Since the NFL changed to the 6 team playoff format, what is the best and worst record for each rank 1-6?

From 1990 to 2019, the NFL playoffs included 6 teams from each conference. Note that in 2020 the league expanded playoffs teams from 6 to 7 in each conference, so this answer doesn't include any teams from the 2020-21 season onwards.

Here are the list of best regular season records for each team:

• #1 Seed record: 16-0 by
  • 2007 New England Patriots 16-0
• #2 Seed record: 14-2 by
  • 1998 Atlanta Falcons
  • 2004 New England Patriots
• #3 Seed record: 13-3 by
  • 2011 New Orleans Saints
  • 2019 New Orleans Saints
• #4 Seed record: 13-3 by
  • 1999 Tennessee Titans
• #5 Seed record: 12-4 by
  • 2001 San Francisco 49ers
  • 2003 Tennessee Titans
  • 2005 Jacksonville Jaguars
  • 2008 Indianapolis Colts
  • 2010 Baltimore Ravens
  • 2011 Pittsburgh Steelers
  • 2013 San Francisco 49ers
  • 2016 Oakland Raiders
  • 2018 Los Angeles Chargers
• #6 Seed record: 11-5 by
  • 2005 Pittsburgh Steelers
  • 2008 Baltimore Ravens
  • 2009 Philadelphia Eagles
  • 2010 New York Jets
  • 2013 New Orleans Saints
  • 2014 Detroit Lions

Worst regular season records:

• #1 Seed record: 11-5 by
  • 1992 Pittsburgh Steelers
  • 2002 Oakland Raiders
• #2 Seed record: 10-6 by
  • 1993 San Francisco 49ers
  • 2006 New Orleans Saints
• #3 Seed record: 9-7 by
  • 1990 Cincinnati Bengals
  • 1999 Seattle Seahawks
• #4 Seed record: 7-9 by
  • 2010 Seattle Seahawks
• #5 Seed record: 8-8 by
  • 1999 Dallas Cowboys
  • 2004 St. Louis Rams
• #6 Seed record: 8-8 by
  • 1990 New Orleans Saints
  • 1991 New York Jets
  • 1999 Detroit Lions
  • 2004 Minnesota Vikings
  • 2006 New York Giants

In terms of playoffs, the best appearance for each seed is a Super Bowl:

• #1 Seed: Super Bowl Champions, ex 2015-16 Denver Broncos
• #2 Seed: Super Bowl Champions, ex 2018-19 New England Patriots
• #3 Seed: Super Bowl Champions, ex 2006-07 Indianapolis Colts
• #4 Seed: Super Bowl Champions, ex 2012-13 Baltimore Ravens
• #5 Seed: Super Bowl Champions, ex 2007-08 New York Giants
• #6 Seed: Super Bowl Champions, ex 2010-11 Green Bay Packers

And when it comes to worst playoffs performances, all seeds have lost on the first round of their games.