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A comprehensive overview of the Unicode characters, covering 161 modern and historical scripts, as well as multiple symbol sets. Learn how to reference Unicode characters using numeric or entity codes, and see the control codes and special characters.
This web page provides a comprehensive list of TCP and UDP port numbers used by various network applications and protocols. It also explains the meaning of well-known, registered, and dynamic ports, and the legend of the table cells.
E.164 is an ITU-T standard that defines a general format for international telephone numbers with up to fifteen digits. It includes country codes, global services, networks, groups of countries, and trials categories, and provides guidance on printing and DNS mapping of E.164 numbers.
Learn how telephone numbers are written and dialed in different countries and regions, according to the ITU recommendation E.123. Compare the formats, lengths, prefixes and codes of landline, mobile, toll free and service numbers.
ExxonMobil is an American multinational oil and gas corporation and the largest direct descendant of Standard Oil. It operates worldwide, produces about 3% of the world's oil and 2% of the world's energy, and has been involved in many environmental incidents and climate change denial.
Find the mobile prefixes for different countries and territories, including Afghanistan, Åland, Algeria, American Samoa, Andorra, Angola, Antigua and Barbuda, Argentina, Armenia, Aruba, Ascension Island, Australia, Austria, etc. The web page also shows the international calling codes, the size of NN (NSN), and the carriers for each prefix.
Learn how ExxonMobil, the largest oil and gas company in the world, evolved from Standard Oil, founded by John D. Rockefeller in 1870. Find out when Exxon and Mobil merged in 1999 and how they became the successors of Standard Oil.
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.