Looks like a routing issue to their DNS servers from here.
traceroute to DNS020.C.REGISTER.COM (216.21.235.20), 64 hops max, 40 byte
packets
1 c28.134.nauticom.net (209.195.134.28) 0.778 ms 0.894 ms 0.829 ms
2 10.11.11.9 (10.11.11.9) 1.010 ms 0.799 ms 0.829 ms
3 c246.134.nauticom.net (209.195.134.246) 1.271 ms 1.379 ms 1.350 ms
4 207.88.183.141.ptr.us.xo.net (207.88.183.141) 84.817 ms 7.764 ms
7.699 ms
5 65.106.3.185.ptr.us.xo.net (65.106.3.185) 7.606 ms 7.634 ms 7.504 ms
6 206.111.0.54.ptr.us.xo.net (206.111.0.54) 31.458 ms 28.509 ms 20.199
ms
7 Vlan424.icore1.MLN-Miami.as6453.net (66.110.9.13) 48.740 ms 36.118 ms
36.211 ms
8 ix-6-2.icore1.MLN-Miami.as6453.net (66.110.9.54) 36.328 ms 36.851 ms
36.334 ms
9 * * *
10 blackhole.prolexic.com (209.200.132.42) 36.127 ms 36.136 ms 36.298 ms
11 *
Clinton Popovich
Systems Engineer
Consolidated Communications
