Re: question about net address

[Jeremy Ardley <jeremy@ardley.org>]

On 19/3/23 18:28, coreyh@free.fr wrote:
> "v=spf1 ip4:188.66.63.1/24 -all" 

According to an AI version 4 that cannot be named:

This is an SPF (Sender Policy Framework) record, which is a TXT record 
in a domain's DNS settings. SPF records are used to help prevent email 
spoofing by specifying which mail servers are authorized to send email 
on behalf of a domain.

In this SPF record:

 * |v=spf1|: This indicates the SPF version used is SPF1.
 * |ip4:188.66.63.1/24|: This specifies that the IPv4 address range
   188.66.63.1 to 188.66.63.254 (a /24 range) is authorized to send
   email on behalf of the domain.
 * |-all|: This means that any host not listed in the SPF record (or
   not within the authorized IP range) is not allowed to send email on
   behalf of the domain.

To answer your question, this SPF record specifies a /24 range 
(188.66.63.1 to 188.66.63.254) rather than a single host. Any mail 
server with an IP address within that range is authorized to send email 
for the domain, while other mail servers are not allowed.


--
Jeremy
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