Namecheap After years of being #1 in this Top 20, Namecheap (US) continues to be the preferred domain registrar for miscreants registering botnet C&C domains.
Spamhaus believes that given the long history of abuse at Namecheap, this won’t change any time soon.
Eranet International & RegRU With a massive 249% increase, Eranet International (China) knocked NameSilo (United States) off its #2 spot. However, the most significant increase in the number of botnet C&C domain registrations belongs to RegRU (Russia), with a whopping 341% increase.
See here the most abused top-level domains, Q1 2021.
Most abused domain registrars – number of domains
You can read the complete Spamhaus report here.