Re:Potholes to avoid when migrating to IPv6
by tzs on Monday December 31, 2018 @01:33PM
(#18796089)
> Having more than a single valid form of an address again only serves to confuse.
IPv4 address also have multiple valid forms. Besides the most common form, a.b.c.d where a, b, c, and d are decimal numbers in [0, 255] representing four 8-bit parts of a 32-bit address, there is a.b.c form, where a and b are decimal numbers in [0-255] and c is a decimal number in [0-65535], representing two 8-bit parts and one 16-bit part of a 32-bit address. Then there is a.b form where a is a decimal number in [0-255] and b is a decimal number in in [0-16777216], representing an 8-bit part and a 24-bit part of a 32-bit address. There is also a form, where a is a 32-bit decimal number, representing a 32-bit address.
Any of the aforementioned decimal numbers may instead be given in octal by prefixing with 0, or hex by prefixing with 0x or 0X.
IPv4 address also have multiple valid forms. Besides the most common form, a.b.c.d where a, b, c, and d are decimal numbers in [0, 255] representing four 8-bit parts of a 32-bit address, there is a.b.c form, where a and b are decimal numbers in [0-255] and c is a decimal number in [0-65535], representing two 8-bit parts and one 16-bit part of a 32-bit address. Then there is a.b form where a is a decimal number in [0-255] and b is a decimal number in in [0-16777216], representing an 8-bit part and a 24-bit part of a 32-bit address. There is also a form, where a is a 32-bit decimal number, representing a 32-bit address.
Any of the aforementioned decimal numbers may instead be given in octal by prefixing with 0, or hex by prefixing with 0x or 0X.