I quickly setup an account to see how many name servers you are offering. There only appear to be two primary name servers that are within the same netblock. Bo

I quickly setup an account to see how many name servers you are offering. There only appear to be two primary name servers that are within the same netblock. Both IPs appear to be announced by the same ASN from the same location. So your clients are one medium level denial of service attack away from a complete outage. Doing your own IP anycast requires some heavy investments but sometimes you can work with providers that have multiple locations to setup anycast in their IP block. Denial of service attacks are something you just deal with when you offer low cost or free services like these. You are going to have a lot of unsavory types register and start hosting sites from your name servers; and even after you terminate the record your name server still has to deal with responding with NXDOMAIN.