IPv6 ULA Generator
Generate RFC 4193-compliant IPv6 Unique Local Address prefixes with random or custom Global IDs, plus example addresses.
How to use IPv6 ULA Generator
- Choose random or custom prefix mode.
- Click Generate to create a new ULA prefix.
- Optionally set a subnet ID and generate example addresses.
What is IPv6 ULA Generator?
An IPv6 ULA generator creates Unique Local Address prefixes (fc00::/7 range, typically fd00::/8) for private networks. ULAs are the IPv6 equivalent of RFC 1918 private IPv4 ranges.
The 40-bit Global ID is randomly generated using the Web Crypto API for cryptographic quality randomness, following RFC 4193 recommendations.
FAQ
- What is a ULA address?
- ULA (Unique Local Address) is an IPv6 address range (fd00::/8) for private use, similar to 192.168.x.x in IPv4.
- Should I use ULA or GUA for my network?
- ULA is for internal-only networks. For internet-facing services, use GUA (Global Unicast Addresses) assigned by your ISP.
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