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This Rust library can be used to look up IP address for matching ASN record that contains: * network base IP address and mask (e.g. ipnet::Ipv4Net value like 1.1.1.0/24), * assigned AS number (e.g. 13335), * owner country code (e.g. "US"), * owner information (e.g. "CLOUDFLARENET - Cloudflare, Inc.").

This crate requires data file ip2asn-v4.tsv from IPtoASN and only supports IP v4 addresses (PR for v6 is welcome).

Example

Load database from ip2asn-v4.tsv file and look up 1.1.1.1 IP address.

```rust use asn_db::Db; use std::fs::File; use std::io::BufReader;

let db = Db::form_tsv(BufReader::new(File::open("ip2asn-v4.tsv").unwrap())).unwrap(); let record = db.lookup("1.1.1.1".parse().unwrap()).unwrap();

println!("{:#?}", record); println!("{:#?}", record.network()); ```

This prints: noformat Record { ip: 16843008, prefix_len: 24, as_number: 13335, country: "US", owner: "CLOUDFLARENET - Cloudflare, Inc." } 1.1.1.0/24

Note that this library also provides methods of storing the database in binary format for quicker load times.

See documentation for details at docs.rs.