List of ISBN registration groups

The registration group or identifier group is the second element in a 13-digit <a href="/facts/ISBN/15AdSPa9">ISBN</a> (first element in a 10-digit ISBN) and indicates the country, geographic region, or language area where a book was published. The element ranges from one to five <a href="/facts/Numerical_digit/JJdLBoGT">numerical digits</a>.
In 2007, the length of an ISBN changed from 10 to 13 digits, and a new 3-digit prefix (978 or 979) was added in front of 10-digit ISBNs. The following registration groups are compatible with or without a 978- prefix:

<ul><li>0–5</li>
<li>600–639</li>
<li>64–69</li>
<li>7</li>
<li>80–94</li>
<li>950–989</li>
<li>9900–9989</li>
<li>99900–99999</li></ul>
The following must have a 979- prefix:

<ul><li>(979-0 is reserved for <a href="/facts/International_Standard_Music_Number/9TvAErAh">International Standard Music Numbers</a> for <a href="/facts/Sheet_music/P1rGJt0t">sheet music</a>)</li>
<li>979-10 through 979-13</li>
<li>979-8</li></ul>
Shorter registration group numbers are generally used for countries or regions with greater publishing volume. Because a longer number leaves room for fewer publishers and ISBNs, several countries have more than one number assigned. On the other hand, some countries (Australia, Switzerland, <a href="/facts/Fiji/JU8Hs8WH">Fiji</a>) have no unique number because they fall in a broader geographic region or language area.

List of ISBN registration groups open-in-new

List of ISBN registration groups