According to Bank branch search at http://www.bankservafrica.com/en-gb/bankbranchlisting.aspx it is "CORP CORE BANKING/GTS JHB". Also look at Which_branch_if_first_national_bank_south_africa_has_code_255005 If you are having trouble using this as a branch code, put two zeroes on the end as branch codes need to be eight digits for use in some banks.
The branch code 250-409 is assigned to First National Bank (South Africa), Roodeport Branch, Johannesburg.
The branch code for FNB East Gate is 253145. FNB or First National Bank is located in South Africa and is one of South Africa's big four banks.
260446
261550
254605
The bank branch database at http://www.bankserv.co.za/bamanual.cfm has no branch recorded with that code.
First national bank in South Africa
First National Bank, Govan Mbeki Avenue branch, Port Elizabeth
Centurion 838
cbnauS33
The branch code 250-409 is assigned to First National Bank (South Africa), Roodeport Branch, Johannesburg.
branch code 250149
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The branch code for FNB East Gate is 253145. FNB or First National Bank is located in South Africa and is one of South Africa's big four banks.
260446
261550
280272