Serbian (.rs) domain registrar (and apparently DNS) is under a DDoS attack
bikegremlin
ModeratorOG
in Outages
Many .rs domain websites are down.
Or up-down-up-down today.
Emails seem to be working OK-ish.
According to the Serbian domain authority
https://www.rnids.rs/
the problem is caused by a DDoS attack.
I've got no confirmed, nor detailed info, apart from the fact that the outages are really happening.
Fortunatelly, no service or business is impaced:
Camo .Com Crbina Cpašava!
Detailed info about providers whose services I've used:
BikeGremlin web-hosting reviews