It is now part of NCES DataLab (https://nces.ed.gov/datalab/). To access the Online Codebook, visit the DataLab homepage and click on the Online Codebook link on the left-hand navigation menu (see image below). Existing Codebook user logins, sessions, and syntax files are available in DataLab. Please contact the NCES help desk (email@example.com) if you have any questions.
Online Codebook Support Staff