Today, around 12:50 Moscow time, all reg.ru services, including dns-servers, fell. The whole site, the domains of which are delegated to reg.ru, also stopped working.
News on roem:
roem.ru/21-03-2016/221280/regru-fallupd: as of 13:45 Moscow time, the work of ns-servers is restored. The site reg.ru is still not available.
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upd2: 13:57 MSK Reg.ru website earned.
upd3: reg.ru reports that the fall was caused by a DDoS attack, a link to the official page in vk:
vk.com/wall-16725543_16800