Generated address showing as invalid on any bitcoin Block Explorer

I used this lib to generate bitcoin private key and corresponding bitcoin address:

use lib "./lib";
use Bitcoin;
my $private_key = random Bitcoin::Key;
my $address = $private_key->address;

but when I try to query it on any Bitcoin block explorer, I got info that my address is invalid.

For example,
generated private key: 92Fk6Zk2VEjE32swoWrVvJdV39VqHaBWR3tSYMyZxsjwYwRwSda
corresponding address: mzitbXSyuN5hYMdRr9tZP9F97riBVq1y6r

BlockChain (https://blockchain.info/address/mzitbXSyuN5hYMdRr9tZP9F97riBVq1y6r) throws error: "Unrecognized Address Version 111".

(I am using perl version 5.18)

[jes]

That's a testnet address. You need to set the environment variable BITCOIN_TEST=no to generate mainnet addresses.