NCAA Championships over the last 20 years by major basketball conference with conferences as presently constituted:

ACC-9 National Championships in the past 20 years
2001 Duke
2003 Syracuse
2005 North Carolina
2009 North Carolina
2010 Duke
2013 Louisville
2015 Duke
2017 North Carolina
2019 Virginia

Big East-5 National Championships in the past 20 years
2004 UConn
2011 UConn
2014 UConn
2016 Villanova
2018 Villanova

SEC-3 National Championships in the past 20 years
2006 Florida
2007 Florida
2012 Kentucky

Big 12-2 National Championships in the past 20 years
2008 Kansas
2021 Baylor

Big 10-1 National Championship in the past 20 years
2002 Maryland

Pac 12-Zero National Championships in the past 20 years