To cite package ‘ip2locationio’ in publications use:

  IP2Location.io (2024). _ip2locationio: Lookup Geolocation and Proxy
  Information using 'IP2Location.io' API_. R package version 1.0.0,
  <https://CRAN.R-project.org/package=ip2locationio>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {ip2locationio: Lookup Geolocation and Proxy Information using 'IP2Location.io'
API},
    author = {{IP2Location.io}},
    year = {2024},
    note = {R package version 1.0.0},
    url = {https://CRAN.R-project.org/package=ip2locationio},
  }