It must for QHostInfo, but DNS servers are not required to have that label. It appears to be a good practice the majority of admins follow, but it's not universal, so we cannot require it. But if it does resolve, then RFC 2606 requires it resolve to 127.0.0.1. Task-number: QTBUG-129335 Change-Id: Ib3b11de6616665658a20fffd754f2fbd78780b1c Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io> Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io> (cherry picked from commit 252bd7c67ce7a0ed3c41059f551f87f0f77b5606) Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
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