Classify IPv6 address types by prefix.
Choose the range reserved for ordinary global unicast.
Which prefix is global unicast?
2000::/3 is the range reserved for IPv6 global unicast. Actual assignment and reachability still depend on routing and operations.
Detailed explanation
::1/128Incorrect. ::1/128 is loopback.
Incorrect. ::1/128 is loopback.
fc00::/7Incorrect. fc00::/7 is unique-local unicast.
Incorrect. fc00::/7 is unique-local unicast.
fe80::/10Incorrect. fe80::/10 is link-local unicast.
Incorrect. fe80::/10 is link-local unicast.
2000::/3Correct. 2000::/3 is the global-unicast range.
Correct. 2000::/3 is the global-unicast range.
Try it yourself
An example you can run in a temporary verification environment.
python3 -c "import ipaddress; print(ipaddress.ip_address('2001:db8::1') in ipaddress.ip_network('2000::/3'))"Expected result
TrueKey points
- 2000::/3
- fc00::/7 is unique-local
- fe80::/10 is link-local
Notes
- Environment: Python 3 ipaddress / 外部通信なし
- Command output formatting can vary slightly by distribution or tool version.
- Run the example in a temporary directory or process when possible.
Foundation review
Read the scope first
Check whether the command acts on the current shell, a new process, an existing process, or a file.
Verify the observable result
Use the supplied command and compare the output with the expected result.