GS1 Digital Link Resolver (id.gs1.org)
GS1 AISBL's own live, unauthenticated GS1-Conformant Resolver, implementing the GS1-Conformant Resolver Standard 1.2.0. It takes a GS1 Digital Link URI built from a GS1 identification key and returns either a 303 redirect to the brand owner's target resource or, on request, an RFC 9264 linkset enumerating every registered link type for that key. The resolver description document at /.well-known/gs1resolver declares the supported primary keys — 00 (SSCC), 01 (GTIN), 253 (GDTI), 255 (GCN), 401 (GINC), 402 (GSIN), 414/415/417 (GLN), 8003 (GRAI), 8004 (GIAI), 8006 (ITIP), 8010 (CPID), 8013 (GMN) and 8017/8018 (GSRN) — which includes the consignment and shipment keys logistics parties actually quote. No key, no signup and no contract is required to call it.