The Useragent string is send as a header by every browser and identifies which browser, rendering engine, operating system and sometimes which device model is being used. The header is called User-Agent. Below is a list of 58 unique useragent strings from mobile devices collected by WhichBrowser.
(QNX; Smart Access R017_H) Mozilla/3.04 (compatible;QNX Voyager 2.03B ;Photon) Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; @YZIC8sI_hvUKHNG%^qut:|}MQnX >T*2X8aE; SV1; QQDownload 707; .NET CLR 2.0.50727; 360EE) Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30; .NET CLR 3.0.04506.648); KSS2_0_99_AAAAQCEfZ5XA7nIad77vAGQlsP3CEcsL2b1efcppAC9wzsI7dTyh5qNX+tNsEfSFhtrjThv6rBc6rlOhIddymv+55T5kBmNdYO5Rw8DUnJ Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; @XHX9bYrI%[qnxcFBl[^vfs_?JWSyQq,aClb-; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022) Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; @XHX9bYrI%[qnxcFBl[^vfs_?JWSyQq,aClb-; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; 360SE) Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; @5xjl6*eqNx:uupz<}Nak?dbI2lMpRPDaxX-K; QQDownload 701; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0) Mozilla/5.0 (Photon; U; QNX x86pc; xx; rv:1.8.1.14) Gecko/20080709 BonEcho/2.0.0.14 Mozilla/5.0 (Photon; U; QNX x86pc; xx; rv:1.8.1.20) Gecko/-0000001 BonEcho/2.0.0.20 Mozilla/5.0 (Photon; U; QNX x86pc; xx; rv:1.8.1.20) Gecko/20090127 BonEcho/2.0.0.20 Mozilla/5.0 (Photon; U; QNX x86pc; xx; rv:1.8.1.5pre) Gecko/20070709 BonEcho/2.0.0.5pre Mozilla/5.0 (QNX Neutrino 6.5.0; armle) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/40.0.2182.0 Safari/537.36 Mozilla/5.0 (QNX Neutrino 6.5.0; armle) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/47.0.2497.0 Safari/537.36 Mozilla/5.0 (QNX Neutrino 6.5.0; armle) AppleWebKit/537.36 (KHTML, like Gecko) Chromium/47.0.2497.0 Safari/537.36 Mozilla/5.0 (QNX Neutrino 6.5.0; x86) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/47.0.2497.0 Safari/537.36 Mozilla/5.0 (QNX Neutrino 6.5.0; x86) AppleWebKit/537.36 (KHTML, like Gecko) Chromium/47.0.2497.0 Safari/537.36 Mozilla/5.0 (QNX Neutrino 6.6.0; armle) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/47.0.2497.0 Safari/537.36 Mozilla/5.0 (QNX TI-DRA74X-EVM) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/19.77.34.5 Mobile Safari/537.36 Mozilla/5.0 (qnx; Android 4.2.2; Z10; Build/10.2.1.155) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/34.0.1847.114 Mobile Safari/537.36 Mozilla/5.0 (qnx; Android 4.3; Z10; Build/10.3.0.168) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/34.0.1847.114 Mobile Safari/537.36 Mozilla/5.0 (QtEmbedded; QNX) AppleWebKit/534.34 (KHTML, like Gecko) Qt/4.8.0 Safari/534.34 Mozilla/5.0 (QtEmbedded; QNX) AppleWebKit/534.34 (KHTML, like Gecko) Qt/4.8.2 Safari/534.34 Mozilla/5.0 (QtEmbedded; U; QNX; C) AppleWebKit/533.3 (KHTML, like Gecko) Qt/4.7.1 Safari/533.3 Mozilla/5.0 (Unknown; N; QNX) AppleWebKit/537.21 (KHTML, like Gecko) QtTestBrowser/0.1 Safari/537.21 Mozilla/5.0 (Unknown; N; QNX) AppleWebKit/538.1 (KHTML, like Gecko) demobrowser/0.1 Safari/538.1 Mozilla/5.0 (Unknown; N; QNX) AppleWebKit/538.1 (KHTML, like Gecko) QtTestBrowser/0.1 Safari/538.1 Mozilla/5.0 (Unknown; QNX nVidia_Tegra2(T30)_Boards) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/38.0.2078.0 Safari/537.36 Mozilla/5.0 (Unknown; QNX NVIDIA_Tegra_K1_(armv7l)_Boards) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/38.0.2078.0 Safari/537.36 Mozilla/5.0 (Unknown; QNX TI-DRA74X-Delphi-Board) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/19.77.34.5 Safari/537.36 Mozilla/5.0 (Unknown; QNX TI-DRA74X-EVM) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.57 Safari/537.36 Obigo/W20.31 Mozilla/5.0 (Unknown; QNX TI-OMAP5432-uEVM) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/19.77.34.5 Safari/537.36 Mozilla/5.0 (Unknown; QNX x86pc) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/19.77.34.5 Safari/537.36 Mozilla/5.0 (Unknown; QNX x86pc) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.57 Safari/537.36 Obigo/W20.31 Mozilla/5.0 (Unknown; QNX) AppleWebKit/534.34 (KHTML, like Gecko) Arora/0.11.0 (Git: 1416 160583f) Safari/534.34 Mozilla/5.0 (Unknown; QNX) AppleWebKit/534.34 (KHTML, like Gecko) demobrowser/0.1 Safari/534.34 Mozilla/5.0 (Unknown; QNX) AppleWebKit/534.34 (KHTML, like Gecko) Qt/4.8.0 Safari/534.34 Mozilla/5.0 (Unknown; QNX) AppleWebKit/534.34 (KHTML, like Gecko) QupZilla/1.2.0 Safari/534.34 Mozilla/5.0 (Unknown; QNX) AppleWebKit/537.21 (KHTML, like Gecko) demobrowser/0.1 Safari/537.21 Mozilla/5.0 (Unknown; QNX) AppleWebKit/537.21 (KHTML, like Gecko) QtMiniBrowser/0.1 Safari/537.21 Mozilla/5.0 (Unknown; QNX) AppleWebKit/537.21 (KHTML, like Gecko) QtTestBrowser/0.1 Safari/537.21 Mozilla/5.0 (Unknown; QNX) AppleWebKit/538.1 (KHTML, like Gecko) demobrowser/0.1 Safari/538.1 Mozilla/5.0 (Unknown; QNX) AppleWebKit/538.1 (KHTML, like Gecko) QtTestBrowser/0.1 Safari/538.1 Mozilla/5.0 (Unknown; QNX) AppleWebKit/538.1 (KHTML, like Gecko) QupZilla/1.8.9 Safari/538.1 Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.224 Safari/537.36 tRQnxHFiCnvS1N0p4XQt4Et96Z8= 2014-02-20T19:36:19.251Z Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.224 Safari/537.36 BKdCJrU0RE+/ror9vqNXGUQp8Ts= 2014-04-14T03:54:09.261Z Mozilla/5.0 (Windows; U; Windows NT 5.1; de-AT; rv:1.7) Gecko/20040616; KSS2_0_99_AAAAQAbEIkwHk8zjqZDLYWm8z5IM1xdSOUcTtoBb9rmMZUhH7T2s5PuYv3l/D/kvGTUog0yC0saGRRxbYsr/XQNxSFZsN7u2PZJSkEr1FGbDZXbehBxc6DL9F5blMWSQA4dUGmqyjNke105xP9J7o7gr5LGP Mozilla/5.0 (X11; QNX TI-DRA74X-Delphi-Board) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/19.77.34.5 Safari/537.36 Mozilla/5.0 (X11; QNX TI-DRA74X-EVM) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/19.77.34.5 Safari/537.36 Mozilla/5.0 (X11; QNX TI-OMAP5432-uEVM) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/19.77.34.5 Safari/537.36 Mozilla/5.0 (X11; QNX x86pc) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/19.77.34.5 Safari/537.36 Mozilla/5.0 (X11; QNX x86pc) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2311.135 Safari/537.36 Mozilla/5.0 (X11; QNX) AppleWebKit/534.34 (KHTML, like Gecko) fancybrowser Safari/534.34 Mozilla/5.0 (X11; QNX) AppleWebKit/537.21 (KHTML, like Gecko) http://www.html5test.com Safari/537.21 Mozilla/5.0 (X11; QNX) AppleWebKit/537.21 (KHTML, like Gecko) QupZilla/1.8.6 Safari/537.21 Mozilla/5.0 (X11; QNX) AppleWebKit/537.21 (KHTML, like Gecko) webkit-demo Safari/537.21 Mozilla/5.0 (X11; U; QNX x86pc; xx; rv:1.9.2.15) Gecko/20110316 Namoroka/3.6.15 Opera/9.80 (QNX i.MX6_MIBSTD2_CPU_Board) Presto/2.12.407 Version/12.50 QNXWebClient/1.0