%% You should probably cite rfc9371 instead of this I-D.
@techreport{pti-pen-registration-01,
    number =    {draft-pti-pen-registration-01},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-pti-pen-registration/01/},
    author =    {Michelle Cotton and Amanda Baber and Paul E. Hoffman},
    title =     {{Registration Procedures for Private Enterprise Numbers (PENs)}},
    pagetotal = 6,
    year =      2018,
    month =     apr,
    day =       3,
    abstract =  {This document describes how Private Enterprise Numbers (PENs) are registered by IANA. It shows how to request a new PEN and how to request an update to a current PEN. It also gives a brief overview of PEN uses.},
}