Happy Eyeballs

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Concurrent DNS lookups for A and AAAA records for one or more hosts.

Usage

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>> bin/dns [-s namesever] host[s]

Build and Run

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>> make
>> bin/dns facebook.com google.com ietf.org
using nameserver: 8.8.8.8

facebook.com
66.220.149.11
66.220.158.11
69.171.229.11
69.171.242.11
2a03:2880:10:1f02:face:b00c::25
2a03:2880:10:8f01:face:b00c::25
2a03:2880:2110:3f01:face:b00c::

google.com
173.194.69.138
173.194.69.101
173.194.69.100
173.194.69.102
173.194.69.113
173.194.69.139

ietf.org
12.22.58.30
2001:1890:123a::1:1e