If you own a brand and want to really protect it online, a basic action would require you to buy more than 250 domain names.
280 is indeed the number of domain extensions in total:
- 20 generic TLD (.com, .net, .biz, .edu … to name a few)
- 248 country code TLD (.fr, .de, .th, .us, .uk, .ru, .cm to name a few)
- 1 historic extension: .arpa
- 11 would be extensions currently in testing phase.
So to be sure that no one can buy you brand name online, you need to register 268 domains. And then you might need to consider some common typos and hyphen versions and key product names.
Have you done it yet?