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2001:2::/48

2001

Last updated 2 Nov 2026 from the IANA IPv6 Special-Purpose Address Registry

Short answer

2001:2::/48 is reserved for benchmarking IPv6 equipment.

Block2001:2::/48
First – last2001:2:: – 2001:2:0:ffff:ffff:ffff:ffff:ffff
Sizea /48 (2^80 addresses)
Name in the registryBenchmarking
Defined inRFC 5180; RFC Errata 1752
Allocated2008-04
Valid as source / destinationTrue / True
ForwardableTrue
Globally reachableFalse

What it means

RFC 5180 reserves it for lab testing, the IPv6 counterpart of 198.18.0.0/15.

It is not routed on the internet.

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Sources

  1. IANA IPv6 Special-Purpose Address Registry (CC0) · checked 2 Nov 2026
  2. RFC 5180; RFC Errata 1752