Surfboard cable modem
Motorola Surfboard cable modems (at least the SB4200, and apparently several other models) have a built-in web-based configuration utility, which can be accessed by browsing to http://192.168.100.1/. There is no username or password required.
The SB4200 also has a built-in DHCP ability.
...and here I went out and bought a cable router. Well, if the cable router ever goes out, I'll see what the modem can do. --Woozle 15:20, 5 November 2005 (EST)