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Learn about the format, types, and area codes of telephone numbers in Japan. Most numbers are 10 digits long, except for special numbers (3 digits) and non-geographic numbers (10 or 11 digits).
Learn how to dial phone numbers in France and its overseas territories, including the country code +33 and the international access code 00. Find out the history and format of the French telephone numbering plan and its changes over time.
Learn how to dial phone numbers in different European countries and territories, including country codes, national number lengths, and international access codes. Find out the European Union roaming and calling regulations and the harmonized service numbers.
Learn about the format, structure and history of telephone numbers in Italy, including the country code +39 and the area codes. Find out how to dial emergency and service numbers, mobile numbers, toll-free numbers and more.
Learn about the telephone numbering plan of the Netherlands, including geographical, non-geographical, and special public resource numbers. Find out the area code for Zevenaar, which is 0316, and how to dial it from within or outside the country.
Find out the telephone prefixes for reaching telephone subscribers in foreign countries or areas via international telecommunication networks. The list is organized by world zones and includes the ITU-T standards and the exceptions for political and historical alignment.
A CSPRNG is a PRNG with properties that make it suitable for use in cryptography. It can stretch the available entropy over more bits and resist state compromise attacks. Learn about its background, definitions and designs based on cryptographic primitives or mathematical problems.
Open Location Code (OLC) is a way of encoding location into a form that is easier to use than coordinates. It was developed at Google's Zürich engineering office and released in 2014. Learn how OLC works, its applications and specifications.