Note
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Classic gamertags supports only ASCII characters a-z, A-Z, 0-9, comma (,), and space (ASCII character 0x20).
String length and buffer size
The classic gamertag is 16 characters long, with a maximum of 15 characters and a null terminator.
Similarly, the maximum size of classic gamertag buffer is 16 bytes, including the space for the null terminator. 15 US-ASCII characters and 1-byte null terminator, equals 16 bytes.
Advantage
There are new titles that still choose to support classic gamertags for its straightforward implementation.