For the Tigers, Robbie Brady returned from a thigh problem at the expense of Aaron Mclean, who dropped to the bench.
Ipswich also made just one change, Jason Scotland, who came on and scored the late equaliser against Southampton in midweek, replacing Lee Martin.
Brady was soon celebrating his return as he watched his 18th-minute left-footer from the edge of the area deflect into the net off central defender Tommy Smith.
Vito Mannone saved at the foot of his left-hand post to deny a 30-yarder from Jay Emmanuel-Thomas as Ipswich attempted to hit back.
It proved a rare attack from Ipswich as Hull dominated possession, forcing five corners in a half where Matty Fryatt looked particularly dangerous.
Brady did not reappear for the second half,being replaced by Mclean.
Ipswich started with a flourish, brave blocks by Andy Dawson and Jack Hobbs preventing an equaliser.
Robert Koren lifted the pressure with a smart turn and shot from the edge of the area whcih beat goalkeeper Alex McCarthy diving to his left in the 54th minute.
A 67th-minute penalty from Grant Leadbitter handed Ipswich a lifeline after Smith had gone down in the area under the challenge of Mclean, who was attempting an acrobatic clearance.
Midfield man Leadbitter then struck a rasping drive past Mannone to level the scores from outside the area in the 70th minute to leave the game on a knife-edge.
The injured Leadbitter was replaced by Ryan Stevenson - Ipswich’s final susbtitution - and Manchester United loan striker Josh King replaced Cameron Stewart for the Tigers as both sides went for the winner.
Koren went close iwhen he shot inches wide as the game went into four minutes of stoppage time but the entertaining encounter ended all square.
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