IPv6 ULA Address Generator

Generate random IPv6 Unique Local Addresses (ULA)

Count: 3

IPv6 ULA (Unique Local Address) — RFC 4193. Range: fc00::/7. Locally assigned addresses use prefix fd00::/8 with a 40-bit random Global ID. Not routable on the public internet.

ULA #1

/48 Prefix

fd5d:e0c2:6b1b00::/48

Example subnet addresses:

fd5d:e0c2:6b1b00:0001::1/128

fd5d:e0c2:6b1b00:0002::1/128

Address Breakdown

Prefix bytefd (0xFD — locally assigned ULA)

Global ID (40-bit random)5de0c26b1b

Subnet ID0000–FFFF (16-bit, assign per subnet)

Interface ID64-bit (assign per host)

ULA #2

/48 Prefix

fd61:7438:012a00::/48

Example subnet addresses:

fd61:7438:012a00:0001::1/128

fd61:7438:012a00:0002::1/128

Address Breakdown

Prefix bytefd (0xFD — locally assigned ULA)

Global ID (40-bit random)617438012a

Subnet ID0000–FFFF (16-bit, assign per subnet)

Interface ID64-bit (assign per host)

ULA #3

/48 Prefix

fd66:7846:934600::/48

Example subnet addresses:

fd66:7846:934600:0001::1/128

fd66:7846:934600:0002::1/128

Address Breakdown

Prefix bytefd (0xFD — locally assigned ULA)

Global ID (40-bit random)6678469346

Subnet ID0000–FFFF (16-bit, assign per subnet)

Interface ID64-bit (assign per host)

About this tool

Generate RFC 4193-compliant fd::/8 Unique Local Addresses for private IPv6 network planning. ULAs are guaranteed not to conflict with global unicast addresses.

ipv6ula本地地址rfc4193网络fd