Question 1

How to store custom data with CIDR blocks in cidranger?

Accepted Answer

Create a struct that implements the RangerEntry interface, adding your fields and defining the Network() method to return the net.IPNet. For example, you could attach a string label for cloud provider identification.

Question 2

Cidranger or brute-force for checking IPs in small lists?

Accepted Answer

For small, static datasets, brute-force might be simpler and sufficient; cidranger's trie setup adds overhead best justified for large ranges like AWS IPs, where speed gains are significant.

Question 3

What's the performance impact with millions of CIDR entries?

Accepted Answer

Path compression keeps lookups fast, but memory usage scales with trie complexity; benchmarks with AWS ranges show efficiency, but test with your dataset for exact metrics.

Question 4

How to handle IPv4 and IPv6 together in cidranger?

Accepted Answer

Use the same ranger instance for both; methods like Contains() accept net.IP, so parse IPv4 or IPv6 addresses directly, and the trie manages them internally without separate structures.

Question 5

Does cidranger support thread-safe concurrent operations?

Accepted Answer

The library doesn't guarantee concurrency; you'll need to add synchronization like mutexes if using it in multi-goroutine environments, as the README doesn't address this explicitly.

Question 6

Cidranger vs other Go IP lookup libraries?

Accepted Answer

Cidranger excels in raw speed and memory efficiency for containment checks, but alternatives might offer more features like CIDR manipulation or integration with HTTP routers; choose based on your specific needs.

cidranger

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