Hi Shekar, Have you tried `java.net.preferIPv6Addresses` [1]? Setting that property to `true` should result in IPv6 addresses, if there are any, being returned before IPv4 addresses.
-Chris. [1] https://docs.oracle.com/javase/10/docs/api/java/net/doc-files/net-properties.html#Ipv4IPv6 > On 21 Aug 2018, at 18:21, S, Chandra Shekar (CDI R&D) > <chandra-sheka...@hpe.com> wrote: > > Hello Experts, > > This is regarding the Enhancement request for a new method to give IPv6 > address for the given host name. > Currently we have a method InetAddress.getByName > <https://docs.oracle.com/javase/7/docs/api/java/net/InetAddress.html#getByName(java.lang.String)>(String > <https://docs.oracle.com/javase/7/docs/api/java/lang/String.html> host) to > give the IPAddress for the given hostname. > > If the DNS server resolves to both IPv4 and IPv6 addresses for the given > hostname, this method will return only the first IPv4 address. > Actually this method queries the DNS server first for the IPv4 addresses (ie, > with option -query=A) and then queries the DNS server for the IPv6 (ie, with > option -query=AAAA) addresses. > It consolidates the both IPv4 address and IPv6 address into the list, and > returns the first address from the consolidate list. As the IPv4 address will > be the first in the list , it always returns the IPv4 address only. > > If we need to get only IPv6 address for the given host name (especially in > the IPv6Only environments), currently there is no such method/api for this. > Currently we have method InetAddress.getAllByName > <https://docs.oracle.com/javase/7/docs/api/java/net/InetAddress.html#getAllByName(java.lang.String)>(String > <https://docs.oracle.com/javase/7/docs/api/java/lang/String.html> host), > which gives both IPv4 address and IPv6 address list, by iterating this we > can get the IPv6 address resolution. > But it is nice to have a separate method to get/resolve to IPv6address. Ex : > getIPv6AddressByName(String > <https://docs.oracle.com/javase/7/docs/api/java/lang/String.html> host) or > getByName > <https://docs.oracle.com/javase/7/docs/api/java/net/InetAddress.html#getByName(java.lang.String)>(String > <https://docs.oracle.com/javase/7/docs/api/java/lang/String.html> host, > AddressType addressType) – addressType will be passed by the call get > IPv4/IPv6 address. > This new method can query the DNS only for the IPv6 address (ie, with option > -query=AAAA) which will have performance improvement over other. > > Thanks & Regards > Shekar
