Julian De Bono was last seen in the early hours of Sunday morning wandering down Yarmouth Road towards London Road. Specialist divers have been drafted in.
Searches have taken place in and around the nearby river as well as the wider area where he was last seen using drones and small craft on the water, Suffolk Police said.
Dive teams to search river in Ipswich for missing man Julian De Bono itv.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from itv.com Daily Mail and Mail on Sunday newspapers.
Julian De Bono, 63, last spotted in the Yarmouth Road area of Ipswich at about 1.45am last Sunday, with police confirming a body had been found just under a week later