A message posted at the site's usual homepage explains that it was the "target of a cyber incident" and that it has been shut down out of caution to preserve client and customer data.
The Eventbrite-owned Ticketfly expanded into Canada back in 2015, following the acquisition of Northern Tickets.
In addition to its ticket-selling service, the website also hosts an array of venue sites on its servers. Some of the Canadian venues affected include the Horseshoe Tavern and the Opera House in Toronto and the Vogue Theatre in Vancouver.
Read the company's full statement on the hack below.
Following recent site issues, we determined that Ticketfly has been the target of a cyber incident. To protect our clients and fans, and to secure the website and related data, we have temporarily taken all Ticketfly systems offline. We'll keep you updated.— Ticketfly (@ticketfly) May 31, 2018