In practice,let us consider the name
foo.sol . If we want to find the domain's
A record, containing an associated IPv4 address, then we can find it by querying
\0 the null character. The specification makes use of the null character prefix in order to differentiate between actual domains and records, which means that it is still possible to use the
A.foo.sol with no collision.
In addition to this, the special
\0.foo.sol is reserved to hold the list of all currently initialized records for a given subdomain.