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Published in the Journal of Pharmacology and Experimental Therapeutics, researchers found that subjects urinated up to 50% more when they drank caffeinated water and coffee

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Since then, however, numerous studies have shown this not to be the case

Caffeine as a Diuretic

Caffeine does, however, have a mild diuretic effect

Evidence shows that caffeine acts on the kidneys by inhibiting sodium reabsorption in the proximal and distal tubules, thus increases the solute excretion and consequently free water excretion

Caffeine competitively antagonizes the adenosine receptors (AR), which are G protein-coupled receptors largely distributed throughout the body, including brain, heart, vessels and kidneys

Caffeine also inhibits Na(+) reabsorption at the level of renal proximal tubules

Caffeine does so by increasing blood flow to your kidneys, which spurs them to release more water through urine

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But how does this transfer over to real life? - Coffee & Dehydration Studies

Though the caffeine in coffee may have a diuretic effect, it’s unlikely to dehydrate you

A study in 10 casual coffee drinkers reviewed the impact of drinking 6.8 ounces (200 ml) of water, lower caffeine coffee (269 mg of caffeine), and high caffeine coffee (537 mg of caffeine) on signs of dehydration.

Researchers observed that drinking the higher caffeine coffee had a short-term diuretic effect, whereas the lower caffeine coffee and water were both hydrating

Coffee ingestion at the HCAF trial induced greater diuresis during the 3-h period (613 ± 101 mL), when compared to W (356 ± 53 mL) and LCAF (316 ± 38 mL).

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In addition, other studies show that moderate coffee intake is as hydrating as drinking water:
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When you drink a cup of coffee you are also drinking a large amount of fluid (water) with the caffeine, which is hydrating - on average, you'd need to drink more than 500mg in a day for it to have a dehydrating effect

Additional References

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