ASN & DNS Lookups in Java

Returns the ASN, owning organization, network range, and country for an IP — and whether it belongs to a datacenter. Nullable fields may be null.

IpApiClient client = IpApiClient.builder()
        .apiKey(System.getenv("IP_API_IO_KEY"))
        .build();

AsnLookup asn = client.asn("8.8.8.8");

System.out.println(asn.asn());          // 15169
System.out.println(asn.organization()); // "Google LLC"
System.out.println(asn.isDatacenter()); // true

WHOIS record for a domain: registrar, registration/expiry/update dates, name servers, status codes, and the raw WHOIS text.

Whois whois = client.whois("example.com");

if (whois.registrar() != null) {
    System.out.println(whois.registrar().name());
}
System.out.println(whois.registeredOn()); // "1995-08-14"
System.out.println(whois.nameServers());

Resolve a PTR record, resolve a hostname to addresses, or list a domain's mail servers.

var rdns = client.reverseDns("8.8.8.8");
System.out.println(rdns.hostname()); // "dns.google"

var fdns = client.forwardDns("dns.google");
fdns.addresses().forEach(record ->
    System.out.println(record.type() + " " + record.address() + " " + record.ttl())); // "A" "8.8.8.8" 300

var mx = client.mxRecords("example.com");
mx.mxRecords().forEach(record ->
    System.out.println(record.priority() + " " + record.hostname() + " " + record.ttl()));