Computing Atlas

Flag Day: the Internet Before the Web

09/20/2026 12:00:00 AM

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This atlas records the internet's own founding year as 1983, not as the date any single network first switched on. The reason is a specific event: ARPANET's own formal switch to the TCP IP protocols on January 1, 1983, an event the engineers of the day called flag day. That cutover, not the invention of any one network, is commonly treated as the point at which the internet in its modern sense began to exist, because TCP IP was the common set of rules that let any network join simply by speaking the same protocol, replacing the patchwork of earlier, incompatible schemes ARPANET and its peers had used before.
This atlas records the internet's own founding year as 1983, not as the date any single network first switched on. The reason is a specific event: ARPANET's own formal switch to the TCP IP protocols on January 1, 1983, an event the engineers of the day called flag day. That cutover, not the invention of any one network, is commonly treated as the point at which the internet in its modern sense began to exist, because TCP IP was the common set of rules that let any network join simply by speaking the same protocol, replacing the patchwork of earlier, incompatible schemes ARPANET and its peers had used before.

Older than the web it is often confused with

TCP IP itself was developed chiefly by Vinton Cerf and Robert Kahn, so the 1983 date really marks their protocol becoming the network standard rather than the moment computer networking began. It also means the internet, on this atlas's own dating, is older than most people assume relative to the part of it they actually use: the World Wide Web did not arrive until 1991, eight years after flag day, as one addition built on top of a network that already existed. The network then kept growing well beyond either date, through the 1990s opening of the internet to commercial and public use that turned a research and defense project into the everyday one.

Older than the web it is often confused with

TCP IP itself was developed chiefly by Vinton Cerf and Robert Kahn, so the 1983 date really marks their protocol becoming the network standard rather than the moment computer networking began. It also means the internet, on this atlas's own dating, is older than most people assume relative to the part of it they actually use: the World Wide Web did not arrive until 1991, eight years after flag day, as one addition built on top of a network that already existed. The network then kept growing well beyond either date, through the 1990s opening of the internet to commercial and public use that turned a research and defense project into the everyday one.

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