Invalid or private IP

1. What is check-my-ip? check-my-ip is mapping of an IP address or MAC address to the real-world geographic location of an Internet connected to a computing device or mobile device. Geolocation involves in mapping IP address to the country, region (city), latitude/longitude, ISP and domain name among other useful things.
2. Where can I get a check-my-ip database? There are a number of commercially available geolocation databases, and their pricing and accuracy may vary. Ip2location, MaxMind, Tamo Soft and IPligence offer a fee based databases that can be easily integrated into an web application. Most geolocation database vendors offers APIs and example codes (in ASP, PHP, .NET and Java programming languages) that can be used to retrieve geolocation data from the database. We use Ip2Location database to offer a free geolocation data on our website. There are also freely available geolocation databases. Vendors offering commercial geolocation database also offer a Lite or Community edition that provides IP-to-Country mappings.
3. How accurate is check-my-ip? Accuracy of check-my-ip database varies depending on which database you use. For IP-to-country database, some vendors claim to offer 98% to 99% accuracy although typical Ip2Country database accuracy is more like 95%. For IP-to-Region (or City), accracy range anywhere from 50% to 75% if neighboring cities are treated as correct. Considering that there is no official source of IP-to-Region information, 50+% accuracy is pretty good.
4. How does check-my-ip work? ARIN Whois database provides a mechanism for finding contact and registration information for IP resources registered with ARIN. The IP whois information is available for free, and determining the country from this database is relatively easy. When an organization requires a block of IP addresses, a request is submitted and allocated IP addresses are assigned to a requested ISP. Another important and useful service from
check-my-ip maintains a history of IP addresses for both known spammers as well as senders with good email practices. This information contributes to the check-my-ip Reputation System, which gives the check-my-ip Spam & Virus Firewall the ability to block or allow a message based on the sender's IP address. In addition to IP reputation, the check-my-ip team maintains reputation on URLs, which gives the check-my-ip Spam & Virus Firewall the ability to quickly block an email based on a poorly-rated URL contained in the message. By combining both the IP and reputation data, check-my-ip Networks can easily determine whether a message is spam or legitimate email. Once identified, check-my-ip can implement countermeasures to mitigate these threats.
check-my-ip Reputation is one of the many techniques check-my-ip Networks employs within the check-my-ip Spam & Virus Firewall to reinforce its superior 95 percent spam accuracy rate. The check-my-ip Reputation System is a real-time database of IP addresses that have a "poor" reputation for sending valid emails. check-my-ip maintains and manually verifies all IP addresses marked as "poor" on the check-my-ip Reputation System.

Disclaimer: There is nothing in the which is 100% accurate result orienting either virtual world or physical world, so there may a few data have differences with other contemporary data finders.

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