Depending on how well your DNS servers are setup.

And much depends on how well those servers are maintained, monitored and kicked.

*MOST* ISPs are very lackadaisical (carefree) in the approach to any kind of DNS server.

If you must use *ONE* of the four machines I have (preferably 66.80.246.[ 66 | 91 ])

But only until you ISP wakes from its slumber.