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not a valid IPv4 address.

CIDR cheat sheet

/23 = 255.255.254.0

/24 = 255.255.255.0

/25 = 255.255.255.128

/26 = 255.255.255.192

/27 = 255.255.255.224

/28 = 255.255.255.240

/29 = 255.255.255.248

/30 = 255.255.255.252

/31 = 255.255.255.254

/32 = 255.255.255.255