The Quote Of The Day (QOTD) service is an Internet Protocol defined in Request for Comments 865. It is intended for testing and measurement purposes.

A host may connect to a server that supports the QOTD protocol, on either Transmission Control Protocol or User Datagram Protocol port 17. The server then returns a short arbitrary message. This was traditionally a random selection from a list of notable quotes.

The QOTD service is rarely enabled, and is in any case often firewalled. Current testing and measurement of IP networks is more commonly done with Ping and Traceroute.

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