How to close completely UDP?

Question

System administration

Hello.
Please give a command to IPTables to close all UDP ports.

Answer 1

-A INPUT -p udp -m udp --dport 0:65535 -j DROP
In theory, it should be easy to google.

Answer 2

If we discard the fact that DNS works on UDP, NTP is like this:
iptables -I INPUT -p udp -j DROP

Answer 3

What for? Clog the channel with UDP traffic? Then it won't help.