Jose-Marcio Martins da Cruz wrote:
A and TXT records were the way found, years ago, to implement DNSBL
without creating new kind of DNS records.
In fact, as long as I understand, the A record is useful to return a
machine handleable code allowing to specify, why the record is listed.
The TXT record contains human readable information.
Right: MOST DNSBLs return A records to bitmap/flag listings.
However, there are a few DNSBLs that return machine-readable in the TXT.
Eg: routeviews.
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