sites/utilities that measure uptime
 

does anyone know of a resource that might give me the instant uptime stats on a domain?

not sure if there is anything like that out there; not looking for a service that i have to enter the domain in and thats when it begins tracking the uptime from that point on, but that i can just enter a domain and get the history instantly

any help or assistance would be appreciated

nmap can do uptime calculations remotely, however some operating systems are patched. but this was in the announcement.

<I> Nmap can now detect the uptime of many hosts when the OS Scan option (-O) is used.</I>