The recent addition coolly finished a neat move involving Derek Asamoah to cancel out Malvind Benning’s 29th-minute free-kick.
Mansfield started well as new signings Nathan Thomas and Matt Green both saw goal-bound shots deflected for corners in the early stages.
And the home side took the lead on 29 minutes through Benning’s thunderous 30-yard free-kick.
The visitors responded well – Jason Kennedy’s long-range effort bringing out the best in goalkeeper Scott Shearer – and Carlisle levelled through Ibehre two minutes into time added on as he calmly slotted low past Shearer.
Chris Clements twice went close with shots over the bar for the Stags, before Asamoah failed to connect with Angelo Balanta’s cross with 14 minutes remaining as both sides pushed for a winner.
Adi Yussuf was then inches away from finding a late winner for Mansfield after Green got behind the Carlisle defence and delivered an inviting cross to the substitute.