At blockchain.info one of the things you can search for is the firstbits of a BTC address.
I guess the address needs to be registered first at firstbits.com before it will appear in the results at blockchain.info.
(Is this assumption correct?)
I can't do that because for the past 3 days (probably longer) firstbits.com has been down.
I do understand each firstbits address needs to have at least one transaction first, which the ones I'm trying to register their firstbits, do have.
They are a couple of Casascius physical bitcoins which on the outside only have the first 8 digits of the public address printed. So if I were to sell these coins I'd have to also provide the full public addresses so the buyer can look it up on blockchain to be sure the coins are funded. Or find out how to submit firstbits.
Edit: Even though blockchain.info doesn't find the firstbits (first 8 characters), blockexplorer.com does find it. Still wondering how to add it to blockchain.info; maybe they are discontinuing firstbits?