Field41 is a curated web index maintained as an open reference resource. The catalogue currently holds 831 entries organized across 22 subject sections, each representing a distinct area of online activity — from financial services and medical providers to travel operators and technology firms. The purpose of Field41 is straightforward: to provide a structured, browsable index of web resources that can serve as a starting point for research, discovery, or comparison. Unlike algorithmic search results, a curated index reflects deliberate selection — each entry has been individually reviewed before being assigned to the appropriate section. The 22 sections in Field41 range from large, broadly populated shelves (such as General Holdings, with nearly 190 entries) to more selective sections (such as Property & Land, with 5 carefully chosen entries). This variation reflects the natural distribution of online resources across subjects rather than any editorial preference for scale. Field41 welcomes submissions from site owners who wish to have their resource catalogued. There is no charge for inclusion. The curator reviews all submissions and assigns each accepted entry to the section that most accurately reflects its subject matter. The index is updated as new submissions are reviewed and approved. Field41 does not guarantee inclusion for any submitted site, and reserves the right to decline entries that do not meet the catalogue's basic standards for clarity and scope.