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IP addresses can be categorized in different ways based on their scope, allocation, and usage:
Assigned by Internet Service Providers (ISPs) and are globally unique and routable across the internet.
These are the addresses that other devices on the internet use to communicate with your network.
Example: 203.0.113.1
Used within a private network and are not routable on the public internet.
These addresses are defined in RFC 1918 and include the following ranges:
10.0.0.0 to 10.255.255.255172.16.0.0 to 172.31.255.255192.168.0.0 to 192.168.255.255
Permanently assigned to a device and do not change over time.
Typically used for servers, network equipment, and other infrastructure that needs a consistent address.
Usually costs extra from your ISP for home/small business connections.
Temporarily assigned to a device and can change over time (typically when the device reconnects to the network).
Most home internet connections use dynamic IP addresses.
The assignment is typically handled through DHCP (Dynamic Host Configuration Protocol).
IP geolocation is the process of determining the geographic location of a device using its IP address. While this can provide useful information, it's important to understand its limitations:
IP geolocation databases map IP addresses to geographic locations. These databases are compiled from various sources:
IP geolocation is not always perfectly accurate for several reasons:
- Country level: Usually highly accurate (95-99%)
- Region/state level: Moderately accurate (70-90%)
- City level: Less accurate (50-80%)
- Postal code level: Least accurate (25-60%)
IP lookup tools are used for various purposes across different industries:
Identifying suspicious login attempts from unusual locations
Restricting content or services based on geographic location
Tracking and blocking known malicious IP addresses
Customizing content and language based on visitor's location
Enforcing region-specific legal requirements or restrictions
Understanding geographic distribution of website visitors
Delivering location-relevant advertisements
Troubleshooting connectivity issues and network performance
Identifying the physical location of servers or services
Optimizing content delivery networks for better performance
Checking if your VPN is correctly masking your actual location
Tracing the origin of emails through the IP addresses in headers
Understanding what information is revealed by your IP address