The internet service providers operator in Ireland, Airel, will close in April following almost 20 years in business.
Airely was formed by the merger of Irish broadband provider, Teleport and telecoms giant Oireachtas.
The company had more than 500 employees, most of them in the capital.
The move comes after a number of companies, including Facebook and Google, announced plans to expand their services.
Airtel had been in talks to close its Irish office in Dublin in May, but that agreement has not been signed yet.
It will now close its offices in Dublin, Limerick, Cork and Donegal in April.
Facebook Ireland managing director, Nick Jones, said: “The internet has changed the way we communicate, what we do, and what we see in the world.
It is a world-class platform and our customers are among the most engaged and creative in the country.”
We are confident that with the right investments in infrastructure, digital technology, and innovation, we can continue to provide this amazing service for decades to come.
However, we are working with our existing employees and other stakeholders to deliver a world class service to the vast majority of our customer base,” a spokesperson said. “
We know that today’s announcement will come as a surprise to many of our customers.
However, we are working with our existing employees and other stakeholders to deliver a world class service to the vast majority of our customer base,” a spokesperson said.
The letter says that “the service that our customers rely on to access and share their content is at a time of tremendous change, which is driving a new era of innovation and opportunity for everyone.”
This will include “a shift to mobile technology, as well as a new and exciting era of social, mobile and connected experiences.”
The new era will include more mobile users, and the growth of our services, including new ways to connect, and a broad range of new products and services, such as mobile gaming, video sharing, social networking and entertainment,” the letter adds.
Oireális Irish Government has announced that it will continue to operate as an independent entity until 31 March 2020.
It said the company had taken a number to its decision to close.
In a statement, Minister for Communications Richard Bruton said that the decision to sell off Aireles was “an incredibly challenging one for our industry and for all of us in Ireland.
Oirelles customers will continue with the services offered by the company. “
It is a difficult decision for everyone involved in our business, and one which will have a profound effect on the company and its staff.”
Oirelles customers will continue with the services offered by the company.
A number of other internet services, which were bought by Airell last year, will continue operating, but will be sold off to a new operator.
A spokesman for Airels parent company, Oireach, said the decision had been taken following a long and thoughtful process of due diligence.
A spokesperson for Telstra, which owns Oireacl, said it had also made a decision to end its relationship with Airela.
Telstra has about 6,000 staff across Ireland and the majority of its services are available to Irish customers.
Telcos have been looking to close their Irish offices in recent years, after it emerged that a number were being used for tax avoidance and other tax fraud.