Documentation-Only IPv4 Blocks (TEST-NET & Others)
IPv4 Documentation and Training Address Ranges
Overview
Some IPv4 ranges are reserved strictly for documentation, training, textbooks, lab examples, and online tutorials. These ranges exist to prevent conflicts with real networks when publishing examples.
Users should never assign these ranges in a live environment.
What This CSV Contains
Includes:
- 192.0.2.0/24 — TEST-NET-1
- 198.51.100.0/24 — TEST-NET-2
- 203.0.113.0/24 — TEST-NET-3
- 233.252.0.0/24 — Documentation Multicast
Each entry includes:
- CIDR block
- Name
- Purpose
- Notes on proper usage
This CSV is perfect for:
- Writers
- Trainers
- Teachers
- Students
- Bloggers
- Anyone making public networking examples
| CIDR | Name | Category | Notes |
|---|---|---|---|
| 192.0.2.0/24 | TEST-NET-1 | Documentation/Examples | Reserved solely for examples, documentation, and training material. Must not be used on live networks. |
| 198.51.100.0/24 | TEST-NET-2 | Documentation/Examples | Reserved for sample configurations, books, labs, and testing tutorials. Not globally routable. |
| 203.0.113.0/24 | TEST-NET-3 | Documentation/Examples | Used in documentation in place of real-world public ranges to avoid conflicts. Not to be configured on production hosts. |
| 233.252.0.0/24 | Documentation Multicast | Multicast Documentation | Reserved multicast address range for use in documentation and example configurations; no production multicast should use this block. |