When RegisterONE first launched, it was served under registerone.US because it was the beta top level domain available. We have recently acquired the registerone.COM domain name and are now serving our services under it instead of .us.
This will serve to increase business-to-consumer (B2C) recognition and will ultimately serve our customers better since the visibility and exclusivity of the brand will be served under the most popular top level domain (TLD).
You can still visit www.registerone.us if you like. We like what is stands for!