Password hacking is complicated stage in hacking cycle since it is not only the step which allows you access in victim’s PC but it marks origin of real hacking. But before trying anything else an attacker will always try to exploit victim using default password of device used by victim. A unchanged default password is always held as misconfiguration as per hacking is concerned. An attacker at very first stage may try to crack BIOS passwords,router passwords, switch passwords, dial-up passwords, modem passwords and passwords of other networking and communication devices by using their default password. There are several sites available which store huge database of default passwords. Following list shows some of them the list of password they store are more than sufficient, if you have this list you can breach any device with default password.
So far as I know http://www.defaultpassword.com/ is biggest database of default passwords available online. You can browse through list of thousands of manufactures and their product. You can also search for specific manufacturer and its device and can also contribute list for newer default passwords.
It is second biggest and much accurately sorted default password database as per my view is concerned. It has listed all vendors in their alphabetical order. When you click on vendors name it shows you device name, its default password and few word description about how to use it for attack.
Whenever you want to find out default password I will recommended try this site first. You can easily search for passwords using their navigation. Searching for password in their database is so easy you will hardly need any effort to search, since you can search by vendor name, product name and even by model number. Their database includes default password for equipments and software from many vendors including 3Com, Cisco, Nortel, IBM, HP, Compaq, Digital, D-link, Linksys, Oracle, Microsoft and many more.
It is special database to search passwords for routers, select router manufacturer and press find password it will list all models along with their numbers, user-names and password.
Some other sites that store default password.