RFC 2511 · PROPOSED STANDARD · 1999
SUN · 14 JUN 2026
Internet X.509 Certificate Request Message Format
Overview
RFC 2511, “Internet X.509 Certificate Request Message Format”, is a Proposed Standard document published in March 1999 by M. Myers, C. Adams, D. Solo, D. Kemp. It has been obsoleted by RFC 4211 — refer to the newer document for the authoritative version. The canonical text is published by the RFC Editor.
Abstract
This document describes the Certificate Request Message Format (CRMF). [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 2511 is hosted at rfc-editor.org. Available in TXT,HTML.
Relationships to other RFCs
Other RFCs from 1999
- RFC 2510 Internet X.509 Public Key Infrastructure Certificate Management Protocols
- RFC 2512 Accounting Information for ATM Networks
- RFC 2509 IP Header Compression over PPP
- RFC 2513 Managed Objects for Controlling the Collection and Storage of Accounting Information for Connection-Oriented Networks
- RFC 2508 Compressing IP/UDP/RTP Headers for Low-Speed Serial Links
- RFC 2514 Definitions of Textual Conventions and OBJECT-IDENTITIES for ATM Management
- RFC 2507 IP Header Compression
- RFC 2515 Definitions of Managed Objects for ATM Management