RFC 2392 · PROPOSED STANDARD · 1998
SUN · 14 JUN 2026
Content-ID and Message-ID Uniform Resource Locators
Overview
RFC 2392, “Content-ID and Message-ID Uniform Resource Locators”, is a Proposed Standard document published in August 1998 by E. Levinson. It obsoletes RFC 2111. The canonical text is published by the RFC Editor.
Abstract
The Uniform Resource Locator (URL) schemes, "cid:" and "mid:" allow references to messages and the body parts of messages. For example, within a single multipart message, one HTML body part might include embedded references to other parts of the same message. [STANDARDS-TRACK]
What “Proposed Standard” means
An entry-level standards-track specification: stable, peer-reviewed and a solid basis for implementation, though it may still evolve before becoming an Internet Standard.
Read this RFC
The canonical text of RFC 2392 is hosted at rfc-editor.org. Available in TXT,HTML.
Relationships to other RFCs
Other RFCs from 1998
- RFC 2391 Load Sharing using IP Network Address Translation
- RFC 2393 IP Payload Compression Protocol
- RFC 2390 Inverse Address Resolution Protocol
- RFC 2394 IP Payload Compression Using DEFLATE
- RFC 2389 Feature negotiation mechanism for the File Transfer Protocol
- RFC 2395 IP Payload Compression Using LZS
- RFC 2388 Returning Values from Forms: multipart/form-data
- RFC 2396 Uniform Resource Identifiers : Generic Syntax