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 Generated on April 03 2016 00:39 AM

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SEO Content

Title ds9a.nl

Length : 7

Ideally, your title should contain between 10 and 70 characters (spaces included). Try to write a catchy title to get attention.

Length : 0

Description is missing. It will tell search engines and potential visitors what your page is about. Keep it between 70 and 160 characters (spaces included).

Note: Google sometimes chooses not display the description you put in here, but rather shows a part of your page text that it seems relevant to the users search query..
Og Meta Properties This page does not take advantage of Og Properties. When people share or like your page, it is great to have good Og properties. Otherwise, they will just see a link to your website.

In case of Facebook or Twitter this is how you get started:

Facebook: https://developers.facebook.com/docs/sharing/webmasters

Twitter: https://dev.twitter.com/cards/getting-started
H1 H2 H3 H4 H5 H6
1 10 0 0 0 0
  • [H1] ds9a.nl
  • [H2] Food, nutrition, science, health
  • [H2] Startup, innovation & business related
  • [H2] Publications
  • [H2] Presentations
  • [H2] Some random stuff
  • [H2] Cryptography
  • [H2] Food
  • [H2] Linux/Unix stuff, programming
  • [H2] Linux/Unix software
  • [H2] Friend & family pages
Images We found 0 images on this web page.

Awesome! Most or all of your images have alt attributes.
Text/HTML Ratio Ratio : 57%

Ideal! This page's ratio of text to HTML code is between 25 and 70 percent.
Flash Perfect, no Flash content has been detected on this page.
Iframe Great, there are no IFrames detected on this page.

URL Rewrite Your links have query strings. This is not very readable for your users.
Underscores in the URLs We have detected underscores in your URLs. You should rather use hyphens to optimize your SEO.
In-page links We found a total of 90 links including 11 link(s) to files

Anchor Type Juice
Netherlabs External Passing Juice
PowerDNS External Passing Juice
Linkedin External Passing Juice
PowerDNS Twitter External Passing Juice
Non-PowerDNS Twitter External Passing Juice
Wikipedia External Passing Juice
Blog External Passing Juice
PowerDNS Blog External Passing Juice
GitHub External Passing Juice
Food, nutrition, science, health Internal Passing Juice
Startup, business related Internal Passing Juice
Publications Internal Passing Juice
Presentations Internal Passing Juice
Random Internal Passing Juice
Cryptography Internal Passing Juice
Food Internal Passing Juice
Programming Internal Passing Juice
Software Internal Passing Juice
Friends & family pages Internal Passing Juice
Needleman-Wunsch alignment demo in Javascript Internal Passing Juice
Antonie External Passing Juice
On how to average Sanger Q Scores in DNA Sequencing Internal Passing Juice
Some notes on how to upload FASTQ to the European Nucleotide Archive Internal Passing Juice
Hello, and welcome to the wonderful world of DNA sequencing External Passing Juice
The biggest bet of your life External Passing Juice
Towards a new nutritional consensus Internal Passing Juice
Tin cans, can openers and solar power: explaining the snail’s pace of innovation External Passing Juice
Will your startup idea be successful? I don’t know. But here’s a checklist before you approach people who could help you. External Passing Juice
Being a sophisticated & credible customer External Passing Juice
Small collection of links that helped shape my thinking on how to do business External Passing Juice
Interview from book 'De natuurkundige ondernemer' by Kees van den Bos and Witek Nawara (Dutch) Internal Passing Juice
Felix Hol, Bert Hubert, Cees Dekker, Juan Keymer. Density-dependent adaptive resistance allows swimming bacteria to colonize an antibiotic gradient External Passing Juice
Using DNS for fun and profit External Passing Juice
Startup Grind Rotterdam External Passing Juice
DNS Matters - Why Subscribers are leaving You: Not Measuring your Customer Experience External Passing Juice
Video External Passing Juice
slides External Passing Juice
Programming workshop for physics students: skipping the first 20 years Internal Passing Juice
How industry looks at physics and bionano students Internal Passing Juice
dnsdist - DNS, latency and DoS-aware load balancing External Passing Juice
Video External Passing Juice
PowerDNS in 2014 - DNS round table External Passing Juice
Yes!Delft External Passing Juice
1•2•Startup External Passing Juice
Computer Programming & Physics Internal Passing Juice
OHM2013 External Passing Juice
What you need to know about what you eat: health & weight Internal Passing Juice
How to give a good presentation for hackers, engineers, geeks & scientists External Passing Juice
Implementing Full IPv6 Support: More than Binding to an AF_INET6 Socket External Passing Juice
Video! External Passing Juice
A surprising discovery on converting IPv6 addresses: we no longer prefer getaddrinfo() External Passing Juice
Eten, hoe werkt het & hoe beïnvloedt het mijn gezondheid Internal Passing Juice
Video External Passing Juice
Van 27 tot 1.342.465 domeinnamen met DNSSEC in Nederland: hoe dat komt en wat hebben we geleerd External Passing Juice
DNSSEC & PowerDNS Large Scale DNSSEC Deployments External Passing Juice
From engineer to entrepreneur, or, "I mastered Quantum Mechanics, but do I have what it takes to start my own company?" External Passing Juice
Modern operating systems External Passing Juice
How we lost the trusted computing base External Passing Juice
On the end of secure computing on general purpose hardware External Passing Juice
YouTube External Passing Juice
"DNSSEC: Reality & Utility - what problems does it solve today" External Passing Juice
"Security Aspects of IPv6" External Passing Juice
"Science in Software innovation" External Passing Juice
"DNSSEC the good, the bad and the ugly" External Passing Juice
"DNSSEC zonder (al) te veel moeite" External Passing Juice
"DNS Security in the Broadest sense" Internal Passing Juice
"DNS as a carrier of ENUM and other VoIP routing information" Internal Passing Juice
"Progress report on the PowerDNS Recursor" Internal Passing Juice
"All about the PowerDNS Nameserver" Internal Passing Juice
"On faster application startup times: Cache stuffing, seek profiling and adaptive preloading" Internal Passing Juice
"Traffic Control for the User and Developer" Internal Passing Juice
"on CBQ/HTB" Internal Passing Juice
Oldest proof of me on the internet (1992) External Passing Juice
Secrets in Public: Diffie-Hellman key exchange External Passing Juice
On Secure Remote Password External Passing Juice
Bitcoins explained for normal people -or- please get back to work External Passing Juice
The perfect error message External Passing Juice
How to talk to an open source project as a large scale or otherwise interesting user External Passing Juice
Help, my sin() is slow and my FPU is inaccurate External Passing Juice
C++ books I recommend External Passing Juice
Linux 2.4 Advanced Routing & Traffic Shaping HOWTO External Passing Juice
Getting Linux 2.6 to work on a Dell Latitude D800 Internal Passing Juice
Linux Logical Volume Management HOWTO Internal Passing Juice
Lex & YACC HOWTO Internal Passing Juice
Some evil ideas about decentralised loadbalancing/clustering, with no single point of failure Internal Passing Juice
dnsdist External Passing Juice
Weakforced External Passing Juice
Tool to display your logical volumes Internal Passing Juice
Bertus Beaumont Lab External Passing Juice
Studiebegeleiding, afstudeerbegeleiding by my lovely wife Mirjam External Passing Juice

SEO Keywords

Keywords Cloud powerdns how dns june video dnssec from howto delft linux
Keywords Consistency
Keyword Content Title Description Headings
how 11
june 11
powerdns 11
linux 10
dnssec 9


Url Domain : ds9a.nl
Length : 7
Favicon We have not found a favicon icon. You can create one over here for multiply devices and sizes: http://www.favicon-generator.org
Printability We could not find a Print-Friendly CSS.
Language You have not specified a language.


Doctype HTML 5
Encoding Perfect. Your declared charset is UTF-8.
W3C Validity Errors : 8
Warnings : 3
Email Privacy Warning! At least one email address has been found in plain text. Your email address will be used for spam. Please consider one of these options:

1. Integrate a contact form on your site.
2. Make it difficult for spam bots by using an obfuscator: Email Address Obfuscator
Deprecated HTML
Deprecated tags Occurrences
<font> 1
Deprecated HTML tags are HTML tags that are no longer used. It is recommended that you remove or replace these tags because they are now considered obsolete.
Speed Tips
Excellent, your website doesn't use nested tables.
Perfect. No inline css has been found in HTML tags!
Great, your website has a few CSS files.
Perfect, your website has a few JavaScript files.
Your website does not take advantage of gzip.


Mobile Optimization
Apple Icon
Meta Viewport Tag
Flash content


XML Sitemap Missing

Your website does not have an XML sitemap - to make it easier for search engines to find your pages it is wise to generate a sitemap.

A sitemap lists URLs that are available for crawling and can include additional information like your site's latest updates, frequency of changes and importance of the URLs. This allows search engines to crawl the site more efficiently.

Go here to know more on how to set this up: http://www.sitemaps.org/protocol.html

If you have a lot of pages (up to 500 pages is free) you can auto generate them here: https://www.xml-sitemaps.com
Robots.txt Missing

Your website doesn't have a robots.txt file - this can be problematic.

A robots.txt file allows you to restrict the access of search engine robots that crawl the web and it can prevent these robots from accessing specific directories and pages. It also specifies where the XML sitemap file is located.

For more information on how to do this: www.robotstxt.org
Analytics Missing

We didn't detect an analytics tool installed on this website.

Web analytics let you measure visitor activity on your website. You should have at least one analytics tool installed, but it can also be good to install a second one in order to cross-check the data. This can be Google Analytics or Clicky.com

PageSpeed Insights


Clicky Web Analytics