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ISO8583 Message type indicator (MTI)


The ISO8583 message type indicator (MTI) is a four-digit numeric field which indicates the overall function of the message. A ISO8583 message type indicator (MTI) includes the following information.
  • ISO 8583 version (0xxx)
  • Message Class (x1xx)
  • Message Function (xx0x)
  • Message Origin (xxx0)
  • as described below.


    First Digit

    ISO 8583 version:

    MTI Version
    0xxx 1987
    1xxx 1993
    2xxx 2003
    3xxx Reserved by ISO
    4xxx
    5xxx
    6xxx
    7xxx
    8xxx National use
    9xxx Private use

    Second Digit

    ISO8583 message's classification:

    MTI Meaning
    x1xx Authorization Message
    x2xx Financial Message
    x3xx File Actions Message
    x4xx Reversal Message
    x5xx Reconciliation Message
    x6xx Administrative Message
    x7xx Fee Collection Message
    x8xx Network Management Message
    x9xx Reserved by ISO

    Third Digit

    ISO8583 message's function:

    MTI Meaning
    xx0x Request
    xx1x Request Response
    xx2x Advice
    xx3x Advice Response
    xx4x Notification
    xx8x Response Acknowledgement
    xx9x Negative Acknowledgement

    Fourth Digit

    ISO8583 message's Origin:

    MTI Meaning
    xxx0 Acquirer
    xxx1 Acquirer Repeat
    xxx2 Issuer
    xxx3 Issuer Repeat
    xxx4 Other
    xxx5 Other Repeat

    But in practice, sometimes, the MTI version code 0xxx will be used, instead of using the "standard" format 1xxx or 2xxx for versions 1993 or 2003.


    ISO MTI Code

    MTI Start With
    ISO8583
    MTI Version
    Meaning Usage
    1987 1993 2003
    0100 1100 2100 Authorization Request Acquirer Send Authorization Request Message to Issuer
    0110 1110 2110 Authorization Request Response Issuer Send Authorization Request Response Message back to Acquirer
    0120 1120 2120 Authorization Advice Acquirer send Authorization Advice Request Message to Issuer
    0121 1121 2121 Authorization Advice Repeat Acquirer send Authorization Advice Repeat Message to Issuer
    0130 1130 2130 Authorization Advice Response Issuer send Authorization Advice Response Message back to Acquirer
    0200 1200 2200 Financial Transaction Request Acquirer Send Financial Transaction Request Message to Issuer
    0210 1210 2210 Financial Transaction Request Response Issuer Send Financial Transaction Response Message back to Acquirer
    0220 1220 2220 Financial Transaction Advice Acquirer Send Financial Transaction Advice Request Message to Issuer
    0221 1221 2221 Financial Transaction Advice Repeat Acquirer Send Financial Transaction Advice Repeat Message to Issuer
    0230 1230 2230 Financial Transaction Advice Response Issuer Send Financial Transaction Advice Repeat Response Message Back to Acquirer
    0320 1320 2320 Batch Upload Request Acquirer send Batch Upload Request Message to Issuer
    0330 1330 2330 Batch Upload Response Issuer send Batch Upload Response Message to Acquirer
    0400 1400 2400 Acquirer Reversal Request Acquirer Send Reversal Request Message to Issuer
    0402 1402 2402 Card Issuer Reversal Request Card Issuer Send Reversal Request Message to Acquirer
    0410 1410 2410 Acquirer Reversal Request Response Acquirer send reversal request response back to Issuer
    0412 1412 2412 Card Issuer Reversal Request Response Card Issuer Send Reversal Request Response Message back to Acquirer
    0420 1420 2420 Acquirer Reversal Advice Acquirer Send Reversal Advice message to Card Issuer
    0421 1421 2421 Acquirer Reversal Advice Repeat Acquirer Send Reversal Advice Repeat message to Card Issuer
    0430 1430 2430 Acquirer Reversal Advice Response Acquirer Send Reversal Advice Response message back to Card Issuer
    0432 1432 2432 Card Issuer Reversal Advice Response Card Issuer Send Reversal Advice Response message back to Acquirer
    0500 1500 2500 Acquirer Reconciliation Request Acquirer Send Reconciliation Request Message to Card Issuer
    0502 1502 2502 Issuer Reconciliation Request Issuer Send Reconciliation Request Message to Acquirer
    0510 1510 2510 Acquirer Reconciliation Request Response Acquirer send Reconciliation Request Response message back to Card Issuer
    0512 1512 2512 Issuer Reconciliation Request Response Issuer Send Reconciliation Request Response Message back to Acquirer
    0520 1520 2520 Acquirer Reconciliation Advice Acquirer send Reconciliation Advice message to Card Issuer
    0521 1521 2521 Acquirer Reconciliation Advice Repeat Acquirer send Reconciliation Advice Repeat message to Card Issuer
    0522 1522 2522 Issuer Reconciliation Advice Issuer send Reconciliation Advice message to Acquirer
    0523 1523 2523 Issuer Reconciliation Advice Repeat Issuer send Reconciliation Advice Repeat message to Acquirer
    0530 1530 2530 Acquirer Reconciliation Advice Response Acquirer send Reconciliation Advice Response message to Card Issuer
    0532 1532 2532 Issuer Reconciliation Advice Response Issuer send Reconciliation Advice Response message to Acquirer
    0604 1604 2604 Administrative Request Acquirer/Card Issuer Send Administrative Request Message
    0605 1605 2605 Administrative Request Repeat Acquirer/Card Issuer Send Administrative Request Repeat Message
    0614 1614 2614 Administrative Request Response Acquirer/Card Issuer Send Administrative Request Response Message
    0624 1624 2624 Administrative Advice Acquirer/Card Issuer Send Administrative Advice Message
    0625 1625 2625 Administrative Advice Repeat Acquirer/Card Issuer Send Administrative Advice Repeat Message
    0634 1634 2634 Administrative Advice Response Acquirer/Card Issuer Send Administrative Advice Response Message
    0644 1644 2644 Administrative Notification Acquirer/Card Issuer Send Administrative Notification Message
    0720 1720 2720 Acquirer Fee Collection Advice Acquirer Send Fee Collection Advice Message to Issuer
    0721 1721 2721 Acquirer Fee Collection Advice Repeat Acquirer Send Fee Collection Advice Repeat Message to Issuer
    0722 1722 2722 Issuer Fee Collection Advice Card Issuer Send Fee Collection Advice Message to Acquirer
    0723 1723 2723 Issuer Fee Collection Advice Repeat Card Issuer Send Fee Collection Advice Repeat Message to Acquirer
    0730 1730 2730 Acquirer Fee Collection Advice response Acquirer Send Fee Collection Advice Response Message to Card Issuer
    0732 1732 2732 Issuer Fee Collection Advice response Card Issuer Send Fee Collection Advice Response Message to Acquirer
    0740 1740 2740 Acquirer Fee Collection Notification Acquirer Send Fee Collection Notification Message to Card Issuer
    0742 1742 2742 Issuer Fee Collection Notification Card Issuer Send Fee Collection Notification Message to Acquirer
    0800 1800 2800 Network/Key Management Request Acquirer/Card Issuer Send Network/Key Management Request Message
    0810 1810 2810 Network/Key Management Response Acquirer/Card Issuer Send Network/Key Management Response Message
    0820 1820 2820 Network Management Advice Acquirer/Card Issuer Send Network Management Advice Message
    0821 1821 2821 Network Management Advice Repeat Acquirer/Card Issuer Send Network Management Advice Repeat Message
    0830 1830 2830 Network Management Advice Response Acquirer/Card Issuer Send Network Management Advice Response Message