It depends on what you mean. There is no national registration in the U.S. and most states don't require registration.
You cant'.
Since they are not registered, there is no way to answer your question. In the US, MOST guns are not registered- there is no law requiring that guns be registered. It is a popular misconception that there IS such a requirement, but there is none on a Federal level.
Not unless you are a LEO and have a valid reason to know.
No
No.
Like most of the US, there is no registration of guns in Texas.
No- see link below.
No, but gun owners do.
In most U.S. states, there is no registration.
Many places don't require it.
It depends on the country where you live. Where I live pellet guns don't have to be registered.
The number of guns owned by civilians in the United States is estimated to be between 238 million and 276 million. There is no gun registration on the Federal level, except for machine guns. There is no registration on the state level in the majority of the states for any guns. This means that most of these are not registered.