IPExtensions.swift

import Foundation

extension UInt32 {
    public func IPv4String() -> String {
        let byte1 = UInt8(self & 0xff)
        let byte2 = UInt8((self >> 8) & 0xff)
        let byte3 = UInt8((self >> 16) & 0xff)
        let byte4 = UInt8((self >> 24) & 0xff)
        
        return "\(byte1).\(byte2).\(byte3).\(byte4)"
    }
}

extension String {
    public func IPv4Int() -> UInt32 {
        var addr = in_addr()
        let retval = inet_pton(AF_INET, self, &addr)
        if retval == 1 { return addr.s_addr }
        return 0
    }
}

let address = "192.168.0.1"
address.IPv4Int().IPv4String()