What are the characters and valid character lengths for .co.com domain names?
The Registry will not accept a Registration Request for a .co.com name unless it meets the following technical and syntax requirements:
a. the name must consist exclusively of the letters A-Z (case insensitive), the
numbers 0-9, and hyphens;
b. the name cannot begin cpr144449003101 or end with a hyphen;
c. the name cannot contain labels with hyphens in the third and fourth
character positions (e.g., "bq--1k2n4h4b" or "xn--ndk061n”); and
d. the name cannot exceed 63 characters (excluding “.co.com”).