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What does 426 stand for?

426 stands for Upgrade Required (HTTP status code)

This definition appears very frequently and is found in the following Acronym Finder categories:

  • Information technology (IT) and computers

Samples in periodicals archive:

With just eight months to go before Donington is due to stage the race, time is fast running out on Gillett to carry out the multi-million pound upgrade required to turn the venue into a F1-ready circuit.
Also, a Windows upgrade required a major hardware upgrade, and, unlike now, hardware was relatively expensive.