The assignment of IP addresses is managed by Internet Assigned Numbers Authority. Regional Internet Registries are responsible for specific regions of the World. They allocate IP address blocks to Internet Service providers from United States.
A Portland IP address is assigned to an ISP or hosting provider that provides Internet services in Oregon, United States. Further, ISPs and hosting services allocate IP addresses to their subscribers, private persons or companies.
The most common Portland IPs blocks have the following format:
You may change your public IP address by using a proxy, a VPN service or TOR. Check the Hide IP page for recommended services with servers in United States.
You may find above samples of IP addresses blocks allocated for Portland, Oregon, United States. The information is extracted from the IP2Location LITE database available from http://lite.ip2location.com. At this time, only IPv4 addresses are listed (no IPv6 addresses).