4.cz/webmin/thirdparty/datepicker/css/datepicker.css

priority - 1Minify JavaScript

Compacting JavaScript code can save many bytes of data and speed up downloading, parsing, and execution time.

Minify JavaScript for the following resources to reduce their size by 8.1KiB (31% reduction).

Minifying http://f4.cz/webmin/thirdparty/datepicker/js/datepicker.js could save 3.3KiB (27% reduction) after compression.
Minifying http://f4.cz/jquery-validate/jquery.validate.js could save 3.2KiB (33% reduction) after compression.
Minifying http://f4.cz/jquery-validate/lib/jquery.metadata.js could save 1.1KiB (71% reduction) after compression.
Minifying http://f4.cz/js/jquery.lightbox-0.5.min.js could save 362B (14% reduction) after compression.
Minifying http://f4.cz/js/script.js could save 127B (32% reduction) after compression.
Minifying http://f4.cz/webmin/thirdparty/datepicker/lang/en.js could save 125B (34% reduction) after compression.

priority - 0Minify CSS

Compacting CSS code can save many bytes of data and speed up download and parse times.

Minify CSS for the following resources to reduce their size by 2KiB (32% reduction).

Minifying http://f4.cz/webmin/thirdparty/datepicker/css/datepicker.css could save 860B (44% reduction) after compression.
Minifying http://f4.cz/css/stylef4.css could save 812B (23% reduction) after compression.
Minifying http://f4.cz/css/jquery.lightbox-0.5.css could save 416B (46% reduction) after compression.

f4.cz Mobile Resource Breakdown

Total Resources81
Number of Hosts10
Static Resources69
JavaScript Resources16
CSS Resources4

f4.cz mobile page usability

Last tested: 2018-06-06

Mobile Usability Bad
58/100

f4.cz Mobile Usability Test Quick Summary


priority - 40Use legible font sizes

The following text on your page renders in a way that may be difficult for some of your visitors to read. Use legible font sizes to provide a better user experience.

The following text fragments have a small font size. Increase the font size to make them more legible.

Úvod renders only 5 pixels tall (12 CSS pixels).

Tip na dárkové poukázky and 4 others render only 5 pixels tall (12 CSS pixels).

Kurzy Kiteboardingu and 5 others render only 5 pixels tall (13 CSS pixels).

Pálava Kiteboarding and 6 others render only 5 pixels tall (13 CSS pixels).

Doplňkový program na Pálavě and 13 others render only 5 pixels tall (14 CSS pixels).

Číslo na vítr na Pálavě and 3 others render only 5 pixels tall (13 CSS pixels).

602 253 132 renders only 6 pixels tall (16 CSS pixels).

Helitack into…u v Chorvatsku and 68 others render only 5 pixels tall (12 CSS pixels).

Like renders only 4 pixels tall (11 CSS pixels).
2.7K renders only 4 pixels tall (11 CSS pixels).
Všechny: 520029 and 1 others render only 5 pixels tall (12 CSS pixels).
Ideální dovole…surfingu s F4! renders only 6 pixels tall (15 CSS pixels).

Ideální dovole…surfingu s F4! renders only 7 pixels tall (18 CSS pixels).

Your browser d…ats available. renders only 5 pixels tall (14 CSS pixels).

Click here to…t HTML5 video. renders only 5 pixels tall (14 CSS pixels).

THE BEST OF BOL 2015 renders only 6 pixels tall (15 CSS pixels).

THE BEST OF BO…a windsurfingu renders only 7 pixels tall (18 CSS pixels).

Your browser d…ats available. renders only 5 pixels tall (14 CSS pixels).

Click here to…t HTML5 video. renders only 5 pixels tall (14 CSS pixels).

báječné léto 2…ků na surfu :) and 2 others render only 4 pixels tall (10 CSS pixels).

Váš F4 TEAM renders only 4 pixels tall (10 CSS pixels).

Léto, slunce,…s námi u vody. and 21 others render only 5 pixels tall (12 CSS pixels).
4.      Učíme…mální pokroky. and 22 others render only 5 pixels tall (12 CSS pixels).
stabilního tea…ch instruktorů renders only 5 pixels tall (12 CSS pixels).
Desatero důvod…na kurz s F4: renders only 6 pixels tall (15 CSS pixels).
Na shledanou u…í celý F4 team renders only 5 pixels tall (12 CSS pixels).
landkiting kur…liště, zábava, and 4 others render only 0 pixels tall (1 CSS pixels).
půjčovna na Pálavě v provozu and 1 others render only 5 pixels tall (13 CSS pixels).
10.5.2018 and 1 others render only 5 pixels tall (12 CSS pixels).
Aloha, již od…í celý F4 TEAM and 1 others render only 4 pixels tall (10 CSS pixels).
více and 1 others render only 5 pixels tall (12 CSS pixels).
F4 doporučuje renders only 5 pixels tall (13 CSS pixels).
© 2010 F4.cz renders only 6 pixels tall (15 CSS pixels).
mapa stránek and 2 others render only 5 pixels tall (12 CSS pixels).

priority - 18Size tap targets appropriately

Some of the links/buttons on your webpage may be too small for a user to easily tap on a touchscreen. Consider making these tap targets larger to provide a better user experience.

The following tap targets are close to other nearby tap targets and may need additional spacing around them.

The tap target <a href="/" class="active">Úvod</a> is close to 1 other tap targets.

The tap target <a href="f4_chorvatsko_windsurfing.html">Chorvatsko</a> and 6 others are close to other tap targets.

The tap target <a href="/f4_kurzy_kiteboardingu.html">Kurzy Kiteboardingu</a> and 2 others are close to other tap targets.

The tap target <a href="f4_videa_kurzy.html">Videa z kurzů</a> and 13 others are close to other tap targets.

The tap target <a href="https://www.yo…1Z8Wfw&amp;index=1">F4 - Bol, 20.-26.8. 2017</a> and 76 others are close to other tap targets.

The tap target <button class="ytp-watch-late…ton ytp-button"></button> and 1 others are close to other tap targets.

The tap target <button class="ytp-watch-late…ton ytp-button"></button> and 1 others are close to other tap targets.

The tap target <a href="http://www.uby…nikrkonose.cz/"></a> and 1 others are close to other tap targets.
The tap target <a href="http://shop.f4.cz/">eshop</a> is close to 1 other tap targets.

priority - 10Size content to viewport

The page content is too wide for the viewport, forcing the user to scroll horizontally. Size the page content to the viewport to provide a better user experience.

The page content is 1,280 CSS pixels wide, but the viewport is only 980 CSS pixels wide. The following elements fall outside the viewport:

The element <span>E-Shop</span> falls outside the viewport.
The element <span>Kontakt</span> falls outside the viewport.
The element <div class="right"> falls outside the viewport.
The element <div class="rand_5"> falls outside the viewport.
The element <a href="/aktuality.html">Aktuality</a> falls outside the viewport.
The element <h4>půjčovna na Pálavě v provozu</h4> falls outside the viewport.
The element <i>10.5.2018</i> falls outside the viewport.
The element <p>Aloha, již od…í celý F4 TEAM</p> falls outside the viewport.
The element <a href="/clanek.html?aktualita=153">více</a> falls outside the viewport.
The element <div class="hr"> falls outside the viewport.
The element <h4>Závěrečná F4 párty</h4> falls outside the viewport.
The element <i>20.9.2017</i> falls outside the viewport.
The element <p>Závěrečná F4 p…dého počasí!!!</p> falls outside the viewport.
The element <a href="/clanek.html?aktualita=152">více</a> falls outside the viewport.
The element <div class="bottom"> falls outside the viewport.
The element <div class="space"> falls outside the viewport.
The element <h3>F4 doporučuje</h3> falls outside the viewport.
The element <img src="/images/doporu…pnggarden1.png"> falls outside the viewport.
The element <img src="/images/doporu…_21_Logo 1.jpg"> falls outside the viewport.
The element <img src="/images/doporu…rkonose.cz.jpg"> falls outside the viewport.
The element <br> falls outside the viewport.
The element <img src="/images/doporu…škola_logo.jpg"> falls outside the viewport.
The element <br> falls outside the viewport.
The element <img src="/images/doporu…domy.jpgaa.jpg"> falls outside the viewport.
The element <br> falls outside the viewport.
The element <div class="bottom"> falls outside the viewport.
The element <div id="foot_space"> falls outside the viewport.
The element <span>eshop</span> falls outside the viewport.
The element <span>kontakt</span> falls outside the viewport.
The element <span>mapa stránek</span> falls outside the viewport.
The element <div class="right"> falls outside the viewport.

priority - 10Configure the viewport

Your page does not have a viewport specified. This causes mobile devices to render your page as it would appear on a desktop browser, scaling it down to fit on a mobile screen. Configure a viewport to allow your page to render properly on all devices.

f4.cz HTML validation

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f4.cz Ping

Ping is a computer network administration software utility used to test the reachability of a host on an Internet Protocol (IP) network. It measures the round-trip time for messages sent from the originating host to a destination computer that are echoed back to the source.

f4.cz TRACEROUTE

Traceroute is a computer network diagnostic tool for displaying the route (path) and measuring transit delays of packets across an Internet Protocol (IP) network. The history of the route is recorded as the round-trip times of the packets received from each successive host (remote node) in the route (path); the sum of the mean times in each hop is a measure of the total time spent to establish the connection. Traceroute proceeds unless all (three) sent packets are lost more than twice, then the connection is lost and the route cannot be evaluated.