View source for IBAN formats allowing only numeric BBAN

The BBAN starts after country code and check digits, i.e. after position 4 of the electronic format.

==Maps==
http://anna.info/maps/iban

==Length frequency==
As of 2012-08-10.


Some countries have numeric-only BBAN formats. The one with the highest frequency is the 20n format, being used by five countries.

Twelve countries use only full groups of four:
*12 BE
*16 BS, AT, EE, LT
*20 CZ, SK, ES, SE, TN
*24 HU, PL

Countries using formats that are only numeric after the country code and the check characters are:
{| class="wikitable sortable"
! BBAN length
! ISO 3166-1 alpha-2 codes for countries
! Quantity of countries using that format
! Length is a multiple of 4
|----
| 11
| NO 
| 1
| no
|----
| 12
| BE 
| 1
| yes
|----
| 14
| FO, GL, FI (including AX), DK 
| 4
| no
|----
| 15
| SI 
| 1
| no
|----
| 16
| BS, AT, EE, LT 
| 4
| yes
|----
| 17
| HR, CR 
| 2
| no
|----
| 18
| DE, ME, RS 
| 3
| no
|----
| 19
| AE, IL 
| 2
| no
|----
| 20
| CZ, SK, ES, SE, TN 
| 5
| yes
|----
| 21
| PT 
| 1
| no
|----
| 22
| IS 
| 1
| no
|----
| 23
| MR 
| 1
| no
|----
| 24
| HU, PL 
| 2
| yes
|----
| 11-24
| 
| 28
| 12
|}

==Hexdecimal representation==
For a conversion from hex to decimal one may need to add leading zeros, i.e. knowledge of the length of the decimal IBAN is necessary.
===16 digit hex===
Numeric BBAN of up to 19 digits can be converted to 16 digit BBAN in hex.
* 9999 9999 9999 9999 9999 (20n, 99999999999999999999) is 56BC 75E2 D630 FFFF F (17h, 56BC75E2D630FFFFF)
* FFFF FFFF FFFF FFFF (16h, FFFFFFFFFFFFFFFF) is 1844 6744 0737 0955 1615 (20n, 18446744073709551615)
* Eleven countries use between 16 and 19 digits:
 16	 BS, AT, EE, LT
 17	 HR, CR
 18	 DE, ME, RS
 19	 AE, IL

===20 digit hex===
Numeric BBAN of up to 24 digits can be converted to 20 digit BBAN in hex.
* FFFF FFFF FFFF FFFF FFFF (20h, FFFFFFFFFFFFFFFFFFFF) is 1208 9258 1961 4629 1747 0617 5 (25n, 1208925819614629174706175)
* Ten countries use between 20 and 24 digits: 
 20	 CZ, SK, ES, SE, TN
 21	 PT
 22	 IS
 23	 MR
 24	 HU, PL