192.x IPs and 10.x IPs are lan IPs as shaba said.
Quote from emule forums:
Quote:
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Sources containing IPs of the private IP classes A (10.0.0.0 - 10.255.255.255), B (172.16.0.0 - 172.31.255.255), C (192.168.0.0 - 192.168.255.255), local host (127.0.0.0 to 127.255.255.254) and all IPs starting with null (0.x.x.x) are not valid in the internet. Such sources received by client to client source exchange or by servers are dropped when this filter is activated.
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Dynamic IPs for ISPs are easier to manage as they can reset their database without remembering IPs. This also help them control traffic as people usually don't install web services (bandwidth consuming) on machines with dynamic IPs.
ISPs DO keep track of the last few IPs you had with the corresponding time. They usually change your IP a couple of times a week even if you are always connected (ie via a router).
Ciao