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Stop Using "internal" Top Level Domain Names - SANS Internet Storm Center ( (SANS Internet Storm Center著, 2017-09-27 12:59:12 +09:00)) https://isc.sans.edu/forums/diary/Stop+Using+internal+Top+Level+Domain+Names/21095/

- .top : From my own experience, this TLD is exclusively used for spam. Let me know if you find legitimate use of this gTLD