Parses a single row of arp data.
function parseOne (data) {
  if (!data || !data[0]) {
    return
  }

  if (process.platform.includes('linux')) {
    // ignore unresolved hosts (can happen when parseOne returns only one unresolved host)
    if (data[0].indexOf('no entry') >= 0) {
      return
    }

    // remove first row (containing "headlines")
    var rows = data[0].split('\n').slice(1)[0]
    return parseLinux(rows, servers, true)
  } else if (process.platform.includes('win32')) {
    return // currently not supported
  }

  return parseRow(data[0], servers)
}