%% You should probably cite rfc7151 instead of this I-D.
@techreport{hethmon-mcmurray-ftpext-ftp-hosts-04,
    number =    {draft-hethmon-mcmurray-ftpext-ftp-hosts-04},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-hethmon-mcmurray-ftpext-ftp-hosts/04/},
    author =    {Paul Hethmon and Robert McMurray},
    title =     {{File Transfer Protocol HOST Command for Virtual Hosts}},
    pagetotal = 23,
    year =      2013,
    month =     nov,
    day =       4,
    abstract =  {The File Transfer Protocol, as defined in RFC 959, does not provide a way for FTP clients and servers to differentiate between multiple DNS names that are registered for a single IP address. This document defines a new FTP command that provides a mechanism for FTP clients and servers to identify individual virtual hosts on an FTP server.},
}