The FIDO2 specification states that an Authenticator Attestation GUID (AAGUID) must be provided during attestation. An AAGUID is a 128-bit identifier indicating the type of the authenticator. Authenticators with the same capabilities and firmware, such as the YubiKey 5 Series devices without NFC, can share the same AAGUID.
New AAGUIDs will be issued for new YubiKey products which support FIDO2, or when existing YubiKey products have FIDO2 features added or removed.
Product Name or Laser Marking |
Firmware |
FIDO2 AAGUID |
FIDO Certification Level |
FIDO U2F Security Key (Blue) |
All |
N/A |
N/A |
YubiKey 4 (Series) |
All |
N/A |
N/A |
YubiKey FIPS (4 Series) |
4.4 |
N/A |
N/A |
YubiKey 5 (USB-A, No NFC) |
5.1 |
cb69481e-8ff7-4039-93ec-0a2729a154a8 |
Level 1 |
YubiKey 5 (USB-A, No NFC) |
5.2, 5.4 |
ee882879-721c-4913-9775-3dfcce97072a |
Level 1 |
YubiKey 5 NFC |
5.1 |
fa2b99dc-9e39-4257-8f92-4a30d23c4118 |
Level 1 |
YubiKey 5 NFC |
5.2, 5.4 |
2fc0579f-8113-47ea-b116-bb5a8db9202a |
Level 1 |
YubiKey 5 NFC |
5.7 |
a25342c0-3cdc-4414-8e46-f4807fca511c |
Level 1* |
YubiKey 5 NFC CSPN |
5.4 |
2fc0579f-8113-47ea-b116-bb5a8db9202a |
Level 1 |
YubiKey 5 NFC FIPS |
5.4 |
c1f9a0bc-1dd2-404a-b27f-8e29047a43fd |
Level 2 |
YubiKey 5 Nano |
5.1 |
cb69481e-8ff7-4039-93ec-0a2729a154a8 |
Level 1 |
YubiKey 5 Nano |
5.2, 5.4 |
ee882879-721c-4913-9775-3dfcce97072a |
Level 1 |
YubiKey 5 Nano |
5.7 |
19083c3d-8383-4b18-bc03-8f1c9ab2fd1b |
Level 1* |
YubiKey 5 Nano CSPN |
5.4 |
ee882879-721c-4913-9775-3dfcce97072a |
Level 1 |
YubiKey 5 Nano FIPS |
5.4 |
73bb0cd4-e502-49b8-9c6f-b59445bf720b |
Level 2 |
YubiKey 5C |
5.1 |
cb69481e-8ff7-4039-93ec-0a2729a154a8 |
Level 1 |
YubiKey 5C |
5.2, 5.4 |
ee882879-721c-4913-9775-3dfcce97072a |
Level 1 |
YubiKey 5C |
5.7 |
19083c3d-8383-4b18-bc03-8f1c9ab2fd1b |
Level 1* |
YubiKey 5C CSPN |
5.4 |
ee882879-721c-4913-9775-3dfcce97072a |
Level 1 |
YubiKey 5C FIPS |
5.4 |
73bb0cd4-e502-49b8-9c6f-b59445bf720b |
Level 2 |
YubiKey 5C Nano |
5.1 |
cb69481e-8ff7-4039-93ec-0a2729a154a8 |
Level 1 |
YubiKey 5C Nano |
5.2, 5.4 |
ee882879-721c-4913-9775-3dfcce97072a |
Level 1 |
YubiKey 5C Nano |
5.7 |
19083c3d-8383-4b18-bc03-8f1c9ab2fd1b |
Level 1* |
YubiKey 5C Nano CSPN |
5.4 |
ee882879-721c-4913-9775-3dfcce97072a |
Level 1 |
YubiKey 5C Nano FIPS |
5.4 |
73bb0cd4-e502-49b8-9c6f-b59445bf720b |
Level 2 |
YubiKey 5C NFC |
5.2, 5.4 |
2fc0579f-8113-47ea-b116-bb5a8db9202a |
Level 1 |
YubiKey 5C NFC |
5.7 |
a25342c0-3cdc-4414-8e46-f4807fca511c |
Level 1* |
YubiKey 5C NFC CSPN |
5.4 |
2fc0579f-8113-47ea-b116-bb5a8db9202a |
Level 1 |
YubiKey 5C NFC FIPS |
5.4 |
c1f9a0bc-1dd2-404a-b27f-8e29047a43fd |
Level 2 |
YubiKey 5Ci |
5.2, 5.4 |
c5ef55ff-ad9a-4b9f-b580-adebafe026d0 |
Level 1 |
YubiKey 5Ci |
5.7 |
a02167b9-ae71-4ac7-9a07-06432ebb6f1c |
Level 1* |
YubiKey 5Ci CSPN |
5.4 |
c5ef55ff-ad9a-4b9f-b580-adebafe026d0 |
Level 1 |
YubiKey 5Ci FIPS |
5.4 |
85203421-48f9-4355-9bc8-8a53846e5083 |
Level 2 |
Security Key By Yubico (Blue) |
5.1 |
f8a011f3-8c0a-4d15-8006-17111f9edc7d |
Level 1 |
Security Key By Yubico (Blue) |
5.2 |
b92c3f9a-c014-4056-887f-140a2501163b |
Level 1 |
Security Key NFC (Blue) |
5.1 |
6d44ba9b-f6ec-2e49-b930-0c8fe920cb73 |
Level 1 |
Security Key NFC (USB-A, USB-C) (Blue) |
5.2, 5.4 |
149a2021-8ef6-4133-96b8-81f8d5b7f1f5 |
Level 1 |
YubiKey Bio - FIDO Edition |
5.5, 5.6 |
d8522d9f-575b-4866-88a9-ba99fa02f35b |
Level 1 |
YubiKey Bio - FIDO Edition |
5.7 |
dd86a2da-86a0-4cbe-b462-4bd31f57bc6f |
Level 1* |
YubiKey Bio Series - Multi-protocol Edition |
5.6 |
7d1351a6-e097-4852-b8bf-c9ac5c9ce4a3 |
Level 1 |
YubiKey Bio Series - Multi-protocol Edition |
5.7 |
90636e1f-ef82-43bf-bdcf-5255f139d12f |
Level 1* |
Security Key NFC (Black) (USB-A, USB-C) |
5.4 |
a4e9fc6d-4cbe-4758-b8ba-37598bb5bbaa |
Level 2 |
Security Key NFC (Black) (USB-A, USB-C) |
5.7 |
e77e3c64-05e3-428b-8824-0cbeb04b829d |
Level 1* |
Security Key NFC - Enterprise Edition (USB-A, USB-C) (Black) |
5.4 |
0bb43545-fd2c-4185-87dd-feb0b2916ace |
Level 2 |
Security Key NFC - Enterprise Edition (USB-A, USB-C) (Black) |
5.7 |
47ab2fb4-66ac-4184-9ae1-86be814012d5 |
Level 1* |
*FIDO L2 certification is currently in progress
Enterprise Attestation capable devices
FIDO2 devices that are Enterprise Attestation capable are assigned a different AAGUID from devices that are not Enterprise Attestation capable. These devices are known as "enterprise profile."
Product Name or Laser Marking |
Firmware |
FIDO2 AAGUID |
FIDO Certification Level |
YubiKey 5 NFC |
5.7 |
1ac71f64-468d-4fe0-bef1-0e5f2f551f18 |
In progress |
YubiKey 5 Nano |
5.7 |
20ac7a17-c814-4833-93fe-539f0d5e3389 |
In progress |
YubiKey 5C |
5.7 |
20ac7a17-c814-4833-93fe-539f0d5e3389 |
In progress |
YubiKey 5C Nano |
5.7 |
20ac7a17-c814-4833-93fe-539f0d5e3389 |
In progress |
YubiKey 5C NFC |
5.7 |
1ac71f64-468d-4fe0-bef1-0e5f2f551f18 |
In progress |
YubiKey 5Ci |
5.7 |
b90e7dc1-316e-4fee-a25a-56a666a670fe |
In progress |
YubiKey Bio Series - FIDO Edition |
5.7 |
8c39ee86-7f9a-4a95-9ba3-f6b097e5c2ee |
In progress |
YubiKey Bio Series - Multi-protocol Edition |
5.6 |
68167692-ff5a-4ac8-9fd7-0be292a1af68 |
In progress |
YubiKey Bio Series - Multi-protocol Edition |
5.7 |
97e6a830-c952-4740-95fc-7c78dc97ce47 |
In progress |
Security Key NFC - Enterprise Edition (USB-A, USB-C) (Black) |
5.7 |
9ff4cc65-6154-4fff-ba09-9e2af7882ad2 |
In progress |