e-CFR
"The Electronic Code of Federal Regulations (e-CFR) is a currently updated version of the Code of Federal Regulations (CFR). It is not an official legal edition of the CFR."
The e-CFR is an editorial compilation of CFR material and Federal Register amendments produced by the U.S. National Archives and Records Administration's Office of the Federal Register (OFR) and the Government Publishing Office. The material in the e-CFR is updated on a daily basis, although not in real-time. You can find how current the material is at the top of all e-CFR web pages. Generally, the e-CFR is current within two business days. While every effort is made to ensure that the material on the eCFR is accurate, those relying on it for legal research should verify their results against the most current official edition of the C.F.R.