Domestic
Code - Definition

YY -- Address and 5-digit zip code match
NY -- 5-digit zip code matches only
YN -- Address matches only
NN -- Neither Address nor zip code match
YY -- Address and 9-digit zip code match
NY -- 9-digit zip code matches only
XX -- Card number not on file
XX -- Address info not verified for domestic transaction
XX -- Retry - System unavailable
XX -- Service not supported
XX -- Address verification is not allowed for card type
XX -- Address verification requested – not received

International
Code - Definition

XX -- Global non-AVS participant
YN -- Address matches only
NN -- Address and Postal Code do not match
YY -- Address and Postal Code match
NN -- Address information not verified for international transaction
NY -- Postal Code Matches only