IBAN format · GB
United Kingdom IBAN format
IBANs issued in United Kingdom are 22 characters long and follow the ISO 13616 structure below.
Country code
GB
Total length
22 chars
Check-digit algo
MOD 97-10
ISO 13616 pattern
4!a6!n8!n
4 letters (letters (A–Z)), then 6 digits (digits (0–9)), then 8 digits (digits (0–9))
Structure breakdown
The IBAN is read left to right: a 2-letter country code, 2 check digits, then the country-specific BBAN split into 3 fields.
Country code
ISO 3166 — United Kingdom
GB
Check digits
MOD 97-10 checksum
29
BBAN field 1
4 letters · letters (A–Z)
NWBK
BBAN field 2
6 digits · digits (0–9)
601613
BBAN field 3
8 digits · digits (0–9)
31926819