
856 Ship Notice/Manifest
AT&T’s published 856 specification, rendered as an interactive guide. Expand any segment to see its elements, data types, lengths and accepted codes — then validate your own document against it below.
Specification
Validate a 856
Paste or upload a document and check it against AT&T’s published rules — segment order and repetition, required elements, field lengths, data types and accepted codes. Nothing is stored.
Go live on AT&T’s 856 in days, not months
Weredi maps this guide to your ERP, runs the test cycle with AT&T, and keeps the spec current as it changes.