IP address can be written 121 ways (lucb1e.com)

The list lists four different ways: dotted, decimal, hex and octal. The other 117 entries are just combinations of the four.

obviously FF not running these through POSIX inet_pton

"The inet_pton() function does not accept other formats (such as the octal numbers, hexadecimal numbers, and fewer than four numbers that inet_addr() accepts)."

The site is dead (for me) but I guess it is "just" about IPv4 and there is something I learned about IPv4 notation that has been hidden for me for the last 30 years:

1.1 expands to 1.0.0.1

1.1.1 expands to 1.1.0.1