Audi model codes

Why are some Audi A4’s referred to as B5 or B6? What came before the A6 and when was the Audi 100 produced? These and many other code-specific answers should be in the table below:

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Model name	Years	Code	Alternative
50	1974-1978		86
80	1972-1978	B1	80/82
80	1978-1986	B2	81
80/90	1986-1992	B3	89
80/90 (later A4)	1991-1996	B4	8C
100	1968-1976	C1	F104
100/200/5000	1976-1982	C2	43
100/200/5000	1982-1988	C3	44
100 (later A6)	1990-1994	C4	4A
100 Coupé S	1969-1976
A1	2010-2018		8X
A1	2019-	GB
A2	1999-2005		8Z
A3	1996-2003		8L
A3	2003-2013		8P
A3	2012-		8V
A4 (prev. 80)	1994-2001	B5	8D
A4	2000-2006	B6	8E/H
A4	2004-2009	B7	8K/H
A4 & Allroad	2007-2015	B8	8W
A4 & Allroad	2015-	B9	8W
A5	2007-2016		8T/F
A5	2016-		8W6
A6 (prev. 100)	1994-1997	C4	4A
A6 & Allroad	1997-2004	C5	4B
A6 & Allroad	2004-2011	C6	4F
A6 & Allroad	2011-2018	C7	4G
A6 & Allroad	2018-	C8	4K
A7	2010-2018		4G8
A7	2018-		4K8
V8 (later A8)	1988-1993		4C
A8 (prev. V8)	1994-2002	D2	4D
A8	2002-2009	D3	4E
A8	2010-2017	D4	4H
A8	2017-	D5	4N
Coupé	1980-1988	B2	81/85
Quattro (Coupé)	1980-1991	B2	85
Coupé	1988-1996	B3	8B
Cabriolet	1991-2000	B3	8G
Q2	2016-	GA
Q3	2011-2018		8U
Q3	2018-	F3
Q5	2008-2017		8R
Q5	2017-	FY
Q7	2005-2015		4L
Q7	2015-		4M
R8	2006-2015		42
R8	2015-		4S
RS2 Avant	1994-1995	B4	8C / P1
TT	1998-2006		8N
TT	2006-2014		8J
TT	2014-	FV	8S