🌐 IPv6 ULA Generator
Generate RFC 4193 compliant IPv6 Unique Local Addresses for private networks. Create ULA addresses using MAC address or timestamp.
⌨️ MAC Address Input
💡 Tip: MAC Address is optional, if not provided, current timestamp will be used for generation. Supports format:
20:37:06:12:34:56 | 20-37-06-12-34-56 | 2037.0612.3456
📚 Reference Table
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💡 IPv6 ULA Instructions: Unique Local Address (ULA) is a private address for local networks in IPv6, similar to IPv4 private address ranges (192.168.x.x).
Format Instructions Example
ULA Prefix Fixed fd prefix, 40-bit global ID fdXX:XXXX:XXXX
/48 Network Complete ULA network prefix fd12:3456:789a::/48
/64 Subnet First routable subnet fd12:3456:789a:0::/64
Last /64 Last routable subnet fd12:3456:789a:ffff::/64
📝 Generation algorithm (RFC 4193):
Global ID = Lower 40 bits of SHA1(Timestamp + MAC)
ULA = fd + Global ID + Subnet + Interface
🔍 Use Scenarios:
• Local network device identification
• Private service communication
• Avoid conflicts with public IPv6 addresses
• Routable local network (non-NAT)