On 2022-03-19 at 00:27:21 UTC-0400 (Fri, 18 Mar 2022 23:27:21 -0500)
Keith Kouzmanoff via mailop <ke...@kouzmanoff.com>
is rumored to have said:
I am sure it's going to depend on what function or library the MTA is
using to check but is it safe to assume an SPF record with a CIDR
range includes all ips in that range, useable or not.
Yes.
CIDR notation can describe a network, which has a network address and a
broadcast address that don't refer to specific devices but it can also
simply describe a range of IP addresses with bit-aligned endpoints,
regardless of how they happen to be used in a network.
One way you can get confusion in what a CIDR-notated range actually
means is the "bit-aligned" element. 192.168.1.120/29 is
192.168.1.120-192.168.1.127 inclusive, but so is 192.168.1.124/29. The
/29 is a bitmask, not simply a length indicator.
--
Bill Cole
b...@scconsult.com or billc...@apache.org
(AKA @grumpybozo and many *@billmail.scconsult.com addresses)
Not Currently Available For Hire
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