The file qurltlds_p.h is generated from the Public Suffix List (see [1] and [2]), by the program residing at util/corelib/qurl-generateTLDs in the Qt source tree. That program generates a character array and an index array from the list to provide fast lookups of elements within C++. Those arrays in qurltlds_p.h are derived from the Public Suffix List ([2]), which was originally provided by Jo Hermans . The file qurltlds_p.h was last generated Wednesday, February 11th 14:36 2015. ---- [1] list: http://mxr.mozilla.org/mozilla-central/source/netwerk/dns/effective_tld_names.dat?raw=1 [2] homepage: http://publicsuffix.org/