The Master List is digitally signed using an ICAO Master List Signer Certificate that is itself signed by the United Nations CSCA, both of which are included in the Master List in accordance with ICAO Doc9303. ICAO can provide the UN CSCA public key certificate to States upon request.
Master List Contents
Inclusion of certificates in the Master List is based on the ICAO Master List policy and procedure, available here.
The Master List currently contains 394 certificates from ICAO PKD participants. This version was issued in September 2023.
The ICAO Master List is available for download at the bottom of this page, subject to the terms and conditions outlined herein. It is also part of the ICAO PKD, available for download by ICAO PKD participants. The contents of the PKD can also be downloaded, subject to terms and conditions,
Conditions for use of the ICAO Master List
Any receiving state or entity making use of the Master List must determine its own policies for establishing trust in the certificates contained on the list.
The Master List may contain certificates that are not conformant with existing technical standards for such certificates. No responsibility is assumed for issues that may arise due to such non-conformance.
The ICAO Master List will be updated at 3-monthly intervals as appropriate. If you wish to be notified of new Master Lists being made available, please subscribe to our notification e-mail list by providing your email address to
2. The ICAO Health Master List
The Master List is digitally signed using an ICAO signing certificate established for this purpose. The ICAO CA public key certificate and its associated Certificate Revocation List can be downloaded here.
Inclusion of certificates on the list is based on the Health Master List policy, published here. Any receiving state or entity making use of the Master List must determine its own policies for establishing trust in the certificates contained on the list. The Master List contains certificates that are not conformant with existing ICAO technical standards for such certificates. No responsibility is assumed for issues that may arise due to such non-conformance.
The Health Master List will be updated regularly, as soon as new certificates are made available to ICAO.
Working with the ICAO Master Lists
The ML Explorer software can be used to read the contents of the ICAO Master Lists and to extract certificates from them. ICAO makes the software available for download and installation thanks to a generous donation from the Kingdom of the Netherlands who have developed this software and offer it to the international community for use.
Download ML Explorer
Download the ICAO Master List and/or ICAO Health Master List
Download of the ICAO Master List and ICAO Health Master List is subject to the following terms and conditions. Please indicate your agreement in order to proceed with the download(s).
Terms & Conditions
The ICAO Master List and Health Master List download (the "Service") is an online information service provided by ICAO, subject to your compliance with the Terms and Conditions set forth below.
Please read the Terms and Conditions carefully before accessing or using the Service. By accessing or using the Service, you agree to be bound by the Terms and Conditions set forth below. If you do not wish to be bound by these Terms and Conditions, you may not access or use the Service. If you utilize the Service in a manner inconsistent with these Terms and Conditions, ICAO may terminate your access, block your future access and/or seek such additional relief as the circumstances of your misuse indicate is proper. ICAO may modify the Terms and Conditions at any time, and such modifications shall be effective immediately upon posting of the modified Terms and Conditions. You agree to review the Terms and Conditions periodically to be aware of such modifications and your continued access or use of the Service shall be deemed your conclusive acceptance of the modified Terms and Conditions.