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zhangyoufu/gist:eb429891f07d593a956476cf483e3944

Created January 28, 2026 07:18
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generate random subnet from fc00::/7 ULA prefix
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gistfile1.txt
import ipaddress
import random
def generate_random_ula_prefix(prefix_length: int, L: int = 1) -> ipaddress.IPv6Network:
return ipaddress.IPv6Network((((0xfc|L)<<120)|(random.getrandbits(prefix_length-8)<<(128-prefix_length)), prefix_length))
for prefix_length in range(8, 129):
print(generate_random_ula_prefix(prefix_length))
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