Why the special treatment of "high ports"

I've run a few tests with my router/firewall, and found out the following:

-if I perform a port-scan, the highest port reported as blocked in firewall's log will be 59316;

-if I perform a port-scan using grc.com Shields Up, the ports from 59317 on will be reported "stealth", but only because the software firewall on the computer blocks them (even so, the software firewall's log won't show the consecutive order of blocked ports, but a rather weird sequence) -- otherwise they would appear closed;

-ports 65460-65535 are reported as just "closed", not stealthed, despite the additional software firewall (which won't show anything in this case, so it seems like they're used for something).

What is so special about these ports that they're not treated as those below 59316?

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scorpius
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