Understanding Hex dumps for ISO8583 messages.

Pls note the following. The first 4 digits dont matter. All data in the trace is Hexadecimal. Youll need to convert them to the relevant format to interpret them. Also the last column doesnt matter

0000 01 99 30 32 33 30 f2 3e 04 95 2b e0 84 20 00 00 ..0230.>..+.. ..Comment by Opeoluwa Osunkoya: Irrelevant. The first column is always irrelevant.Comment by Opeoluwa Osunkoya: The first 2 values in the message shows the number of characters in the message. The first byte of HEX is multiple of 256 and the second byte of HEX is the remainder. To interpret, 01 from HEX to decimal is 1 and 99 from HEX to decimal is 153. Hence, the remaining characters are 256+153 = 409 characters till message completion.Comment by Opeoluwa Osunkoya: The next 4 bytes are the message type. Converting from HEX to ASCII using the software from comment 1. Comment by Opeoluwa Osunkoya: The next 16 Hexs show the fields that are present (also called the Bitmap). Use the windows calculator to do that (see pictures below). When you convert to binary. E.G. 1111 0010 0011 11100000 0100 1001 01010010 1011 1110 00001000 0100 0010 00000000 0000 0000 00000000 0000 0000 00100000 0100 0000 00000000 0000 0010 0010The first digits 1111 means fields 1,2,3,4 are present. Count on and enjoy.

0010 00 02 04 00 00 22 31 39 35 30 36 31 30 35 30 30 ....."1950610500Comment by Opeoluwa Osunkoya: Since the previous Bitmap shows that there is field 2, field to is expected. Since field 2 is a LLVAR, variable length field, the first 2 digits show the length of the field 2. Converting 31 39 to Decimal means 19. Hence the next 19 are the contents.Comment by Opeoluwa Osunkoya: The next 19 digits convert to decimal you Genius hence its 5061050000000000022 using that software above.

0020 30 30 30 30 30 30 30 30 30 32 32 30 31 32 30 30 0000000002201200Comment by Opeoluwa Osunkoya: The next 6 digits are the next field hint its field 3 from comment [005]. Its 012000. Its a fixed length field so go figure why there is no length indicator.

0030 30 30 30 30 30 30 30 30 31 30 30 30 30 30 35 30 0000000010000050Comment by Opeoluwa Osunkoya: Field 4: Amount 12 characters

0040 35 32 31 31 33 34 38 33 36 33 31 37 33 31 36 31 5211348363173161

0050 32 30 30 30 32 30 38 31 35 30 38 30 38 31 33 30 2000208150808130

0060 30 30 30 30 43 30 30 30 30 30 30 30 30 43 30 30 0000C00000000C00

0070 30 30 30 30 30 30 30 36 36 32 37 36 38 31 32 37 0000000662768127

0080 35 30 36 31 30 35 30 30 30 30 30 30 30 30 30 30 5061050000000000

0090 30 32 32 3d 31 35 30 38 32 32 31 30 30 30 30 30 022=150822100000

00a0 30 30 32 30 35 36 36 30 30 32 32 31 31 30 31 34 0020566002211014

00b0 30 30 31 34 30 39 38 37 36 35 34 33 32 31 32 33 0014098765432123

00c0 34 35 36 5f 26 23 40 28 2a 40 56 4c 41 20 74 72 456_@(*@VLA tr

00d0 61 69 6e 69 6e 67 23 29 40 23 56 49 20 20 20 20 aining#)@#VI

00e0 20 20 20 20 20 20 20 4c 47 4e 47 35 36 36 30 32 LGNG56602

00f0 30 32 30 35 33 35 36 36 44 30 30 30 30 30 30 30 02053566D0000000

0100 31 30 30 30 30 30 31 30 30 30 30 30 30 32 30 35 1000001000000205

0110 36 36 30 30 30 30 30 30 30 31 30 30 30 30 30 30 6600000001000000

0120 30 30 30 30 30 31 30 30 30 30 43 30 30 30 30 30 0000010000C00000

0130 30 30 30 43 30 30 30 30 30 30 30 30 31 31 30 30 000C000000001100

0140 32 33 34 35 36 37 38 39 35 30 31 35 35 31 30 32 2345678950155102

0150 30 31 35 31 31 31 34 43 30 30 32 30 30 30 30 35 0151114C00200005

0160 38 24 00 00 00 00 00 00 00 50 42 53 72 63 20 20 8$.......PBSrc

0170 20 20 20 20 20 50 42 53 6e 6b 20 20 20 20 20 20 PBSnk

0180 20 33 36 33 31 37 33 30 30 30 31 31 30 4f 6e 55 363173000110OnU

0190 73 54 6f 74 61 6c 73 20 20 30 30 sTotals 00

Data: 019930323330f23e04952be0842000000002040000223139...

[Length: 411]

Additional Notes

The Bitmap Field(comment 005)

f2 3e 04 95 2b e0 84 20 00 00 00 02 04 00 00 22

This translates to

1111 0010 0011 1110Comment by Opeoluwa Osunkoya: DE1: Secondary Bitmap. The first Data Element(DE) indicates the presence of DEs 65-128Comment by Opeoluwa Osunkoya: DE 2: PAN. 1 indicates presence, 0 absence. As the DE is LLVAR.. (variable length up to 19 characters) the data in that field will be the number of characters and then the value. E.G. 15506105345612034 i.e 15 characters with value 506105345612034Comment by Opeoluwa Osunkoya: DE 3: Processing code. n6Comment by Opeoluwa Osunkoya: DE 4: Transaction Amount. n12Comment by Opeoluwa Osunkoya: DE 5: Settlement Amount. n12. AbsentComment by Opeoluwa Osunkoya: DE 7: Transmission Date and Time. n10. PresentComment by Opeoluwa Osunkoya: DE 8: Billing fee amount. n8. PresentComment by Opeoluwa Osunkoya: DE 9: Settlement Conversion rate. n8. AbsentComment by Opeoluwa Osunkoya: DE 11: Systems Trace Audit Number. n6. PresentComment by Opeoluwa Osunkoya: DE 12: Local Transaction Time. n6. PresentComment by Opeoluwa Osunkoya: DE 13: Local Transaction Date. n4. PresentComment by Opeoluwa Osunkoya: DE 14: Expiration Date. n4. PresentComment by Opeoluwa Osunkoya: DE 15: Settlement Date. n4. Present

0000 0100 1001 0101Comment by Opeoluwa Osunkoya: DE 18: Merchant Category Code. n4. AbsentComment by Opeoluwa Osunkoya: DE 22: POS Entry Mode. n3. PresentComment by Opeoluwa Osunkoya: DE 25: POS Condition Code. n2 Comment by Opeoluwa Osunkoya: DE 26: POS PIN Capture Code. n2Comment by Opeoluwa Osunkoya: DE 27: Authorization ID Response Length. n1. PresentComment by Opeoluwa Osunkoya: DE 28: Amount, Transaction Fee(Surcharge). X+n8. X means action(usually credit C or Debit D) e.g D00050000.Comment by Opeoluwa Osunkoya: DE 30: Amount, Transaction Processing Fee. X+n8Comment by Opeoluwa Osunkoya: DE 32: Acquiring Institution ID Code. LLVAR

0010 1011 1110 0000Comment by Opeoluwa Osunkoya: DE 35: Track 2 Data. LLVAR. Comment by Opeoluwa Osunkoya: DE 37: Retrieval Reference Number. an12.Comment by Opeoluwa Osunkoya: DE 38: Authorization Identification Response. an6.Comment by Opeoluwa Osunkoya: DE 39: Response Code. an2Comment by Opeoluwa Osunkoya: DE40: Service Restriction Code. n3Comment by Opeoluwa Osunkoya: DE 41: Card Acceptor Terminal ID. ans8Comment by Opeoluwa Osunkoya: DE 42: Card Acceptor ID Code. ans15Comment by Opeoluwa Osunkoya: DE 43: Card Acceptor Name Location. ans40

1000 0100 0010 0000Comment by Opeoluwa Osunkoya: DE 49: Currency Code. n3Comment by Opeoluwa Osunkoya: DE 54: Additional Amounts. LLVAR Comment by Opeoluwa Osunkoya: DE 59: Echo Data. LLVAR

0000 0000 0000 0000

0000 0000 0000 0010Comment by Opeoluwa Osunkoya: DE 95: Replacement amounts. an42

0000 0100 0000 0000Comment by Opeoluwa Osunkoya: DE 102: Account Identification 1. LLVAR

0000 0000 0010 0010Comment by Opeoluwa Osunkoya: DE 123. POS Data Code. LLVARComment by Opeoluwa Osunkoya: DE 127: Postilion Private Field. 1 means that some of the DEs 127.2 to 127.39 have content.

To understand the content of any field, Pls consult the document below.

an = alphabet + number

(1 100) = number of characters of the preceding data type.

Appendix1

To convert from Hexadecimal to binary.

1. Set windows calculator to programmer mode

2. Set the calculator to Hexadecimal mode and enter the HEX value

3. Click Bin to convert to binary.

dg_postilion.chm

ASCII.exe