Validators create a new keypair for each round of validation, and use that to participate in elections and create blocks. They may also change their ADNL address on each round, but that's not what they usually do.

If you want to look at their wallets on TON blockchain explorers, you have to first find the controlling wallet, that is the wallet that sends TON to participate in elections.

This information can be looked up by running the get method participant_list_extended and it only returns useful data before election is finished.

For example, if I start lite-client on testnet and run this command:

runmethod kf8zMzMzMzMzMzMzMzMzMzMzMzMzMzMzMzMzMzMzMzMzM_BP participant_list_extended

The result will be something like:

result:  [ 1692631422 1692631242 10000000000000 14019250477034344 ([1785726394745260293869629821187026920743160317479397166793665319642004602034 [1000001000000000 1966080 101184175721668699951755525112601793644527200681998252172335557711320252984635 87647878168491834245916094424296400596840187149190938906730361646994336065092]] [...

Here, the first 4 fields are related to election (elect_at, elect_close, min_stake, total_stake), then there is a list of validators, first field being the validator id, and then 4 related fields, the third one being the address of controlling wallet.

For example, here, 1785726394745260293869629821187026920743160317479397166793665319642004602034 is the validator id or validator_pubkey, and 101184175721668699951755525112601793644527200681998252172335557711320252984635 is the decimal number which can identify the wallet. If you convert it to a hex value, and then convert it to a TON address (ton.org/address and prepending with '-1:') then you'll arrive at address: kf_ftDbFY_gRWt2FkqVk68scKhuoniW6Po7GndTGdkCtO_2Z.