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[Valid]
IPv4 = 192.168.128.9
IPv4 = 127.0.0.1
IPv4 = 1.2.3.4
IPv4 = 0.0.0.0
IPv4 = 0.0.0.1
IPv4 = 0.0.1.0
IPv4 = 0.1.0.0
IPv4 = 1.0.0.0
IPv4 = 0.255.255.255
IPv4 = 255.0.255.255
IPv4 = 255.255.0.255
IPv4 = 255.255.255.0
IPv4 = 255.255.255.255
[Invalid]
IPv4 = 1.2.3.4.5
IPv4 = 1.01.1.1
IPv4 = 1.256.1.1
IPv4 = 256.256.256.256
IPv4 = 1.1.1.314149
IPv4 = 1.
IPv4 = 1.2.
IPv4 = 1.2.3.
IPv4 = 1.2.3.4.
IPv4 = 1.2.3.4.5.
IPv4 = 0.
IPv4 = 0.0.
IPv4 = 0.0.0.
IPv4 = 0.0.0.0.
IPv4 = 0.0.0.0.0.
IPv4 = 1
IPv4 = 1.2
IPv4 = 1.2.3
IPv4 = 1.2.3.4.5
IPv4 = .1.2.3.4
IPv4 = 1..2.3.4
IPv4 = 1.2..3.4
IPv4 = 1.2.3..4
IPv4 = 1.2..4
IPv4 = 01.1.1.1
IPv4 = 1.01.1.1
IPv4 = 1.1.01.1
IPv4 = 1.1.1.01
IPv4 = ff.0.1.2
IPv4 = a.b.c.d
# These are 'valid' but not 4 dotted decimals -> rejected
IPv4 = 010.010.010.010
IPv4 = 010.8.0x8.8
IPv4 = 134744072
IPv4 = 127.1