Show What an IP Address Literal Means Under Every Standard R package raddr version 0.1.2 Standards and implementations disagree about what an IP address literal means: the string "0177.0.0.1" is rejected by the dotted-quad grammar, read as 127.0.0.1 by browsers, and read as 177.0.0.1 by some 'inet_pton' implementations. Most libraries pick one reading and discard the rest. This package reports them all, alongside the reason codes that explain each one, and classifies parsed values against the IANA special-purpose address registries. It is pure R, performs no network access, and returns facts rather than allow or deny verdicts. Software Depends: R (>= 4.0.0) Imports: rlang (>= 1.1.7), vctrs (>= 0.7.0) Suggests: bignum, bit64, digest, hedgehog, knitr, rmarkdown, spelling, testthat (>= 3.0.0) Bart Turczynski <bartek@turczynski.pl> Comprehensive R Archive Network (CRAN) Bart Turczynski [aut, cre] (ORCID: <https://orcid.org/0000-0002-8788-7980>), web-platform-tests contributors [cph] (bundled URL test corpus, BSD-3-Clause; see inst/COPYRIGHTS) MIT + file LICENSE (https://CRAN.R-project.org/package=raddr/LICENSE) 2026-09-21 application/tgz https://CRAN.R-project.org/package=raddr doi:10.32614/CRAN.package.raddr en-US