Strange Yahoo URL in my Stats

has anyone seen the rtjudging2?

[mrrob]

I've been checking stats on my network of sites for years, never have I seen a Yahoo corporate URL like this,

The search engine was:
rtjudging2.yst.corp.yahoo.com

The visit entry page was: http: //rtjudging2.yst.corp.yahoo.com/rt/show_idif_2.cgi?do=main&query=MyKeyword%20%26%20MyKeyword%20MyKeyword&qu_text=MyKeyword%20%26%20MyKeyword%20MyKeyword&qu_id=4307&test_id=899185&run_id=1&ju_id=855&qset_id=2890&url=http%3A//www.mydomain.com/&subj_id=3149

Just thought I'd bring it to light, perhaps they are testing a new algorithm on a staging environment, no clue.