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IPv4reserved

203.0.113.1

RFC 5737 TEST-NET-3 documentation block • Managed by IETF Documentation (TEST-NET-3, RFC 5737)

Profile updated: November 2026•Verified against IANA & RIR database allocations

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Overview of 203.0.113.1

203.0.113.1 is part of the third RFC 5737 block dedicated to networking guides, code examples, and test cases.

Classification & Technical Details

  • Protocol Version: IPv4
  • Address Classification: RESERVED (Non-routable / Local Interface)
  • Managing Authority / Registry: IETF Documentation (TEST-NET-3, RFC 5737)

Routing and Operational Purpose

The IP 203.0.113.1 is designated for RFC 5737 TEST-NET-3 documentation block. In modern networking, proper identification of such infrastructure nodes is essential for diagnosing traceroute latency, verifying forward-confirmed reverse DNS (FCrDNS), and establishing trustworthy security policies.