RFC 2152 · INFORMATIONAL · 1997

UTF-7 A Mail-Safe Transformation Format of Unicode

Overview

RFC 2152, “UTF-7 A Mail-Safe Transformation Format of Unicode”, is an Informational document published in May 1997 by D. Goldsmith, M. Davis. It obsoletes RFC 1642. The canonical text is published by the RFC Editor.

Abstract

This document describes a transformation format of Unicode that contains only 7-bit ASCII octets and is intended to be readable by humans in the limiting case that the document consists of characters from the US-ASCII repertoire. It also specifies how this transformation format is used in the context of MIME and RFC 1641, "Using Unicode with MIME". This memo provides information for the Internet community. This memo does not specify an Internet standard of any kind.

Abstract as published in the RFC, via rfc-editor.org.

What “Informational” means

Published for the general information of the community. It does not define an IETF standard and carries no standards-track status.

Read this RFC

The canonical text of RFC 2152 is hosted at rfc-editor.org. Available in TXT,HTML.

Relationships to other RFCs
This RFC obsoletes
RFC 1642
Other RFCs from 1997

Who Is Online

In total there are 58 users online: 0 registered, 50 guests and 8 bots.

Most users ever online was 1,226 on 13 Jun 2026, 3:56 am.

Bots: AhrefsBot Applebot Bingbot Googlebot Majestic Other Bot SemrushBot Sogou

Users active in the past 15 minutes. Total registered members: 354