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2001:10::/28

2001:10::/28 is the Deprecated (previously ORCHID) block.

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

Short answer

IANA lists 2001:10::/28 as “Deprecated (previously ORCHID)” (RFC 4843). It is not an ordinary public address.

Block2001:10::/28
First – last2001:10:: – 2001:1f:ffff:ffff:ffff:ffff:ffff:ffff
Sizea /28 (2^100 addresses)
Name in the registryDeprecated (previously ORCHID)
Defined inRFC 4843
Allocated2007-03
Valid as source / destination— / —
Forwardable—
Globally reachable—

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Sources

  1. IANA IPv6 Special-Purpose Address Registry (CC0) · checked 2 Nov 2026
  2. RFC 4843