When you see a Ticketmaster subdomain, it is natural to assume it is legitimate. But arceast.hosted.ticketmaster.com does not behave like a typical Ticketmaster page. The subdomain has no presence in the Wayback Machine, no favicon, and no contact information or privacy policy visible. While the security settings like HTTPS are in place, the lack of transparency is a real problem for a site that likely processes event bookings or ticket sales.
Most established entertainment ticketing sites have clear links to their parent company's support and legal pages. This one does not. The WHOIS record returns no match, which is odd even for a subdomain. I could not confirm who actually owns or operates this page.
If you are asking is arceast.hosted.ticketmaster.com a scam, the evidence does not support a definite conclusion either way. But is it safe to buy from arceast.hosted.ticketmaster.com? At this point, I would say no. The signals suggest a very new or temporary setup, and the missing legal protections mean you have no recourse if something goes wrong. Wait until Ticketmaster publicly acknowledges this subdomain or you can verify it through official channels before entering any data.