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question about net address



Hello

I know 192.168.1.0/24 is a valid C range for network address.

but what does 192.168.1.1/24 mean?

I ask this just for a setting in the SPF:

spf.pinoad.se.		300	IN	TXT	"v=spf1 ip4:188.66.63.1/24 -all"


Thanks.


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