Interestingly, bots and crawlers also come with their unique UA strings. For example, a Chrome browser on an iPhone 6 will introduce itself using a different UA string than a Safari browser on the same phone.Įvery device type, including phones, tablets, desktops, may come with its own UA string that makes it possible to detect this device for any purpose. There are millions of User-Agent string combinations given that UA strings change with the software and hardware. User-Agent string list for different device types We go into a lot more detail, and examine what makes up a UA string, and how you can use user-agent parsing to your advantage, in our article User-Agent Parsing: How It Works And How Can It Be Used. Of course this requires using a device detection solution which translates UA strings into understandable software and hardware information. The User-Agent string tells the server what the visiting device is (among many other things) and this information can be used to determine what content to return. The User-Agent (UA) string is contained in the HTTP headers and is intended to identify devices requesting online content.
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