On 9/10/2024 7:59 AM, Faisal Misle via mailop wrote:
Hello all,
I've got a question about an IPv6 address on an SPF record.
The host in question is: `spf.savea.se` which has the following
mechanism "ip6:0:0:0:0:0:ffff:5b6a:c61d"
A couple of SPF validators throw different sets of warnings:
- The address 0:0:0:0:0:ffff:5b6a:c61d is not a valid IPv6 address.
Please correct the address and try again.
- (WARNING: non-routable IP-address: IPv4-mapped addresses).
I've tried researching but haven't been able to find a good example to
pass along to the powers that be on why that mechanism should not be
in that SPF record. Any pointers or links to relevant tech docs would
be appreciated!
Faisal Misle
Sr. Technical Lead, Customer Success & Strategic Projects | Red Sift
That's an IPv4-mapped-IPv6 address that's not routable on the internet,
I'm not sure why it would have been added to their external SPF record.
They're not allowed to be used as sources or destinations, nor are they
globally reachable.
See here: IANA IPv6 Special-Purpose Address Registry
<https://www.iana.org/assignments/iana-ipv6-special-registry/iana-ipv6-special-registry.xhtml>for
::ffff:0:0/96
- Mark Alley
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