os3.nl Website Information
Daily Unique Visits: 946
Daily Page Views: 1,892
Income Per Day: $6
Estimated Value: $1,440
os3.nl is registered under .NL top-level domain. Please check other sites in .NL zone.
No name server records were found.
and is probably hosted by SURFnet bv. See the full list of other websites hosted by SURFnet bv.
The highest website os3.nl position in Alexa rank database was 133601 and the lowest rank position was 989538. Current position of os3.nl in Alexa rank database is 757858.
Desktop speed score of os3.nl (16/100) is better than the results of 2.91% of other sites and shows that the page desktop performance can be improved.
Mobile usability score of os3.nl (62/100) is better than the results of 7.29% of other sites and means that the page is not mobile-friendly.
Mobile speed score of os3.nl (13/100) is better than the results of 2.22% of other sites and shows that the landing page performance on mobile devices is poor and can be improved.
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os3.nl 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.
os3.nl 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.
Domain name: os3.nl
Status: active
Registrar:
SURF B.V.
Moreelsepark 48
3511EP Utrecht
Netherlands
Abuse Contact:
+31.887873000
cert@surfcert.nl
Creation Date: 2003-01-29
Updated Date: 2012-05-31
DNSSEC: yes
Domain nameservers:
ns1.os3.nl 145.100.96.66
ns1.os3.nl 2001:610:158:960::66
ns2.os3.nl 145.100.96.99
ns2.os3.nl 2001:610:158:960::99
ns1.zurich.surf.net
Record maintained by: NL Domain Registry
Copyright notice
No part of this publication may be reproduced, published, stored in a
retrieval system, or transmitted, in any form or by any means,
electronic, mechanical, recording, or otherwise, without prior
permission of the Foundation for Internet Domain Registration in the
Netherlands (SIDN).
These restrictions apply equally to registrars, except in that
reproductions and publications are permitted insofar as they are
reasonable, necessary and solely in the context of the registration
activities referred to in the General Terms and Conditions for .nl
Registrars.
Any use of this material for advertising, targeting commercial offers or
similar activities is explicitly forbidden and liable to result in legal
action. Anyone who is aware or suspects that such activities are taking
place is asked to inform the Foundation for Internet Domain Registration
in the Netherlands.
(c) The Foundation for Internet Domain Registration in the Netherlands
(SIDN) Dutch Copyright Act, protection of authors' rights (Section 10,
subsection 1, clause 1).
Status: active
Registrar:
SURF B.V.
Moreelsepark 48
3511EP Utrecht
Netherlands
Abuse Contact:
+31.887873000
cert@surfcert.nl
Creation Date: 2003-01-29
Updated Date: 2012-05-31
DNSSEC: yes
Domain nameservers:
ns1.os3.nl 145.100.96.66
ns1.os3.nl 2001:610:158:960::66
ns2.os3.nl 145.100.96.99
ns2.os3.nl 2001:610:158:960::99
ns1.zurich.surf.net
Record maintained by: NL Domain Registry
Copyright notice
No part of this publication may be reproduced, published, stored in a
retrieval system, or transmitted, in any form or by any means,
electronic, mechanical, recording, or otherwise, without prior
permission of the Foundation for Internet Domain Registration in the
Netherlands (SIDN).
These restrictions apply equally to registrars, except in that
reproductions and publications are permitted insofar as they are
reasonable, necessary and solely in the context of the registration
activities referred to in the General Terms and Conditions for .nl
Registrars.
Any use of this material for advertising, targeting commercial offers or
similar activities is explicitly forbidden and liable to result in legal
action. Anyone who is aware or suspects that such activities are taking
place is asked to inform the Foundation for Internet Domain Registration
in the Netherlands.
(c) The Foundation for Internet Domain Registration in the Netherlands
(SIDN) Dutch Copyright Act, protection of authors' rights (Section 10,
subsection 1, clause 1).
os3.nl server information
Servers Location
os3.nl desktop page speed rank
Last tested: 2017-05-31
Desktop Speed
Bad
16/100
os3.nl Desktop Speed Test Quick Summary
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priority - 63Minify JavaScript
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priority - 18Eliminate render-blocking JavaScript and CSS in above-the-fold content
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priority - 5Leverage 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://www.os3.nl/lib/images/fileicons/pdf.png (expiration not specified)
https://www.os3.nl/lib/plugins/sidebox/bgsmallgradient.png (expiration not specified)
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https://www.os3.nl/lib/plugins/sidebox/bgsmallgradient.png (expiration not specified)
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https://www.os3.nl/_media/top_2017.png?w=165&tok=373897 (24 hours)
os3.nl Desktop Resource Breakdown
| Total Resources | 17 |
| Number of Hosts | 2 |
| Static Resources | 12 |
| JavaScript Resources | 3 |
| CSS Resources | 1 |
os3.nl mobile page speed rank
Last tested: 2017-05-31
Mobile Speed
Bad
13/100
os3.nl Mobile Speed Test Quick Summary
priority - 209Optimize images
Properly formatting and compressing images can save many bytes of data.
Optimize the following images to reduce their size by 2MiB (98% reduction).
Compressing and resizing https://www.os3.nl/_media/top_2017.png?w=165&tok=373897 could save 2MiB (98% reduction).
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priority - 111Enable compression
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Compressing https://www.os3.nl/lib/exe/js.php?tseed=15f387aea35e546d744198529f36ba76 could save 1.1MiB (74% reduction).
priority - 72Eliminate render-blocking JavaScript and CSS in above-the-fold content
Your page has 2 blocking script resources and 1 blocking CSS resources. This causes a delay in rendering your page.
Remove render-blocking JavaScript:
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https://www.os3.nl/non-wiki/mathjax-dokuwiki/MathJax.js?config=TeX-AMS_HTML
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priority - 63Minify JavaScript
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priority - 7Leverage 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://www.os3.nl/lib/images/fileicons/pdf.png (expiration not specified)
https://www.os3.nl/lib/plugins/sidebox/bgsmallgradient.png (expiration not specified)
https://www.os3.nl/lib/tpl/website//SNE-images/SNELogo.png (expiration not specified)
https://www.os3.nl/lib/tpl/website/SNE-images/bgbiggradient.png (expiration not specified)
https://www.os3.nl/lib/tpl/website/images/buttonshadow.png (expiration not specified)
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https://www.os3.nl/_media/top_2017.png?w=165&tok=373897 (24 hours)
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https://www.os3.nl/lib/tpl/website//SNE-images/SNELogo.png (expiration not specified)
https://www.os3.nl/lib/tpl/website/SNE-images/bgbiggradient.png (expiration not specified)
https://www.os3.nl/lib/tpl/website/images/buttonshadow.png (expiration not specified)
https://www.os3.nl/lib/tpl/website/images/closed.gif (expiration not specified)
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https://www.os3.nl/lib/tpl/website/images/link_icon.gif (expiration not specified)
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https://www.os3.nl/_media/top_2017.png?w=165&tok=373897 (24 hours)
os3.nl Mobile Resource Breakdown
| Total Resources | 18 |
| Number of Hosts | 2 |
| Static Resources | 12 |
| JavaScript Resources | 3 |
| CSS Resources | 1 |
os3.nl mobile page usability
Last tested: 2017-05-31
Mobile Usability
Bad
62/100
os3.nl 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.
Trace: and 1 others render only 4 pixels tall (10 CSS pixels).SNE/OS3 Homepage renders only 4 pixels tall (10 CSS pixels).Navigation renders only 5 pixels tall (13 CSS pixels).OS3 Masters Theses and 18 others render only 4 pixels tall (11 CSS pixels).Archive and 1 others render only 4 pixels tall (11 CSS pixels).Courses renders only 4 pixels tall (11 CSS pixels).Keuzegids (Dutch) renders only 5 pixels tall (13 CSS pixels).Master Education SNE/OS3 and 5 others render only 8 pixels tall (20 CSS pixels).In order to ma…e improved our and 31 others render only 5 pixels tall (13 CSS pixels).University of Amsterdam and 2 others render only 5 pixels tall (13 CSS pixels).Security and N…rk Engineering and 8 others render only 5 pixels tall (13 CSS pixels).the admission page and 3 others render only 5 pixels tall (13 CSS pixels).handout format and 1 others render only 5 pixels tall (13 CSS pixels).SNE again awar…er in category and 1 others render only 5 pixels tall (13 CSS pixels).paper renders only 5 pixels tall (13 CSS pixels).info and 2 others render only 5 pixels tall (13 CSS pixels).priority - 13Size 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="/start" class="breadcrumbs">SNE/OS3 Homepage</a> is close to 1 other tap targets.The tap target
<input id="qsearch__in" type="text" name="id" class="edit"> is close to 1 other tap targets.The tap target
<input type="submit" class="button"> is close to 2 other tap targets.The tap target
<a href="/start" class="wikilink1">Home</a> and 18 others are close to other tap targets.The tap target
<a href="#foldedlist_134" class="folder">Info</a> and 1 others are close to other tap targets.The tap target
<a href="#foldedlist_548" class="folder">Courses</a> is close to 4 other tap targets.The tap target
<a href="#sidebox_22" class="sidebox_title">Keuzegids (Dutch)</a> is close to 1 other tap targets.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.
os3.nl HTML validation
Errors
Almost standards mode doctype. Expected “<!DOCTYPE html>”.
Line: 2 Column: 1 - 59
"...<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html..."
"...<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html..."
No “li” element in scope but a “li” end tag seen.
Line: 108 Column: 16 - 20
"...</li></ul></li></ul> ..."
"...</li></ul></li></ul> ..."
Stray end tag “ul”.
Line: 108 Column: 21 - 25
"...</ul></li></ul> </div..."
"...</ul></li></ul> </div..."
Warnings
The “bdi” element is not supported in all browsers. Please be sure to test, and consider using a polyfill.
Line: 62 Column: 95 - 99
"...s="curid"><bdi><a hre..."
"...s="curid"><bdi><a hre..."
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os3.nl 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.
os3.nl 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.