IPIP Address Lookup
IPv6loopback

::1

IPv6 Loopback address • Managed by IETF Reserved (RFC 4291)

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

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Overview of ::1

::1 is the 128-bit IPv6 loopback interface address (equivalent to 127.0.0.1 in IPv4). It directs local network packets back into the local operating system socket stack.

Classification & Technical Details

  • Protocol Version: IPv6

  • Address Classification: LOOPBACK (Non-routable / Local Interface)

  • Managing Authority / Registry: IETF Reserved (RFC 4291)

  • Authoritative Reverse DNS (PTR): localhost

Routing and Operational Purpose

The IP ::1 is designated for IPv6 Loopback address. 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.