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Well sometimes my IP stays the same for months and I know sometimes I am offline when the lease expires (And sometimes I manually renew the lease and @ next bootup the IP is the same)
I guess I dont understand!
Offline for how long? Typically you would automatically renew at half way. So if your ISP has setup your lease for 2 days, you would likely renew every 24 hours. If you happen to just be offline for 1 day, it probably won't matter. And a manual renew will be addressed right away. A reboot will just cause another DHCP request. And if your lease is not expired (or effectively released), you'll get the same IP.
If the subscription is for dynamically assigned IP addresses, the IP address can change and you shouldn't expect it to always be the same. If it's a static IP address, then you can expect it not to change.
Here at home I only have DSL with a subscription for dynamically assigned IP addresses, but for years the IP address stayed the same as if it were a static IP subscription... until recently.
Your router is most likely configured for DHCP. DHCP is a connection protocol where the server (your ISP) dynamically assigns an IP address from a set range of numbers. Your router has a "lease cycle"; this is where you receive an IP address, use the IP address, and either release or renew the address. Your router may not have a set time limit for the cycle, so in that case, your IP address would not change assuming that the router is not restarted or power-cycled. A lot of ISPs don't provide static IPs to residential customers, so you'd need a business account for that.
if someone gets a modem which is also a router, will the IP address change?
Comcast (an ISP many are familiar with) changes your WAN IP based on the MAC address of your router, which can be quickly tested. Reverting back to the original router will usually restore its old IP address, until Comcast changes it at random.
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