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Hash functions are used in conjunction with hash tables to store and retrieve data items or data records. The hash function translates the key associated with each datum or record into a hash code, which is used to index the hash table.
John Smith and Sandra Dee share the same hash value of 02, causing a hash collision. In computer science, a hash collision or hash clash [1] is when two distinct pieces of data in a hash table share the same hash value.
There is an IP check available to certain developers for checking IPs, however this is only used in limited circumstances. The objection to making this more widely available have been on the grounds of privacy.