To cite package ‘ip2proxy’ in publications use:

  Ooi K (2023). _ip2proxy: Lookup for IP Address Proxy Information_. R
  package version 1.2.0, <https://CRAN.R-project.org/package=ip2proxy>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {ip2proxy: Lookup for IP Address Proxy Information},
    author = {Kai Wen Ooi},
    year = {2023},
    note = {R package version 1.2.0},
    url = {https://CRAN.R-project.org/package=ip2proxy},
  }