astro.cz Website Information

Daily Unique Visits: 7,792

Daily Page Views: 38,960

Income Per Day: $97

Estimated Value: $58,200

This website is located in Czech Republic and is using following IP address 147.231.104.19. See the complete list of popular websites hosted in Czech Republic.

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

Website astro.cz is using the following name servers:

ns.astro.cz
visla.utia.cas.cz

and is probably hosted by CESNET z.s.p.o.. See the full list of other websites hosted by CESNET z.s.p.o..

The highest website astro.cz position in Alexa rank database was 15767 and the lowest rank position was 902223. Current position of astro.cz in Alexa rank database is 174863.

Desktop speed score of astro.cz (70/100) is better than the results of 50.91% of other sites and shows that the page desktop performance can be improved.

Mobile usability score of astro.cz (98/100) is better than the results of 55.61% of other sites and means that the page is mobile-friendly.

Mobile speed score of astro.cz (59/100) is better than the results of 52.41% of other sites and shows that the landing page performance on mobile devices is poor and can be improved.

astro.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.

astro.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: 3.12.2
% Timestamp: Sat May 22 09:12:43 2021

domain: astro.cz
registrant: SB:CAS
admin-c: PAVEL_SUCHAN
nsset: NSS:CAS:1
registrar: REG-ACTIVE24
registered: 17.04.1997 02:00:00
changed: 18.07.2013 17:05:00
expire: 11.10.2021

contact: SB:CAS
org: Ceska astronomicka spolecnost
name: Ceska astronomicka spolecnost
address: Fričova 298
address: Ondřejov
address: 251 65
address: CZ
registrar: REG-ACTIVE24
created: 10.08.2001 22:13:00
changed: 15.05.2018 21:32:00

contact: PAVEL_SUCHAN
name: Pavel Suchan
address: Fricova 298
address: Ondrejov
address: 251 65
address: CZ
registrar: REG-ACTIVE24
created: 10.08.2001 22:13:00
changed: 15.05.2018 21:32:00

nsset: NSS:CAS:1
nserver: ns.astro.cz (147.231.104.18)
nserver: visla.utia.cas.cz
tech-c: SB:CAS
tech-c: PAVEL_SUCHAN
tech-c: PETR_PRAVEC
tech-c: JC4-RIPE
tech-c: MK338-RIPE
registrar: REG-ACTIVE24
created: 01.10.2007 02:00:00
changed: 22.05.2012 14:49:51

contact: PETR_PRAVEC
name: Petr Pravec
address: Friova 1
address: Ondejov
address: 26165
address: CZ
registrar: REG-ACTIVE24
created: 06.09.2001 12:31:00
changed: 15.05.2018 21:32:00

contact: JC4-RIPE
name: Josef Chlachula
address: CZ
registrar: REG-ACTIVE24
created: 10.08.2001 22:13:00
changed: 15.05.2018 21:32:00

contact: MK338-RIPE
name: Martin Kolarik
address: CZ
registrar: REG-DIAL-TEL
created: 10.08.2001 22:13:00
changed: 15.05.2018 21:32:00

astro.cz server information

Servers Location

astro.cz desktop page speed rank

Last tested: 2017-04-29

Desktop Speed Medium

70/100

astro.cz Desktop Speed Test Quick Summary

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priority - 10Eliminate render-blocking JavaScript and CSS in above-the-fold content

Your page has 12 blocking script resources and 6 blocking CSS resources. This causes a delay in rendering your page.

Remove render-blocking JavaScript:

http://ajax.googleapis.com/ajax/libs/jquery/1.8.1/jquery.min.js
http://cdn.jquerytools.org/1.2.7/full/jquery.tools.min.js
http://www.astro.cz/_ui/js/jquery.plugin.js
http://www.astro.cz/_ui/js/jquery.countdown.min.js
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http://www.astro.cz/script/kalendar.js

Optimize CSS Delivery of the following:

http://fonts.googleapis.com/css?family=Open+Sans:3…subset=latin,latin-ext
http://www.astro.cz/_ui/css/main.css?1
http://www.astro.cz/style/autoSuggest.css
http://www.astro.cz/_ui/css/jqueryUI/jquery-ui-1.8.23.custom.css
http://www.astro.cz/_ui/css/jquery-ui-timepicker-addon.css
http://www.astro.cz/_ui/css/responsive-tables.css

priority - 2Leverage 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://cdn.jquerytools.org/1.2.7/full/jquery.tools.min.js (expiration not specified)
http://static.hotjar.com/c/hotjar-25765.js?sv=3 (60 seconds)
http://connect.facebook.net/cs_CZ/all.js (20 minutes)
http://www.google-analytics.com/analytics.js (2 hours)

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 5.7KiB (42% reduction).

Minifying http://www.astro.cz/_ui/js/jquery.plugin.js could save 2.3KiB (63% reduction) after compression.
Minifying http://www.astro.cz/_ui/js/main.js?3 could save 2.2KiB (36% reduction) after compression.
Minifying http://www.astro.cz/script/jquery.autoSuggest.js could save 1.2KiB (30% 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 3.7KiB (19% reduction).

Minifying http://www.astro.cz/_ui/css/main.css?1 could save 2.1KiB (16% reduction) after compression.
Minifying http://www.astro.cz/_ui/css/jqueryUI/jquery-ui-1.8.23.custom.css could save 1.6KiB (27% reduction) after compression.

astro.cz Desktop Resource Breakdown

Total Resources	88
Number of Hosts	13
Static Resources	77
JavaScript Resources	16
CSS Resources	7

astro.cz mobile page speed rank

Last tested: 2017-04-29

Mobile Speed Bad

59/100

astro.cz Mobile Speed Test Quick Summary

priority - 40Eliminate render-blocking JavaScript and CSS in above-the-fold content

Your page has 12 blocking script resources and 6 blocking CSS resources. This causes a delay in rendering your page.

Remove render-blocking JavaScript:

Optimize CSS Delivery of the following:

priority - 30Optimize images

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

Optimize the following images to reduce their size by 295KiB (51% reduction).

priority - 3Leverage 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:

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 5.7KiB (42% reduction).

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 3.7KiB (19% reduction).

astro.cz Mobile Resource Breakdown

Total Resources	87
Number of Hosts	13
Static Resources	76
JavaScript Resources	16
CSS Resources	7

astro.cz mobile page usability

Last tested: 2017-04-29

Mobile Usability Good

98/100

astro.cz Mobile Usability Test Quick Summary

priority - 2Size 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="/autori/viktor…mancikova.html">Viktória Zemančíková</a> and 9 others are close to other tap targets.

The tap target <a href="/clanky/ostatni.html" class="category">Ostatní</a> and 9 others are close to other tap targets.

The tap target <a href="/clanky/ostatn…nej-drahe.html">Vedci zaostril…Mliečnej dráhe</a> and 9 others are close to other tap targets.

The tap target <a href="/fotogalerie/c…ie-mesice.html">Česká astrofotografie měsíce</a> is close to 1 other tap targets.
The tap target <a href="http://www.cas100geo.cz">www.cas100geo.cz</a> and 3 others are close to other tap targets.
The tap target <a href="http://www.ast…polecnost.html">Česká astronomická společnost</a> and 1 others are close to other tap targets.

astro.cz HTML validation

Errors

Bad value “” for attribute “src” on element “img”: Must be non-empty.

Line: 151 Column: 127 - 147
"... záložce"><img src="" alt="" /></a> ..."

Bad value “10.12.2017 14:00” for attribute “datetime” on element “time”: The literal did not satisfy the time-datetime format.

Line: 220 Column: 17 - 50
"... <time datetime="10.12.2017 14:00">10.12...."

No “p” element in scope but a “p” end tag seen.

Line: 223 Column: 1045 - 1048
"...dáním.</p></p> ..." Line: 260 Column: 633 - 636
"...botky.</p></p><div c..." Line: 264 Column: 594 - 597
"...olina.</p></p><div c..." Line: 268 Column: 435 - 438
"... okem.</p></p><div c..." Line: 272 Column: 823 - 826
"...rius).</p></p><div c..." Line: 276 Column: 757 - 760
"...ech...</p></p><div c..." Line: 280 Column: 550 - 553
"...jektů.</p></p><div c..." Line: 284 Column: 579 - 582
"...burgh.</p></p><div c..." Line: 288 Column: 695 - 698
"...ancii.</p></p><div c..." Line: 292 Column: 804 - 807
"...ature.</p></p><div c..."

Bad value “09.12.2017 12:00” for attribute “datetime” on element “time”: The literal did not satisfy the time-datetime format.

Line: 257 Column: 21 - 54
"... <time datetime="09.12.2017 12:00">09.12...."

Bad value “07.12.2017 20:30” for attribute “datetime” on element “time”: The literal did not satisfy the time-datetime format.

Line: 261 Column: 21 - 54
"... <time datetime="07.12.2017 20:30">07.12...."

Bad value “07.12.2017 14:01” for attribute “datetime” on element “time”: The literal did not satisfy the time-datetime format.

Line: 265 Column: 21 - 54
"... <time datetime="07.12.2017 14:01">07.12...."

Bad value “07.12.2017 06:45” for attribute “datetime” on element “time”: The literal did not satisfy the time-datetime format.

Line: 269 Column: 21 - 54
"... <time datetime="07.12.2017 06:45">07.12...."

Bad value “06.12.2017 15:46” for attribute “datetime” on element “time”: The literal did not satisfy the time-datetime format.

Line: 273 Column: 21 - 54
"... <time datetime="06.12.2017 15:46">06.12...."

Bad value “06.12.2017 10:00” for attribute “datetime” on element “time”: The literal did not satisfy the time-datetime format.

Line: 277 Column: 21 - 54
"... <time datetime="06.12.2017 10:00">06.12...."

Bad value “06.12.2017 07:13” for attribute “datetime” on element “time”: The literal did not satisfy the time-datetime format.

Line: 281 Column: 21 - 54
"... <time datetime="06.12.2017 07:13">06.12...."

Bad value “05.12.2017 14:34” for attribute “datetime” on element “time”: The literal did not satisfy the time-datetime format.

Line: 285 Column: 21 - 54
"... <time datetime="05.12.2017 14:34">05.12...."

Bad value “05.12.2017 06:18” for attribute “datetime” on element “time”: The literal did not satisfy the time-datetime format.

Line: 289 Column: 21 - 54
"... <time datetime="05.12.2017 06:18">05.12...."

An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.

Line: 301 Column: 83 - 150
"...z/100let"><img src="http://www.astro.cz/images/obrazky/original/091377.jpg" /> </a><..." Line: 305 Column: 145 - 212
"...="_blank"><img src="http://www.astro.cz/images/obrazky/original/087598.jpg" /> </a><..." Line: 307 Column: 110 - 177
"...="_blank"><img src="http://www.astro.cz/images/obrazky/original/087599.jpg" /> </a><..." Line: 316 Column: 977 - 1044
"...ie.html"><img src="http://www.astro.cz/images/obrazky/original/091376.jpg" /> </a></..." Line: 354 Column: 66 - 129
"...9374.jpg"><img src="http://www.astro.cz/images/obrazky/male/099374.jpg" /></a></..."

The text content of element “time” was not in the required format: The literal did not satisfy the time-datetime format.

Line: 317 Column: 57 - 63
"...13.12.2017</time> ..." Line: 320 Column: 57 - 63
"...13.12.2017</time> ..." Line: 323 Column: 57 - 63
"...20.12.2017</time> ..." Line: 326 Column: 57 - 63
"...20.04.2018</time> ..."

Bad value “06.11.2017 00:00” for attribute “datetime” on element “time”: The literal did not satisfy the time-datetime format.

Line: 342 Column: 29 - 62
"... <time datetime="06.11.2017 00:00">06.11...."

Bad value “01.11.2017 06:06” for attribute “datetime” on element “time”: The literal did not satisfy the time-datetime format.

Line: 346 Column: 29 - 62
"... <time datetime="01.11.2017 06:06">01.11...."

Bad value “27.10.2017 00:00” for attribute “datetime” on element “time”: The literal did not satisfy the time-datetime format.

Line: 350 Column: 29 - 62
"... <time datetime="27.10.2017 00:00">27.10...."

Warnings

Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.

Line: 218 Column: 3 - 33
"...</div> <section id="content" class=""> <arti..."

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astro.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.

astro.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.

ASTRO.CZ Astronomický informační server astro.cz

astro.cz Website Information

Advertisement

astro.cz Alexa Rank

astro.cz whois

astro.cz server information

Servers Location

astro.cz desktop page speed rank

astro.cz Desktop Speed Test Quick Summary

priority - 30Optimize images

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

Optimize the following images to reduce their size by 295KiB (51% reduction).

priority - 10Eliminate render-blocking JavaScript and CSS in above-the-fold content

Your page has 12 blocking script resources and 6 blocking CSS resources. This causes a delay in rendering your page.

Remove render-blocking JavaScript:

Optimize CSS Delivery of the following:

priority - 2Leverage 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:

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 5.7KiB (42% reduction).

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 3.7KiB (19% reduction).

astro.cz Desktop Resource Breakdown

astro.cz mobile page speed rank

astro.cz Mobile Speed Test Quick Summary

priority - 40Eliminate render-blocking JavaScript and CSS in above-the-fold content

Your page has 12 blocking script resources and 6 blocking CSS resources. This causes a delay in rendering your page.

Remove render-blocking JavaScript:

Optimize CSS Delivery of the following:

priority - 30Optimize images

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

Optimize the following images to reduce their size by 295KiB (51% reduction).

priority - 3Leverage 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:

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 5.7KiB (42% reduction).

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 3.7KiB (19% reduction).

astro.cz Mobile Resource Breakdown

astro.cz mobile page usability

astro.cz Mobile Usability Test Quick Summary

priority - 2Size 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.

astro.cz HTML validation

Errors

Bad value “” for attribute “src” on element “img”: Must be non-empty.

Bad value “10.12.2017 14:00” for attribute “datetime” on element “time”: The literal did not satisfy the time-datetime format.

No “p” element in scope but a “p” end tag seen.

Bad value “09.12.2017 12:00” for attribute “datetime” on element “time”: The literal did not satisfy the time-datetime format.

Bad value “07.12.2017 20:30” for attribute “datetime” on element “time”: The literal did not satisfy the time-datetime format.

Bad value “07.12.2017 14:01” for attribute “datetime” on element “time”: The literal did not satisfy the time-datetime format.

Bad value “07.12.2017 06:45” for attribute “datetime” on element “time”: The literal did not satisfy the time-datetime format.

Bad value “06.12.2017 15:46” for attribute “datetime” on element “time”: The literal did not satisfy the time-datetime format.

Bad value “06.12.2017 10:00” for attribute “datetime” on element “time”: The literal did not satisfy the time-datetime format.

Bad value “06.12.2017 07:13” for attribute “datetime” on element “time”: The literal did not satisfy the time-datetime format.

Bad value “05.12.2017 14:34” for attribute “datetime” on element “time”: The literal did not satisfy the time-datetime format.

Bad value “05.12.2017 06:18” for attribute “datetime” on element “time”: The literal did not satisfy the time-datetime format.

An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.

The text content of element “time” was not in the required format: The literal did not satisfy the time-datetime format.

Bad value “06.11.2017 00:00” for attribute “datetime” on element “time”: The literal did not satisfy the time-datetime format.

Bad value “01.11.2017 06:06” for attribute “datetime” on element “time”: The literal did not satisfy the time-datetime format.

Bad value “27.10.2017 00:00” for attribute “datetime” on element “time”: The literal did not satisfy the time-datetime format.

Warnings

Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.

astro.cz similar domains

astro.cz Ping

astro.cz TRACEROUTE