The ARPANET project began with its seed ideas, as early as 1962. From the page below, you can read:
"First ARPANET IMP log: the first message ever sent via the ARPANET, 10:30 pm, 29 October 1969."
The direct answer to your question, then, is sometime between 1962 and October 29, 1969, depending on your definition of 'constructed'.
ARPANET was developed
In 1969, ARPA funded the creation of the ARPANET. The ARPANET was the precursor to today's internet and was initially connected Stanford, University of California's campuses, and the University of Utah.
The first public internet, known as the ARPANET, was developed by the U.S. Department of Defense's Advanced Research Projects Agency (ARPA) in the late 1960s. Key figures in its creation included computer scientist Leonard Kleinrock, who contributed to the theoretical foundations of packet switching, and Robert Taylor, who helped to secure funding and support for the project. The ARPANET became the first operational packet-switching network and laid the groundwork for the modern internet.
ARPANet was the forerunner to the modern internet. After World War II the American Government set up the Defence Advanced Research Projects Agency (DARPA). One of their tasks was that they had to design a communications system that would not collapse if part of it was knocked out by a bomb. ARPANet was the result of this, in about 1969. In the following decades more networks were set up and linked together. Common standards between all these systems were agreed upon and in 1989, the internet came into being.
The first internet-based email service was called ARPANET, which was developed in 1971 by Ray Tomlinson.
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ARPANET
there is no single person responsible for the internet. In the 1970s there was anetwork of university libraries that shared files electronically, and the concept grew and developed from there.
uses of arpanet
ARPANET.
yea ARPAnet
ARPANET was decommissioned in 1990.
ARPANET ceased to exist in 1990, so it was not around in 1996. What was around then, and what ARPANET had a part in creating, was the internet. ARPANET itself, dated back to 1969.
ARPAnet eventually developed into the World Wide Web.
ARPANET (Advanced Research Projects Agency Network) was an early packet switching network that became the technical foundation of the Internet.
IPTO orinaly created the ARPANET but several other like 'lick Licklider and Lawrence Roberts helped too
The Internet as we know it today is based on Arpanet.