| Type | Description | Reference |
|---|
| 0 | Reserved | RFC 3748 |
| 1 | Identify | RFC 3748 |
| 2 | Notification | RFC 3748 |
| 3 | NAK (Response Only) | RFC 3748 |
| 4 | MD5-Challenge | RFC 3748 |
| 5 | OTP, One Time Password | RFC 2289RFC 3748 |
| 6 | GTC, Generic Token Card | RFC 3748 |
| 7 | Allocated | |
| 8 | Allocated | |
| 9 | RSA Public Key Authentication | RFC-draft-ietf-pppext-eaprsa-04.txt |
| 10 | RSA Public Key Authentication | RFC-draft-ietf-pppext-eapdss-01.txt NIST FIPS PUB 196 |
| 11 | KEA | RFC-draft-ietf-pppext-eapkea-01.txt |
| 12 | KEA-VALIDATE | RFC-draft-ietf-pppext-eapkea-01.txt |
| 13 | EAP-TLS Authentication Protocol | RFC 5216 |
| 14 | Quest Defender Token | |
| 15 | RSA Security SecurID EAP | RFC-draft-josefsson-eap-securid-01.txt |
| 16 | Arcot System EAP | |
| 17 | Cisco-LEAP | |
| 18 | EAP-SIM, GSM Subscriber Identity Modules | RFC 4186 |
| 19 | SRP-SHA-1 Part 1 | RFC-draft-ietf-pppext-eap-srp-03.txt |
| 20 | SRP-SHA-1 Part 2 | RFC-draft-ietf-pppext-eap-srp-01.txt |
| 21 | EAP-TTLS, EAP Tunneled TLS Authentication Protocol | RFC 5281 |
| 22 | Remote Access Service | |
| 23 | EAP-AKA, EAP method for 3rd Generation Authentication and Key Agreement | RFC 4187 |
| 24 | EAP-3Com Wireless | |
| 25 | PEAP, Protected EAP | RFC-draft-josefsson-pppext-eap-tls-eap-06.txt |
| 26 | MS-EAP-Authentication (EAP/MS-CHAPv2) | RFC-draft-kamath-pppext-eap-mschapv2-02.txt |
| 27 | EAP-MAKE, Mutual Authentication w/Key Exchange | RFC-draft-berrendo-chabanne-pppext-eapmake-01.txt |
| 28 | CRYPTOCard | |
| 29 | PEAPv0/EAP-MSCHAPv2 | RFC-draft-dpotter-pppext-eap-mschap-01.txt |
| 30 | DynamID | |
| 31 | Rob EAP | |
| 32 | EAP-POTP, Protected One Time Password | RFC 4793 |
| 33 | MS-Authentication-TLV | RFC-draft-hiller-eap-tlv-01.txt |
| 34 | SentriNET | |
| 35 | EAP-Actiontec Wireless | |
| 36 | Cogent Systems Biometrics Authentication EAP | |
| 37 | AirFortress EAP | |
| 38 | EAP-HTTP Digest | |
| 39 | SecureSuite EAP | |
| 40 | DeviceConnect EAP | |
| 41 | EAP-SPEKE | |
| 42 | EAP-MOBAC | |
| 43 | EAP-FAST, EAP Flexible Authentication via Secure Tunneling | RFC 4851RFC 5421RFC 5422 |
| 44 | ZLXEAP, ZoneLabs EAP | |
| 45 | EAP-Link | |
| 46 | EAP-PAX, EAP Password Authentication eXchange | RFC 4746 |
| 47 | EAP-PSK, EAP Pre-Shared Authentication and Key Establishment | RFC 4764 |
| 48 | EAP-SAKE, EAP Shared-secret Authentication and Key Establishment | RFC 4763 |
| 49 | EAP-IKEv2 | RFC 5106 |
| 50 | EAP-AKA, Improved EAP method for 3rd Generation Authentication and Key Agreement | RFC-draft-arkko-eap-aka-kdf-10.txt |
| 51 | EAP-GPSK, EAP Generalized Pre-Shared Key | RFC 5433 |
| 52-191 | Available via review by designated expert | RFC 3748 |
| 192-253 | Reserved for allocation via standards action | RFC 3748 |
| 254 | Expanded Type | RFC 3748 |
| 255 | Experimental | RFC 3748 |
