As of 10/10/2015, no live official trademarks were found on USPTO.gov for the exact terms/numbers
In Chinese culture triple 8's are considered to be especially lucky.
As an ordinary 9-number domain, this number may mean little to average Occidentals (other than as an easy-to-remember cool pattern); heck, we don't fully understand the premise, either. However...
In the Chinese market, "8" is the luckiest number; "2" is also a lucky number, because all good things come in pairs; "0" represents wholeness and unity.
This domain is also a palindrome, which means the numbers are the same when read backwards, thus adding another level of mystique to the numerical pattern.
We cannot even fathom what 8.com, 88.com, 888.com, and 8888.com are worth -- probably much more than the average investor could afford.
Long repeating 8's are prized as well. In fact, 5, 6, 7, 8, 9, and even 10+ repeating 8's are commanding excellent prices these days.
Evidently, every possible string of 8's have been registered in .com, all the way up to the longest one.
Finally, repeating 8's with other lucky numerals are becoming rare as hand registrations (fresh from the registrar) and are also highly prized.
Chinese demand for numerals is HUGE and increasing each day.
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