UPS has been down now since around 3:30 PM EST. Apparently it has been hit by Turkish hackers. It is one of multiple site that apparently have been hit.
It is not the sites themselves that have been hit but their Domain Name Registry NetNames which tells everyone where the site is located.
Apparently the hackers declared 4 September “World Hackers Day”. Ironic it occurred on Labor Day Weekend here in the US – a time celebrating “honest toil”.
Read more at http://www.zdnet.com/blog/btl/dns-hack-hits-200-major-websites-vodafone-ups-acer-microsoft-sites-affected/57294