RFC 1924 Version
Published on April 1, 1996, and thus presumably not meant to be taken completely seriously, informational RFC 1924: "A Compact Representation of IPv6 Addresses" by Robert Elz suggests a base-85 encoding of IPv6 addresses. This differs from the scheme used above in that he proposes a different set of 85 ASCII characters, and proposes to do all arithmetic on the 128-bit number, converting it to a single 20-digit base-85 number (internal whitespace not allowed), rather than breaking it into four 32-bit groups.
The proposed character set is, in order, 0–9, A–Z, a–z, and then the 23 characters !#$%&*+-;<=>?@^_`{|}~. The highest possible representable address, 2128−1 = 74×8519 + 53×8518 + 5×8517 + ..., would be encoded as =r54lj&NUUO~Hi%c2ym0.
While the RFC chose a different character set in order to prevent the use of certain problematic characters ("',./:\), it still requires escaping for SGML-based protocols, notably for XML.
Read more about this topic: Ascii85
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