%% You should probably cite rfc1219 instead of this I-D.
@techreport{tsuchiya-subnetnos-00,
    number =    {draft-tsuchiya-subnetnos-00},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-tsuchiya-subnetnos/00/},
    author =    {Paul Tsuchiya},
    title =     {{On the assignment of subnet numbers}},
    pagetotal = 13,
    year =      1991,
    month =     jan,
    day =       14,
    abstract =  {This memo suggests a new procedure for assigning subnet numbers. Use of this assignment technique within a network would be a purely local matter, and would not effect other networks. This memo provides information for the Internet community. It does not specify an Internet standard.},
}