This ensures that the data remains intact without modification during transport. Properly adhering to these three rules means the address you are left with will correspond properly to the full-length version that you started with. When the term "Base64" is used on its own to refer to a specific algorithm, it typically refers to the version of Base64 outlined in RFC 4648, section 4, which uses the following alphabet to represent the radix-64 digits, alongside = as a padding character: ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/Ī common variant is "Base64 URL safe", which omits the padding and replaces +/ with -_ to avoid characters that might cause problems in URL path segments or query parameters.īase64 encoding schemes are commonly used to encode binary data for storage or transfer over media that can only deal with ASCII text (or some superset of ASCII that still falls short of accepting arbitrary binary data). To properly compress an IPv6 address down into something more manageable and easier to use, there are three rules that you must follow. The term Base64 originates from a specific MIME content transfer encoding.
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