496 services carry this tag in their source record. Tags come from the provider, not from us — a tag is a claim about what the service does, not proof that it does it well.
Offline validator for a Romanian CUI (company tax ID). Strips an optional 'RO' prefix, applies weights 7-5-3-2-1-7-3-2 to the digits preceding the check digit (right-to-left), sums the weighted products, multiplies by 10...
Public library lookup - description, country, coordinates, founding date and website (Wikidata)
Coat-of-arms reference for a country, place, institution or family, with Wikimedia Commons asset
RFC 8705: title, authors, publication date, status (Internet Standard, Proposed Standard, Informational…), page count, what obsoletes or updates it and what it obsoletes, keywords, abstract and links to the HTML/text ver...
MIME type for .bin files: application/octet-stream. Returns the Content-Type to send, the category, whether browsers render it inline, whether it is compressible, common magic bytes and related extensions. Set headers an...
Facts about a country by name or ISO code: official name, capital, region, languages, currencies, calling code, borders, area, internet TLD, coordinates, UN membership and flag. Use to enrich addresses, forms and dataset...
Country facts: capital, currencies, languages, population, timezones, calling code — Genesis402 / UnyKorn Operator Network
Reference tables for a US tax year and filing status: income brackets, standard deduction, FICA constants, and capital-gains breakpoints. Pure lookup, not tax advice.
HTTP status troubleshooter - meaning, causes, fixes, headers and related codes for one code, a list or a search
RFC 791: title, authors, publication date, status (Internet Standard, Proposed Standard, Informational…), page count, what obsoletes or updates it and what it obsoletes, keywords, abstract and links to the HTML/text vers...
Explains HTTP headers: for each header name you give (comma-separated), what it does, typical values and an example, plus whether it is a request, response or both, and a security relevance flag. Covers 60+ common header...
MIME type reference: list all types in a category (image, audio, video, text, application, font, office), or look up a single file extension or MIME type to get its counterpart. 100+ mappings for setting Content-Type cor...
HTTP 100 Continue: what it means (the client may send the request body), what a client should do (continue sending), the class it belongs to, whether it is retryable and idempotency-safe, the defining RFC, and common cau...
HTTP 101 Switching Protocols: what it means (upgrade accepted (e.g. WebSocket)), what a client should do (switch protocol), the class it belongs to, whether it is retryable and idempotency-safe, the defining RFC, and com...
HTTP 102 Processing: what it means (WebDAV: still working), what a client should do (wait), the class it belongs to, whether it is retryable and idempotency-safe, the defining RFC, and common causes. Precise one-code ref...
HTTP 103 Early Hints: what it means (preload hints before the final response), what a client should do (start preloading), the class it belongs to, whether it is retryable and idempotency-safe, the defining RFC, and comm...
HTTP 200 OK: what it means (success), what a client should do (use the body), the class it belongs to, whether it is retryable and idempotency-safe, the defining RFC, and common causes. Precise one-code reference for err...
HTTP 201 Created: what it means (resource created; Location points at it), what a client should do (read Location), the class it belongs to, whether it is retryable and idempotency-safe, the defining RFC, and common caus...
HTTP 202 Accepted: what it means (queued for async processing), what a client should do (poll the status URL), the class it belongs to, whether it is retryable and idempotency-safe, the defining RFC, and common causes. P...
HTTP 203 Non-Authoritative Information: what it means (transformed by a proxy), what a client should do (use with care), the class it belongs to, whether it is retryable and idempotency-safe, the defining RFC, and common...
HTTP 204 No Content: what it means (success with empty body), what a client should do (nothing to parse), the class it belongs to, whether it is retryable and idempotency-safe, the defining RFC, and common causes. Precis...
HTTP 205 Reset Content: what it means (reset the form/view), what a client should do (reset UI), the class it belongs to, whether it is retryable and idempotency-safe, the defining RFC, and common causes. Precise one-cod...
HTTP 206 Partial Content: what it means (range request served), what a client should do (assemble ranges), the class it belongs to, whether it is retryable and idempotency-safe, the defining RFC, and common causes. Preci...
HTTP 207 Multi-Status: what it means (WebDAV: per-resource statuses in XML), what a client should do (parse each status), the class it belongs to, whether it is retryable and idempotency-safe, the defining RFC, and commo...