printf "%0x\n", $_ for unpack 'V2', "\x45\xd2\xff\x76\x89\x3a\x00\x33";;
76ffd245
33003a89

#or 

printf "%0x\n", $_ for unpack 'L<2', "\x45\xd2\xff\x76\x89\x3a\x00\x33";;
76ffd245
33003a89

##</code><code>##

c:\test>od -t xC src.bin
0000000 45 d2 ff 76 89 3a 00 33
0000010

c:\test>od -t x2 src.bin
0000000 d245 76ff 3a89 3300
0000010

c:\test>od -t x4 src.bin
0000000 76ffd245 33003a89
0000010