US CODE: Title 15, Chapter 1, Section 2.
1) So-called "anti-trust" laws are immoral, and are just another way to
put the screws to business, already America's most popular scapegoat.
Immoral or not, it is the law.
2) IP addresses are not a "national resource". There is no such thing as
a "national resource". IP addresses are not 'scarce', either. Their
limitation of number is purely a technical limitation, and one that
can be (and is being) addressed by engineers (such as IPv6). (I'll
note that the exact same is the case of radio frequencies - their
'scarcity' is a technical limitation, as new technologies make it
possible to put more and more communications in smaller bands).
The issue of "IP addresses as a national resource" is open for debate
on many levels, not the least of which is your analogy to very-much-regulated
radio frequencies.