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github.com/da-rod/rdns@latest\n```\n\n# Usage\n\nTakes an IP address or range as argument:\n\n```bash\n$ rdns 140.82.118.0/28\n140.82.118.0 []\n140.82.118.1 [lb-140-82-118-1-ams.github.com.]\n140.82.118.2 [lb-140-82-118-2-ams.github.com.]\n140.82.118.3 [lb-140-82-118-3-ams.github.com.]\n140.82.118.4 [lb-140-82-118-4-ams.github.com.]\n140.82.118.5 [lb-140-82-118-5-ams.github.com.]\n140.82.118.6 [lb-140-82-118-6-ams.github.com.]\n140.82.118.7 [lb-140-82-118-7-ams.github.com.]\n140.82.118.8 [lb-140-82-118-8-ams.github.com.]\n140.82.118.9 [lb-140-82-118-9-ams.github.com.]\n140.82.118.10 [lb-140-82-118-10-ams.github.com.]\n140.82.118.11 [lb-140-82-118-11-ams.github.com.]\n140.82.118.12 [lb-140-82-118-12-ams.github.com.]\n140.82.118.13 [lb-140-82-118-13-ams.github.com.]\n140.82.118.14 [lb-140-82-118-14-ams.github.com.]\n140.82.118.15 []\n```\n\nReads data from stdin:\n\n```bash\n$ cat /tmp/ips.txt | rdns -\n216.58.204.0 [lhr35s07-in-f0.1e100.net.]\n216.58.204.1 [lhr35s07-in-f1.1e100.net.]\n216.58.204.2 [lhr35s07-in-f2.1e100.net.]\n216.58.204.3 [lhr48s21-in-f3.1e100.net.]\n[...]\n```\n\nNotes:\n\n* Filters input which is not (valid, duh) **strict** IP or IP range\n* When working from stdin, it filters out empty and commented lines (redundant, I know...)\n* Accepts \"short\" IP ranges like `x.y.z` and treats it as `x.y.z.0/24`\n\n# (Known) Alternative\n\n* http://www.spamshield.org/fast-rdns.pl\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fda-rod%2Frdns","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fda-rod%2Frdns","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fda-rod%2Frdns/lists"}