Quiz Entry - updated: 2026.07.14
What are the three types of IPv6 unicast addresses?
Global Unicast (GUA, 2000::/3 — Internet-routable), Link-Local (LLA, fe80::/10 — single link only), and Unique Local (fc00::/7 — private to an organization).
Three Types of IPv6 Unicast Addresses:
| Type | Range | Scope | Purpose |
|---|---|---|---|
| Global Unicast (GUA) | 2000::/3 (starts with 2 or 3) | Internet | Public, routable addresses |
| Link-Local (LLA) | fe80::/10 | Local link only | Communication on local segment |
| Unique Local | fc00::/7 (fd00::/8 used) | Organization | Private, not routable on Internet |
Global Unicast Address (GUA):
- Similar to IPv4 public addresses
- Globally unique and routable
- IANA assigns global unicast addresses from 2000::/3 (first three bits 001), which is 1/8 of the total IPv6 space
Link-Local Address (LLA):
- Required on every IPv6-enabled interface
- Not routable beyond local link
- Used for: neighbor discovery, default gateway
- Automatically generated or manually configured
Unique Local Address:
- Similar to IPv4 RFC 1918 private addresses
- Range: fc00::/7 (typically fd00::/8)
- Not routable on global Internet
- Used for local communication within an organization
Go deeper:
IPv6 Address Types (NetworkAcademy.IO) — a free CCNA-level walkthrough of GUA, link-local and unique-local with prefixes and scope.- IPv6 address — unicast (Wikipedia) — the 2000::/3, fe80::/10 and fc00::/7 ranges and what each is for.