device detection

Your iPhone or iPad has an AXXXX code printed on the back or buried in Settings. It tells you which model the device is, but only if you have the mapping. Here is the full A-code to device-name reference 51Degrees uses, along with a note on how Apple's three different identifiers fit together and where to find each one.

This blog explains how DuckDuckGo’s web crawlers, including DuckDuckBot and DuckAssistBot, interact with website content. It outlines their different roles, how they follow robots.txt directives, and the management of crawler access and content visibility.

This blog explains how Apple’s web crawlers, including Applebot and Applebot-Extended, work across its ecosystem to surface content in Siri, Spotlight, and Safari. It outlines the different crawlers, their purposes—such as search indexing, feed updates, and AI training—and how enabling them can improve content visibility, traffic, and control over how content is used, particularly in generative AI.

Find out how we classify Perplexity's AI web crawlers.

Automatic data updates in the 51Degrees Pipeline API ensure device detection engines always use the latest data without manual intervention. With configurable polling, validation, and safe file replacement, this feature minimizes maintenance, prevents stale detections, and scales efficiently across single servers or large clusters.

Find out how we classify Meta's crawlers and AI content scrapers.

User-Agent Client Hints were always going to be a "tax" on the web. In this article we recap the history, unpack the current state, and look to the future.

Discover how semi-static and static JavaScript integrations let you capture rich client-side evidence.

Find out about the hidden gems of cellular telecoms and learn how to use them in your business.

Learn about a new property from 51Degrees to aid Device Detecton accuracy when User-Agent data shows frozen platform versions.