This works for alpha being upper case *only*:

=AND(LEN(A1)=6,ISNUMBER(--RIGHT(A1,5)),CODE(A1)=65,CODE(A1)<=90)

To accept upper *or* lower case alpha:

=AND(LEN(A1)=6,ISNUMBER(--RIGHT(A1,5)),
OR(AND(CODE(A1)=65,CODE(A1)<=90),AND(CODE(A1)=97 ,CODE(A1)<=122)))

--
HTH,

RD

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"Dan" wrote in message
...
Looking for help to validate a single cell to an alphanumeric entry that
is
exacly 6 characters in length with the first character required to be a
letter and the remaining characters to be numbers. Exp: A00142 orT10001,
ect.
--
Dan