Impossible in Hexadecimal

69 6D 70 6F 73 73 69 62 6C 65

Character Breakdown

Char	Hex	Decimal
i	0x69	105
m	0x6D	109
p	0x70	112
o	0x6F	111
s	0x73	115
s	0x73	115
i	0x69	105
b	0x62	98
l	0x6C	108
e	0x65	101

Impossible in Other Codes

Impossible in Morse Code Impossible in Binary Impossible in Braille Impossible in NATO Alphabet