[CentOS] mirror.centos.org down?

I'm getting a server failure for mirror.centos.org.  Is anyone else 
having trouble?

Nameserver trace for mirror.centos.org:

    * Looking for who is responsible for root zone and followed 
g.root-servers.net.
    * Looking for who is responsible for org and followed 
d0.org.afilias-nst.org.
    * Looking for who is responsible for centos.org and followed 
ns3.centos.org.
    * Looking for who is responsible for mirror.centos.org and followed 
pdns1.centos.org.

Nameservers for mirror.centos.org:

    * pdns1.centos.org returned (SERVFAIL)
    * pdns2.centos.org returned (SERVFAIL)
    * pdns3.centos.org returned (SERVFAIL)
    * pdns4.centos.org returned (SERVFAIL)