Dr. Mark Humphrys

School of Computing. Dublin City University.

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Online coding site: Ancient Brain

Free course: Online AI programming exercises


CA114      CA170

CA668      CA669      Projects

  How to find your IP address

Do lookups online

Network tools

Linux / UNIX


Look up who owns yahoo.com
Look up who owns the "typo" yahooo.com
What is the smallest number of o's before someone outside Yahoo owns the domain?
What is the smallest number of o's before no one owns the domain?
See Typosquatting



Visual TraceRoute using Google Maps.
Does trace from US server outwards.
Transatlantic link may be ocean floor cable or may be satellite.

ancientbrain.com      w2mind.org      humphrysfamilytree.com

On the Internet since 1987.

Wikipedia: Sometimes I link to Wikipedia. I have written something In defence of Wikipedia. It is often a useful starting point but you cannot trust it. Linking to it is like linking to a Google search. A starting point, not a destination. I automatically highlight in red all links to Wikipedia and Google search and other possibly-unreliable user-generated content.