pyasn1-modules
A collection of ASN.1-based protocols modules
Decision gist · record as of 2026-08-14
Yes, for stable use cases involving standard ASN.1 protocols. The package is production-ready, carries no security vulnerabilities, has low install friction, and supports modern Python versions. The aging maintenance status (504 days since last release) is not a blocker for applications using established ASN.1 modules, but it signals that new module additions or rapid feature work should not be expected. Install if you need pre-built ASN.1 structures for known standards; avoid if you require active development.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python 3.8 or later; depends on pyasn1 being installed and compatible.
- Low install friction with a single pure-Python dependency (pyasn1).
- Maintenance status is aging—last release was 504 days ago, though the repository remains active with a commit as recent as 2025-05-09.
License · maintenance · safety
BSD (permissive) — BSD license (permissive) allows commercial and private use with minimal restrictions. No licensing barrier to adoption.
last release 2025-03-28 (504 days) · last repo commit 2025-05-09 · 9 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 462,465,610 downloads/mo, #87 on PyPI
Alternatives
Verify before relying
pip install pyasn1-modules
from pyasn1_modules import rfc
# Use ASN.1 structures from standard RFCs- Which specific ASN.1 modules (RFCs, standards) are included in version 0.4.2 and how complete their coverage is.
- Performance characteristics or limitations when handling large or deeply nested ASN.1 structures.
- Whether the package is actively accepting new module contributions or in maintenance-only mode.
- Specific use cases for X.509 certificates, SNMP messages, or other protocol support.
What it is and what it does
pyasn1-modules is a collection of pre-built ASN.1 data structures for Python, designed to work with the pyasn1 library. It provides ready-to-use Python classes representing ASN.1 definitions from standards and RFCs, eliminating the need to manually define these structures for common protocols and data formats. The package is particularly useful for applications that need to parse, validate, or generate data in ASN.1-encoded formats.
The package has been in production use since its first release in 2011 and maintains broad Python version support (3.8 through 3.13, including PyPy). It carries a permissive BSD license and has no known security vulnerabilities. However, maintenance is aging: the last release was 504 days ago, and the project has low GitHub visibility (9 stars). It remains suitable for stable, standards-based use cases where the ASN.1 modules you need are already present in the collection.
Use it for
- Work with ASN.1-encoded data in security and cryptographic applications.
- Parse and validate structures defined in standard ASN.1 protocols.
- Encode and decode ASN.1 structures in telecommunications and signaling protocols.
- Build applications that need to handle standardized ASN.1 data formats.
- Integrate ASN.1 module definitions into compliance tooling without manual schema definition.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes, for stable use cases involving standard ASN.1 protocols.
The package is production-ready, carries no security vulnerabilities, has low install friction, and supports modern Python versions. The aging maintenance status (504 days since last release) is not a blocker for applications using established ASN.1 modules, but it signals that new module additions or rapid feature work should not be expected. Install if you need pre-built ASN.1 structures for known standards; avoid if you require active development.
Install
pyasn1-modules on PyPI
Before you install
Low install friction with a single pure-Python dependency (pyasn1). Maintenance status is aging—last release was 504 days ago, though the repository remains active with a commit as recent as 2025-05-09. Suitable for stable, established use cases rather than rapid feature development.
Requires Python 3.8 or later; depends on pyasn1 being installed and compatible.
License in practice
BSD license (permissive) allows commercial and private use with minimal restrictions. No licensing barrier to adoption.
Quickstart
pip install pyasn1-modules
from pyasn1_modules import rfc
# Use ASN.1 structures from standard RFCsVerify before relying
- Which specific ASN.1 modules (RFCs, standards) are included in version 0.4.2 and how complete their coverage is.
- Performance characteristics or limitations when handling large or deeply nested ASN.1 structures.
- Whether the package is actively accepting new module contributions or in maintenance-only mode.
- Specific use cases for X.509 certificates, SNMP messages, or other protocol support.
Package facts
| License | BSD permissive |
| Python support | Supports the current Python release >=3.8 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | 1 packagepyasn1 |
| Maintenance | Aging 504 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 462,465,610 / month, #87 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Development Status :: 5 - Production/StableEnvironment :: ConsoleIntended Audience :: DevelopersIntended Audience :: EducationIntended Audience :: Information TechnologyIntended Audience :: System AdministratorsIntended Audience :: Telecommunications IndustryLicense :: OSI Approved :: BSD LicenseNatural Language :: EnglishOperating System :: OS IndependentProgramming Language :: Python :: 3Programming Language :: Python :: 3.10Programming Language :: Python :: 3.11Programming Language :: Python :: 3.12Programming Language :: Python :: 3.13Programming Language :: Python :: 3.8Programming Language :: Python :: 3.9Programming Language :: Python :: Implementation :: CPythonProgramming Language :: Python :: Implementation :: PyPyTopic :: CommunicationsTopic :: Software Development :: Libraries :: Python Modules |
Evidence: pyasn1_modules-0.4.2-py3-none-any.whl
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