How did you get your result? If you have received the TRF ( The certificate ) then the TRF number will be there. If you have got the result just by sms or online I suggest to wait till the TRF reaches you. You may search in this forum to derive TRF number even before you got that in hand.
Assuming it is IDP, in your result preview, check bottom left-hand corner. If the space is blank, then check the https://www.ieltsessentials.com/global/results preview. You'll surely have it there.
Strict quality control procedures are in place to protect the integrity and security of the IELTS test. As part of these procedures, test results are routinely analysed by the IELTS Test Partners before they are issued to candidates.
As a result of these procedures, test scores for the 20 January 2018 have come under scrutiny and are being investigated. Your results are being withheld while this investigation is being conducted. Please note that all investigations are conducted without prejudice by the IELTS Test Partners.
The declaration on the IELTS application form that you agreed to includes the following statement: 'I understand that my results may not be issued 13 days after the test if any of the IELTS Test Partners deem it necessary to review any matter associated with my test'.
We will provide an update on your results on or before 09 February 2018.