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How to do this by looking only at the hexadecimal values of an address?
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See the options for each instruction in the 80x86 Instruction-set. There is a table mapping each instruction with its Hexa opcode. When identifying the Opcode see which instruction in Assembly corresponds to it.
The biggest problem is whether what you’re looking at in a binary is an instruction or an operand or an operator or a data in the Data Segment. You will only succeed if you are sure what you are looking at is really Opcode.
https://en.wikipedia.org/wiki/X86_instruction_listings#Original_8086.2F8088_instructions
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You need a disassembler. Trying to do it by hand is hard work, risky and problematic, as well as needing a book to explain. Has a online.
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vlw more wanted to know how to do it manually same
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Intel makes available on the site material on processor instructions (machine language) for download. And until a while ago they sent by mail to the person’s home. From there the USA. I do not know the documentation page of the processors now.
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