Seems like there is an issue with Level3's DNS if any of you use it. (220.127.116.11, 18.104.22.168, 22.214.171.124). Noticed it about an hour or so ago, both MSNBC.com and ESPN.com wouldn't come up. Switched to Google DNS (126.96.36.199, 188.8.131.52) and they popped right up. If anyone is using L3's DNS' you may see issues with some websites loading.
I'm seeing the issue with both Firefox and Chrome so it's not browser specific.
I personally believe either L3 DNS or Google DNS are more reliable. It's really a matter of personal opinion. I moved to L3 DNS when Mediacom put in their own DNS servers and had some problems the first week or so and just have never gone back.
If you aren't having any issues with Mediacom's DNS that's good. Just be aware their are others out there it trouble strikes.