\(
\newcommand{\P}[]{\unicode{xB6}}
\newcommand{\AA}[]{\unicode{x212B}}
\newcommand{\empty}[]{\emptyset}
\newcommand{\O}[]{\emptyset}
\newcommand{\Alpha}[]{Α}
\newcommand{\Beta}[]{Β}
\newcommand{\Epsilon}[]{Ε}
\newcommand{\Iota}[]{Ι}
\newcommand{\Kappa}[]{Κ}
\newcommand{\Rho}[]{Ρ}
\newcommand{\Tau}[]{Τ}
\newcommand{\Zeta}[]{Ζ}
\newcommand{\Mu}[]{\unicode{x039C}}
\newcommand{\Chi}[]{Χ}
\newcommand{\Eta}[]{\unicode{x0397}}
\newcommand{\Nu}[]{\unicode{x039D}}
\newcommand{\Omicron}[]{\unicode{x039F}}
\DeclareMathOperator{\sgn}{sgn}
\def\oiint{\mathop{\vcenter{\mathchoice{\huge\unicode{x222F}\,}{\unicode{x222F}}{\unicode{x222F}}{\unicode{x222F}}}\,}\nolimits}
\def\oiiint{\mathop{\vcenter{\mathchoice{\huge\unicode{x2230}\,}{\unicode{x2230}}{\unicode{x2230}}{\unicode{x2230}}}\,}\nolimits}
\)
Local Addresses
See https://datatracker.ietf.org/doc/html/rfc4193#section-3
The summary is that your subnet is commonly a /64 where the first 8 bits are 0xFD, the next 40 bits are random, and the last 16 bits are a subnet ID of your choosing. The 40 random bits make collisions unlikely.
import random <br />
prefix = f"{0b11111101:02x}" # 0xfd
random_bits = f"{random.getrandbits(40):010x}" # 40 random bits
# subnet_id = f"{random.getrandbits(16):04x}" # 16 bits of your choice
subnet_id = "0000"
ip = prefix + random_bits + subnet_id
ip = ":".join((ip[4*x:4*x+4] for x in range(len(ip)//4)))
print(ip)