I have uploaded to my github account two python scripts to parse the list of the Request For Comments (RFCs) and Internet-Drafts (I-Ds) into a bib file, in order to reference easily RFCs and I-Ds using BibTex-compatible software. The output bib files can be generated with two different formats: one recommended format for IEEE magazines and one recommended format according to an already obsolete Internet-Draft draft-carpenter-rfc-citation-recs-01.txt.
The scripts and their usage explanation is detailed in my github account.
However, if you only want recent bib files of RFCs and I-Ds and not the scripts to generate them, you can download updated bib files from http://bipt106.bi.ehu.es/~jtbpizac/ietf2bib. These bib files are generated automatically the 1th and 15th of every month. Even, there is an archive for I-Ds in order to allow the search for obsolete I-Ds.