portal.cz Website Information
Daily Unique Visits: 4,775
Daily Page Views: 19,100
Income Per Day: $53
Estimated Value: $28,620
This website is located in Czech Republic and is using following IP address 90.182.165.21. See the complete list of popular websites hosted in Czech Republic.
portal.cz is registered under .CZ top-level domain. Please check other sites in .CZ zone.
Website portal.cz is using the following name servers:
- alfa.ns.active24.cz
- beta.ns.active24.cz
- gama.ns.active24.sk
and is probably hosted by O2 Czech Republic, a.s.. See the full list of other websites hosted by O2 Czech Republic, a.s..
The highest website portal.cz position in Alexa rank database was 35462 and the lowest rank position was 999105. Current position of portal.cz in Alexa rank database is 262819.
Desktop speed score of portal.cz (0/100) shows that the page desktop performance can be improved.
Mobile usability score of portal.cz (99/100) is better than the results of 79.46% of other sites and means that the page is mobile-friendly.
Mobile speed score of portal.cz (9/100) is better than the results of 1.32% of other sites and shows that the landing page performance on mobile devices is poor and can be improved.
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portal.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.
portal.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.
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portal.cz server information
Servers Location
portal.cz desktop page speed rank
Last tested: 2018-02-14
Desktop Speed
Bad
0/100
portal.cz Desktop Speed Test Quick Summary
priority - 1587Optimize images
Properly formatting and compressing images can save many bytes of data.
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priority - 8Eliminate render-blocking JavaScript and CSS in above-the-fold content
Your page has 1 blocking script resources and 3 blocking CSS resources. This causes a delay in rendering your page.
Remove render-blocking JavaScript:
https://cdnjs.cloudflare.com/ajax/libs/cookieconse…3/cookieconsent.min.js
Optimize CSS Delivery of the following:
https://fonts.googleapis.com/css?family=Lora:400,700&subset=latin-ext
https://cdnjs.cloudflare.com/ajax/libs/cookieconse…/cookieconsent.min.css
https://fonts.googleapis.com/css?family=Lora:400,700&subset=latin-ext
https://cdnjs.cloudflare.com/ajax/libs/cookieconse…/cookieconsent.min.css
https://fonts.googleapis.com/css?family=Lora:400,700&subset=latin-ext
priority - 8Leverage 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:
https://nakladatelstvi.portal.cz/storage/cache/lar…4c9265ad351_jung-2.jpg (expiration not specified)
https://nakladatelstvi.portal.cz/storage/cache/lar…4cd63e38ab4_edicak.PNG (expiration not specified)
https://nakladatelstvi.portal.cz/storage/cache/lar…e-screen-1920x1080.jpg (expiration not specified)
https://nakladatelstvi.portal.cz/storage/cache/lar…111adac20_bannnerk.PNG (expiration not specified)
https://nakladatelstvi.portal.cz/storage/cache/lar…ce-02-2018-desktop.png (expiration not specified)
https://nakladatelstvi.portal.cz/storage/cache/lar…te-o-knihu-desktop.png (expiration not specified)
https://nakladatelstvi.portal.cz/storage/cache/sma…te-o-knihu-desktop.png (expiration not specified)
https://nakladatelstvi.portal.cz/storage/cache/sma…-rozvoj-sebeduvery.jpg (expiration not specified)
https://nakladatelstvi.portal.cz/storage/cache/sma…etsinou-vesele-web.jpg (expiration not specified)
https://nakladatelstvi.portal.cz/storage/cache/sma…latno-z-turina-web.jpg (expiration not specified)
https://nakladatelstvi.portal.cz/storage/cache/sma…hlik-auto-dum-1920.jpg (expiration not specified)
https://nakladatelstvi.portal.cz/storage/main_imag…3cedf52bc7c_150949.png (expiration not specified)
https://nakladatelstvi.portal.cz/storage/main_imag…3cee395ac54_logork.jpg (expiration not specified)
https://nakladatelstvi.portal.cz/storage/main_imag…-cernobile-600x600.jpg (expiration not specified)
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https://www.googletagmanager.com/gtm.js?id=GTM-KK3GC67&l=dataLayer (15 minutes)
https://nakladatelstvi.portal.cz/storage/cache/lar…4cd63e38ab4_edicak.PNG (expiration not specified)
https://nakladatelstvi.portal.cz/storage/cache/lar…e-screen-1920x1080.jpg (expiration not specified)
https://nakladatelstvi.portal.cz/storage/cache/lar…111adac20_bannnerk.PNG (expiration not specified)
https://nakladatelstvi.portal.cz/storage/cache/lar…ce-02-2018-desktop.png (expiration not specified)
https://nakladatelstvi.portal.cz/storage/cache/lar…te-o-knihu-desktop.png (expiration not specified)
https://nakladatelstvi.portal.cz/storage/cache/sma…te-o-knihu-desktop.png (expiration not specified)
https://nakladatelstvi.portal.cz/storage/cache/sma…-rozvoj-sebeduvery.jpg (expiration not specified)
https://nakladatelstvi.portal.cz/storage/cache/sma…etsinou-vesele-web.jpg (expiration not specified)
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https://www.googletagmanager.com/gtm.js?id=GTM-KK3GC67&l=dataLayer (15 minutes)
priority - 4Prioritize visible content
Your page requires additional network round trips to render the above-the-fold content. For best performance, reduce the amount of HTML needed to render above-the-fold content.
The entire HTML response was not sufficient to render the above-the-fold content. This usually indicates that additional resources, loaded after HTML parsing, were required to render above-the-fold content. Prioritize visible content that is needed for rendering above-the-fold by including it directly in the HTML response.
Only about 2% of the final above-the-fold content could be rendered with the full HTML response.
priority - 3Avoid landing page redirects
Your page has 2 redirects. Redirects introduce additional delays before the page can be loaded.
Avoid landing page redirects for the following chain of redirected URLs.
http://portal.cz/
https://nakladatelstvi.portal.cz/
https://nakladatelstvi.portal.cz/nakladatelstvi
https://nakladatelstvi.portal.cz/
https://nakladatelstvi.portal.cz/nakladatelstvi
priority - 1Reduce server response time
portal.cz Desktop Resource Breakdown
| Total Resources | 104 |
| Number of Hosts | 8 |
| Static Resources | 78 |
| JavaScript Resources | 54 |
| CSS Resources | 2 |
portal.cz mobile page speed rank
Last tested: 2018-05-07
Mobile Speed
Bad
9/100
portal.cz Mobile Speed Test Quick Summary
priority - 452Optimize images
Properly formatting and compressing images can save many bytes of data.
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Compressing and resizing https://obchod.portal.cz/pictureprovider.aspx?z=50…3048/9788026213048.jpg could save 367.3KiB (98% reduction).
Compressing https://nakladatelstvi.portal.cz/storage/cache/sma…te-o-knihu-desktop.png could save 280.8KiB (61% reduction).
Compressing and resizing https://obchod.portal.cz/pictureprovider.aspx?z=50…3017/9788026213017.jpg could save 227.1KiB (98% reduction).
Compressing https://nakladatelstvi.portal.cz/storage/cache/lar…e-screen-1920x1080.jpg could save 196.4KiB (52% reduction).
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Compressing and resizing https://obchod.portal.cz/pictureprovider.aspx?z=50…3215/9788026213215.jpg could save 149.7KiB (97% reduction).
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priority - 32Eliminate render-blocking JavaScript and CSS in above-the-fold content
Your page has 1 blocking script resources and 3 blocking CSS resources. This causes a delay in rendering your page.
Remove render-blocking JavaScript:
https://cdnjs.cloudflare.com/ajax/libs/cookieconse…3/cookieconsent.min.js
Optimize CSS Delivery of the following:
https://fonts.googleapis.com/css?family=Lora:400,700&subset=latin-ext
https://cdnjs.cloudflare.com/ajax/libs/cookieconse…/cookieconsent.min.css
https://fonts.googleapis.com/css?family=Lora:400,700&subset=latin-ext
https://cdnjs.cloudflare.com/ajax/libs/cookieconse…/cookieconsent.min.css
https://fonts.googleapis.com/css?family=Lora:400,700&subset=latin-ext
priority - 16Prioritize visible content
Your page requires additional network round trips to render the above-the-fold content. For best performance, reduce the amount of HTML needed to render above-the-fold content.
The entire HTML response was not sufficient to render the above-the-fold content. This usually indicates that additional resources, loaded after HTML parsing, were required to render above-the-fold content. Prioritize visible content that is needed for rendering above-the-fold by including it directly in the HTML response.
Only about 11% of the final above-the-fold content could be rendered with the full HTML response.
Click to see the screenshot with only the HTML response:
priority - 13Leverage 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:
https://nakladatelstvi.portal.cz/storage/cache/lar…4c9265ad351_jung-2.jpg (expiration not specified)
https://nakladatelstvi.portal.cz/storage/cache/lar…4cd63e38ab4_edicak.PNG (expiration not specified)
https://nakladatelstvi.portal.cz/storage/cache/lar…e-screen-1920x1080.jpg (expiration not specified)
https://nakladatelstvi.portal.cz/storage/cache/lar…metoda-cteni-mobil.png (expiration not specified)
https://nakladatelstvi.portal.cz/storage/cache/lar…7c8a68a73_bannnerk.jpg (expiration not specified)
https://nakladatelstvi.portal.cz/storage/cache/lar…sice-05-2018-mobil.png (expiration not specified)
https://nakladatelstvi.portal.cz/storage/cache/lar…ym-jamu-kopa-mobil.png (expiration not specified)
https://nakladatelstvi.portal.cz/storage/cache/sma…te-o-knihu-desktop.png (expiration not specified)
https://nakladatelstvi.portal.cz/storage/cache/sma…inym-jamu-kopa-web.jpg (expiration not specified)
https://nakladatelstvi.portal.cz/storage/cache/sma…je-olivoveho-haje3.jpg (expiration not specified)
https://nakladatelstvi.portal.cz/storage/cache/sma…e-odkaz-predku-web.jpg (expiration not specified)
https://nakladatelstvi.portal.cz/storage/cache/sma…imenze-mysleni-web.jpg (expiration not specified)
https://nakladatelstvi.portal.cz/storage/main_imag…3cedf52bc7c_150949.png (expiration not specified)
https://nakladatelstvi.portal.cz/storage/main_imag…3cee395ac54_logork.jpg (expiration not specified)
https://nakladatelstvi.portal.cz/storage/main_imag…-cernobile-600x600.jpg (expiration not specified)
https://nakladatelstvi.portal.cz/storage/main_imag…t-knihy-2017-cz-en.png (expiration not specified)
https://www.googletagmanager.com/gtm.js?id=GTM-KK3GC67&l=dataLayer (15 minutes)
https://nakladatelstvi.portal.cz/storage/cache/lar…4cd63e38ab4_edicak.PNG (expiration not specified)
https://nakladatelstvi.portal.cz/storage/cache/lar…e-screen-1920x1080.jpg (expiration not specified)
https://nakladatelstvi.portal.cz/storage/cache/lar…metoda-cteni-mobil.png (expiration not specified)
https://nakladatelstvi.portal.cz/storage/cache/lar…7c8a68a73_bannnerk.jpg (expiration not specified)
https://nakladatelstvi.portal.cz/storage/cache/lar…sice-05-2018-mobil.png (expiration not specified)
https://nakladatelstvi.portal.cz/storage/cache/lar…ym-jamu-kopa-mobil.png (expiration not specified)
https://nakladatelstvi.portal.cz/storage/cache/sma…te-o-knihu-desktop.png (expiration not specified)
https://nakladatelstvi.portal.cz/storage/cache/sma…inym-jamu-kopa-web.jpg (expiration not specified)
https://nakladatelstvi.portal.cz/storage/cache/sma…je-olivoveho-haje3.jpg (expiration not specified)
https://nakladatelstvi.portal.cz/storage/cache/sma…e-odkaz-predku-web.jpg (expiration not specified)
https://nakladatelstvi.portal.cz/storage/cache/sma…imenze-mysleni-web.jpg (expiration not specified)
https://nakladatelstvi.portal.cz/storage/main_imag…3cedf52bc7c_150949.png (expiration not specified)
https://nakladatelstvi.portal.cz/storage/main_imag…3cee395ac54_logork.jpg (expiration not specified)
https://nakladatelstvi.portal.cz/storage/main_imag…-cernobile-600x600.jpg (expiration not specified)
https://nakladatelstvi.portal.cz/storage/main_imag…t-knihy-2017-cz-en.png (expiration not specified)
https://www.googletagmanager.com/gtm.js?id=GTM-KK3GC67&l=dataLayer (15 minutes)
priority - 10Avoid landing page redirects
Your page has 2 redirects. Redirects introduce additional delays before the page can be loaded.
Avoid landing page redirects for the following chain of redirected URLs.
http://portal.cz/
https://nakladatelstvi.portal.cz/
https://nakladatelstvi.portal.cz/nakladatelstvi
https://nakladatelstvi.portal.cz/
https://nakladatelstvi.portal.cz/nakladatelstvi
priority - 1Reduce server response time
portal.cz Mobile Resource Breakdown
| Total Resources | 106 |
| Number of Hosts | 9 |
| Static Resources | 79 |
| JavaScript Resources | 55 |
| CSS Resources | 2 |
portal.cz mobile page usability
Last tested: 2018-05-07
Mobile Usability
Good
99/100
portal.cz Mobile Usability Test Quick Summary
priority - 0Size 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="https://obchod.portal.cz" class="menu__link">E-shop</a> is close to 1 other tap targets.The tap target
<div class="arrow-prev"> and 1 others are close to other tap targets.The tap target
<img src="https://obchod…8026213031.jpg" class="book-news__image active"> is close to 1 other tap targets.The tap target
<img src="https://obchod…8026213017.jpg" class="book-news__image"> and 3 others are close to other tap targets.portal.cz HTML validation
Errors
Element “meta” is missing one or more of the following attributes: “http-equiv”, “itemprop”, “name”, “property”.
Line: 11 Column: 405 - 480
"...website"/><meta data-n-head="true" data-hid="og:url" content="https://www.portal.cz"/><meta ..." Line: 11 Column: 481 - 562
"...rtal.cz"/><meta data-n-head="true" data-hid="og:site_name" content="Nakladatelství Portál"/><m..."
"...website"/><meta data-n-head="true" data-hid="og:url" content="https://www.portal.cz"/><meta ..." Line: 11 Column: 481 - 562
"...rtal.cz"/><meta data-n-head="true" data-hid="og:site_name" content="Nakladatelství Portál"/><m..."
Bad value “true” for attribute “async” on element “script”.
Line: 11 Column: 974 - 1084
"...con.ico"/><script data-n-head="true" src="//www.googletagmanager.com/gtm.js?id=GTM-KK3GC67&l=dataLayer" async="true"></scri..."
"...con.ico"/><script data-n-head="true" src="//www.googletagmanager.com/gtm.js?id=GTM-KK3GC67&l=dataLayer" async="true"></scri..."
Bad value “” for attribute “action” on element “form”: Must be non-empty.
Line: 31 Column: 52 - 64
"...ontainer"><form action><div c..."
"...ontainer"><form action><div c..."
An element with “role=menuitem” must be contained in, or owned by, an element with “role=menubar” or “role=menu”.
Line: 39 Column: 94 - 132
"...utToLeft"><li role="menuitem" class="menu__item"><a hre..." Line: 41 Column: 12 - 50
"... </a></li><li role="menuitem" class="menu__item"><a hre..." Line: 43 Column: 12 - 50
"... </a></li><li role="menuitem" class="menu__item"><a hre..." Line: 45 Column: 12 - 50
"... </a></li><li role="menuitem" class="menu__item"><a hre..." Line: 47 Column: 12 - 50
"... </a></li><li role="menuitem" class="menu__item"><a hre..." Line: 49 Column: 12 - 50
"... </a></li><li role="menuitem" class="menu__item"><a hre..." Line: 51 Column: 89 - 127
"...utToLeft"><li role="menuitem" class="menu__item"><a hre..." Line: 53 Column: 12 - 50
"... </a></li><li role="menuitem" class="menu__item"><a hre..." Line: 55 Column: 12 - 50
"... </a></li><li role="menuitem" class="menu__item"><a hre..." Line: 57 Column: 12 - 50
"... </a></li><li role="menuitem" class="menu__item"><a hre..." Line: 59 Column: 12 - 50
"... </a></li><li role="menuitem" class="menu__item"><a hre..." Line: 61 Column: 12 - 50
"... </a></li><li role="menuitem" class="menu__item"><a hre..." Line: 63 Column: 12 - 50
"... </a></li><li role="menuitem" class="menu__item"><a hre..." Line: 65 Column: 88 - 126
"...utToLeft"><li role="menuitem" class="menu__item"><a hre..." Line: 67 Column: 12 - 50
"... </a></li><li role="menuitem" class="menu__item"><a hre..." Line: 69 Column: 12 - 50
"... </a></li><li role="menuitem" class="menu__item"><a hre..." Line: 71 Column: 99 - 137
"...utToLeft"><li role="menuitem" class="menu__item"><a hre..." Line: 73 Column: 12 - 50
"... </a></li><li role="menuitem" class="menu__item"><a hre..." Line: 75 Column: 96 - 134
"...utToLeft"><li role="menuitem" class="menu__item"><a hre..." Line: 77 Column: 12 - 50
"... </a></li><li role="menuitem" class="menu__item"><a hre..." Line: 79 Column: 97 - 135
"...utToLeft"><li role="menuitem" class="menu__item"><a hre..." Line: 81 Column: 12 - 50
"... </a></li><li role="menuitem" class="menu__item"><a hre..." Line: 83 Column: 12 - 50
"... </a></li><li role="menuitem" class="menu__item"><a hre..." Line: 85 Column: 88 - 126
"...utToLeft"><li role="menuitem" class="menu__item"><a hre..." Line: 87 Column: 12 - 50
"... </a></li><li role="menuitem" class="menu__item"><a hre..."
"...utToLeft"><li role="menuitem" class="menu__item"><a hre..." Line: 41 Column: 12 - 50
"... </a></li><li role="menuitem" class="menu__item"><a hre..." Line: 43 Column: 12 - 50
"... </a></li><li role="menuitem" class="menu__item"><a hre..." Line: 45 Column: 12 - 50
"... </a></li><li role="menuitem" class="menu__item"><a hre..." Line: 47 Column: 12 - 50
"... </a></li><li role="menuitem" class="menu__item"><a hre..." Line: 49 Column: 12 - 50
"... </a></li><li role="menuitem" class="menu__item"><a hre..." Line: 51 Column: 89 - 127
"...utToLeft"><li role="menuitem" class="menu__item"><a hre..." Line: 53 Column: 12 - 50
"... </a></li><li role="menuitem" class="menu__item"><a hre..." Line: 55 Column: 12 - 50
"... </a></li><li role="menuitem" class="menu__item"><a hre..." Line: 57 Column: 12 - 50
"... </a></li><li role="menuitem" class="menu__item"><a hre..." Line: 59 Column: 12 - 50
"... </a></li><li role="menuitem" class="menu__item"><a hre..." Line: 61 Column: 12 - 50
"... </a></li><li role="menuitem" class="menu__item"><a hre..." Line: 63 Column: 12 - 50
"... </a></li><li role="menuitem" class="menu__item"><a hre..." Line: 65 Column: 88 - 126
"...utToLeft"><li role="menuitem" class="menu__item"><a hre..." Line: 67 Column: 12 - 50
"... </a></li><li role="menuitem" class="menu__item"><a hre..." Line: 69 Column: 12 - 50
"... </a></li><li role="menuitem" class="menu__item"><a hre..." Line: 71 Column: 99 - 137
"...utToLeft"><li role="menuitem" class="menu__item"><a hre..." Line: 73 Column: 12 - 50
"... </a></li><li role="menuitem" class="menu__item"><a hre..." Line: 75 Column: 96 - 134
"...utToLeft"><li role="menuitem" class="menu__item"><a hre..." Line: 77 Column: 12 - 50
"... </a></li><li role="menuitem" class="menu__item"><a hre..." Line: 79 Column: 97 - 135
"...utToLeft"><li role="menuitem" class="menu__item"><a hre..." Line: 81 Column: 12 - 50
"... </a></li><li role="menuitem" class="menu__item"><a hre..." Line: 83 Column: 12 - 50
"... </a></li><li role="menuitem" class="menu__item"><a hre..." Line: 85 Column: 88 - 126
"...utToLeft"><li role="menuitem" class="menu__item"><a hre..." Line: 87 Column: 12 - 50
"... </a></li><li role="menuitem" class="menu__item"><a hre..."
Element “img” is missing required attribute “src”.
Line: 109 Column: 298 - 329
"...ontainer"><img alt class="section__title"><div c..."
"...ontainer"><img alt class="section__title"><div c..."
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Line: 111 Column: 583 - 660
"...s knihou"><img src="/storage/main_image/5a3cee395ac54_logork.jpg" class="partners-logo"></a></..." Line: 111 Column: 755 - 854
"...e="JABOK"><img src="/storage/main_image/5a3cee802e414_logo-jabok-cernobile-600x600.jpg" class="partners-logo"></a></..." Line: 111 Column: 958 - 1055
"...ět knihy"><img src="/storage/main_image/5a3cef19338ac_logo-svet-knihy-2017-cz-en.png" class="partners-logo"></a></..." Line: 111 Column: 1166 - 1243
"...nablízko"><img src="/storage/main_image/5a3cedf52bc7c_150949.png" class="partners-logo"></a></..." Line: 114 Column: 13 - 84
"... <img src="/_nuxt/img/designeo-heart.0834283.svg" class="designeo-heart">by Des..."
"...s knihou"><img src="/storage/main_image/5a3cee395ac54_logork.jpg" class="partners-logo"></a></..." Line: 111 Column: 755 - 854
"...e="JABOK"><img src="/storage/main_image/5a3cee802e414_logo-jabok-cernobile-600x600.jpg" class="partners-logo"></a></..." Line: 111 Column: 958 - 1055
"...ět knihy"><img src="/storage/main_image/5a3cef19338ac_logo-svet-knihy-2017-cz-en.png" class="partners-logo"></a></..." Line: 111 Column: 1166 - 1243
"...nablízko"><img src="/storage/main_image/5a3cedf52bc7c_150949.png" class="partners-logo"></a></..." Line: 114 Column: 13 - 84
"... <img src="/_nuxt/img/designeo-heart.0834283.svg" class="designeo-heart">by Des..."
Warnings
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
Line: 89 Column: 67 - 104
"...ite-main"><section class="hero-slider__wrapper"><div c..." Line: 109 Column: 59 - 274
"...ion></div><section class="section section--padding section--bg section--h80 section--ai-center" style="background-image:url(https://nakladatelstvi.portal.cz/storage/cache/large/storage/main_image/5acc7c8a68a73_bannnerk.jpg);"><div c..."
"...ite-main"><section class="hero-slider__wrapper"><div c..." Line: 109 Column: 59 - 274
"...ion></div><section class="section section--padding section--bg section--h80 section--ai-center" style="background-image:url(https://nakladatelstvi.portal.cz/storage/cache/large/storage/main_image/5acc7c8a68a73_bannnerk.jpg);"><div c..."
Empty heading.
Line: 107 Column: 644 - 647
"... </p><h2><a sty..."
"... </p><h2><a sty..."
This document appears to be written in Czech. Consider adding “lang="cs"” (or variant) to the “html” start tag.
Line: 2 Column: 16 - 37
"...TYPE html> <html data-n-head-ssr data-n-head=""> <head..."
"...TYPE html> <html data-n-head-ssr data-n-head=""> <head..."
portal.cz similar domains
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portal.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.
portal.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.