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Difficulty: EasyIPv6 Addressing and Prefixes

Match each IPv6 address type on the left with its corresponding reserved prefix range on the right. Which pairs correctly match each IPv6 address scope to its standard IPv6 prefix?

  • Global Unicast Address2000::/3
  • Link-Local Addressfe80::/10
  • Unique Local Addressfc00::/7
  • Multicast Addressff00::/8

Answer

Global Unicast Address pairs with 2000::/3, Link-Local Address pairs with fe80::/10, Unique Local Address pairs with fc00::/7, and Multicast Address pairs with ff00::/8.
Each standard IPv6 address scope is assigned a dedicated prefix block by IANA and RFC 4291: Global Unicast uses 2000::/3 for public Internet traffic, Link-Local uses fe80::/10 for interface communication on the same link, Unique Local uses fc00::/7 for internal site routing, and Multicast uses ff00::/8 for group delivery.

Step-by-Step Solution

1
Identify the reserved prefix block for IPv6 Global Unicast addresses.
Global Unicast Address maps to 2000::/3.
Global Unicast IPv6 addresses are defined by RFC 4291 as starting in the 2000::/3 prefix range (2000:: through 3FFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF).
2
Identify the reserved prefix block for IPv6 Link-Local addresses.
Link-Local Address maps to fe80::/10.
IPv6 link-local addresses use the prefix fe80::/10, which covers fe80:: through febf:ffff:ffff:ffff:ffff:ffff:ffff:ffff.
3
Identify the reserved prefix block for IPv6 Unique Local addresses (ULA).
Unique Local Address maps to fc00::/7.
Unique Local IPv6 addresses are analogous to IPv4 private addresses and start with the fc00::/7 block (fc00:: through fdff:ffff:ffff:ffff:ffff:ffff:ffff:ffff).
4
Identify the reserved prefix block for IPv6 Multicast addresses.
Multicast Address maps to ff00::/8.
All IPv6 multicast addresses begin with the prefix byte ff00::/8.

Key Concept

IPv6 Address Types and Reserved Prefixes
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Topics

IPv6 Addressing and Prefixes

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