To cite package ‘iplookupapi’ in publications use:

Kukacka D (2023). iplookupapi: Client for the 'iplookupapi.com' IP Lookup API. R package version 0.1.0, https://CRAN.R-project.org/package=iplookupapi.

Corresponding BibTeX entry:

  @Manual{,
    title = {iplookupapi: Client for the 'iplookupapi.com' IP Lookup
      API},
    author = {Dominik Kukacka},
    year = {2023},
    note = {R package version 0.1.0},
    url = {https://CRAN.R-project.org/package=iplookupapi},
  }