CODEWITHSUNDEEP
iso8583
Emileydis Rodriguez
Emileydis Rodriguez

Reputation: 9

How to Parse ISO 8583 message

How can I determine where the MTI start in an ISO 8583 message?

00 1F 60 00 05 80 53 08 00 20 20 01 00 00 80 00 00 92 00 00 00 31 07 00 05 31 32 33 34 31 32 33 34

Upvotes: 0

Views: 4616

Answers (3)

Uwe
Uwe

Reputation: 143

In this message a 2 byte header length is used:

00 1F

But some Hosts also use 4 byte header length for ISO 8583 messages. So you can not generalize it, it depends on what you have arranged with the sending Host.

Upvotes: 0

A.Rashad
A.Rashad

Reputation: 1064

position of the MTI is network specific, and should be explained in their technical specifications document.

You can eyeball the MTI by looking for values such as 0100, 0110, 0220, 0230, 0800, etc. in the first 20 bytes, and the are typically followed by 8 to 16 bytes of BMP data

your data shows MTI = 800 with a bitmap = 20 20 01 00 00 80 00 00 That means the following fields are present, 3,11,24,41, with DE 3 (PRoc code) = 920000, DE 11 (STAN) = 003107, and the remaining is shared among 24 and 41, I am not sure about their sizes

Upvotes: 0

M.M
M.M

Reputation: 141618

In that message 00 1F is the length, and 60 00 05 80 53 is the TPDU. (Those aren't part of ISO8583). 08 00 is the MTI. The next 8 bytes are the primary bitmap.

You can buy a copy of the ISO8583 specification from ISO. There is an introduction on wikipedia

Upvotes: 4

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