shadow/man/login.defs.d/SUB_UID_COUNT.xml

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<varlistentry condition="subids">
  <term><option>SUB_UID_MIN</option> (number)</term>
  <term><option>SUB_UID_MAX</option> (number)</term>
  <term><option>SUB_UID_COUNT</option> (number)</term>
  <listitem>
    <para>
      If <filename>/etc/subuid</filename> exists, the commands
      <command>useradd</command> and <command>newusers</command> (unless
      the user already have subordinate user IDs) allocate
      <option>SUB_UID_COUNT</option> unused user IDs from the range
      <option>SUB_UID_MIN</option> to <option>SUB_UID_MAX</option> for each
      new user.
    </para>
    <para>
      The default values for <option>SUB_UID_MIN</option>,
      <option>SUB_UID_MAX</option>, <option>SUB_UID_COUNT</option>
      are respectively 100000, 600100000 and 65536.
    </para>
  </listitem>
</varlistentry>