Someone else had the IP assigned, then, or you're behind some sort of NAT with someone else. The ISP very likely holds a record of which device had a particular address assigned at any given time. At where I live, addresses are usually lent for pretty much forever. I have mine for 8 years, unchanged. Even my mobile carrier latches the same address for months even.
Someone else had the IP assigned, then, or you're behind some sort of NAT with someone else. The ISP very likely holds a record of which device had a particular address assigned at any given time. At where I live, addresses are usually lent for pretty much forever. I have mine for 8 years, unchanged. Even my mobile carrier latches the same address for months even.