KPN is a Dutch landline and mobile telecommunications company. KPN originated from a government-run postal, telegraph and telephone service and is based in Rotterdam, Netherlands.

What is now KPN was first officially established as a postal service called the Statenpost in 1752. . In 1893, postal system and telegraph and telephone services were brought together to form the Staatsbedrijf der Posterijen, Telegrafie en Telefonie (approximately, “National corporation for Postage, Telegraphy and Telephony”), shortened to PTT or internationally as PTT-NL. On 1 January 1989, the PTT was corporatised and reorganised as a private business known as Koninklijke PTT Nederland (“Royal PTT Netherlands”), shortened to KPN or PTT Nederland.

In the Netherlands, KPN has 6.3 million fixed-line telephone customers. Its mobile division, KPN Mobile, had more than 33 million subscribers in the Netherlands, Germany, Belgium, France, and Spain under different brand names. Through its ownership of several European Internet service providers, KPN also provides Internet access to 2.1 million customers, and it offers business network services and data transport throughout Western Europe.

KPN operates a mobile services network for 2G GSM, 4G LTE, and 5G NR technologies. It uses the 700 MHz, 800 MHz, 900 MHz, 1400 MHz, 1800 MHz, 2100 MHz and 2600 MHz bands.

KPN strives to connect everybody and everything in a sustainable way. Since 2011, they’ve been using 100% green electricity and they’ve been completely climate neutral since 2015. KPN is committed to the United Nations Sustainable Development Goals. There are 17 goals for sustainable development that are in force from 2015 to 2030. KPN was ranked as one of the most sustainable corporations by Corporate Knights.

According to wikipedia