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if IP address has DHCP lease, then IPAM displays it as 'Used' as long as the lease information is present on the DHCP server. When IPAM detects, that DHCP lease of an address has ended, it marks the IP address as 'Available' not 'Transient'. That's the difference against behavior of ICMP/SNMP scan.
If there was an illegal use of IP address within DHCP scope (IP was not assigned by the server but IP responded to ping scan) and such IP is no longer responsive, then it will become 'Transient'.