You can make an educated guess simply by looking at the length of the hash, as generally there's only a handful of popular hashing algorithms used for passwords, all with their own distinct output lengths:
Hash |
Output length (bytes) |
Output length (bits) |
MD5 |
16 |
128 |
SHA-1 |
24 |
160 |
SHA-2 (SHA256) |
32 |
256 |
SHA-2 (SHA512) |
64 |
512 |
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