OpenIPApi

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IP インテリジェンス・脅威検出・スマートな API 構築に関するインサイト。

Explainer 6 分で読める

What Is IP Geolocation and How Does It Work?

IP geolocation maps an IP address to a physical location using databases built from ISP data, BGP routing tables, and active probing.

March 10, 2026

Security 9 分で読める

The Developer's Guide to VPN & Proxy Detection

Learn how modern VPN detection works: port patterns, reverse DNS heuristics, ASN ownership checks, and active probing techniques.

March 5, 2026

Security 7 分で読める

Tor Exit Nodes: What They Are and Why They Matter for APIs

Tor exit nodes are the final relay in the Tor network. Understanding them helps you make smarter access control decisions.

February 28, 2026

Use Case 8 分で読める

Using IP Intelligence for Fraud Prevention

Combining geolocation, threat scores, and anomaly detection to block fraudulent signups and transactions before they happen.

February 20, 2026

Explainer 5 分で読める

ASN Lookups: Understanding Autonomous System Numbers

ASNs identify the networks that make up the internet. Here's how to use them to classify traffic by ISP, hosting provider, or enterprise.

February 14, 2026

Engineering 6 分で読める

Smarter Rate Limiting Using IP Data

Plain IP rate limiting is easy to bypass. Combining connection type, ASN, and threat score makes it far more effective.

February 7, 2026