[gilbetron]

Formally it should be 10.0.0.0/8, but you'll often encounter CIDRs written less formally by including set bits outside of the cidr prefix length. Often it is shorthand for "the subnet that includes this IP address", so 192.254.33.12/16, for instance. Or it might be a typo! ;)

[unilynx]

I would interpret 192.254.33.12/16 to mean 'host 192.254.33.12 in a /16 subnet'.

That's also the notation `ip` on Linux supports