Torxed

def cidr_to_netmask(cidr :int, bitlen=32) -> str:
	netmask = ''
	while cidr > 8:
		netmask += '255.'
		cidr -= 8
	netmask += str(2 ** cidr - 1) # math.log(128, 2)

	return netmask + ('.0' * (3 - netmask.count('.') if bitlen == 32 else 7 - netmask.count('.')))

Torxed

All tests were performed in a docker container, using the image postgres:15.4. All tests used the same test data, but with scrambled hash values.

Only deviation from postgresql default startup parameters were:

-c work_mem=2048MB
-c maintenance_work_mem=2048MB
-c max_wal_size=8GB