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README: declare base_reverse_dns_map.csv under CC BY-SA 4.0

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The map is now a curated derivative of the bundled IPinfo Lite MMDB
(as_domain / as_name fields, walked for unmapped operators and
classified via the workflow in AGENTS.md). IPinfo Lite is licensed
under Creative Commons Attribution-ShareAlike 4.0, which propagates
to derivative works, so the CSV is distributed under CC BY-SA 4.0
with attribution to IPinfo for the underlying network identification
data.

Also updates the file-size estimate in the README from "over 1,400"
to "over 5,000" to reflect the current state.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
Sean Whalen
2026-04-26 16:00:39 -04:00
parent 851560a9b1
commit f6deeb4b25
1 changed files with 13 additions and 1 deletions
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parsedmarc/resources/maps/README.md
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@@ -71,7 +71,19 @@ The `service_type` is based on the following rule precedence:
- Utilities
- Web Host
The file currently contains over 1,400 mappings from a wide variety of email sending sources.
The file currently contains over 5,000 mappings from a wide variety of email sending sources.
### License
`base_reverse_dns_map.csv` is a curated derivative work. Many entries
are derived from the bundled IPinfo Lite MMDB (`as_domain` and
`as_name` fields) by walking the database for unmapped operators and
classifying them via the workflow described in [AGENTS.md](../../../AGENTS.md).
Because IPinfo Lite is licensed under
[Creative Commons Attribution-ShareAlike 4.0 (CC BY-SA 4.0)](https://creativecommons.org/licenses/by-sa/4.0/),
this CSV is also distributed under **CC BY-SA 4.0** with attribution to
[IPinfo](https://ipinfo.io/) for the underlying network identification
data.
## known_unknown_base_reverse_dns.txt