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External Data Source

Source

Regular Expression
^(((0|128|192|224|240|248|252|254).0.0.0)|(255.(0|128|192|224|240|248|252|254).0.0)|(255.255.(0|128|192|224|240|248|252|254).0)|(255.255.255.(0|128|192|224|240|248|252|254)))$