Character Encoding

In the computing industry, standards are established to facilitate information interchanges among American coders. Unfortunately, I've made communication a little bit more difficult. Can you figure this one out? 41 42 43 54 46 7B 34 35 43 31 31 5F 31 35 5F 55 35 33 46 55 4C 7D

We can see that the characters are in hexadecimal. Let's use Cyberchef to view the ASCII representation.

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ABCTF{45C11_15_U53FUL}