Get the ip set of a domain as many as possible and as soon as possible.
.|-- conf # configuration dir
|
|-- nameservers.txt # DNS server list
| `-- work_nodes.txt # worker nodes list
|-- getIP_distributed.sh # multi-nodes version
|-- getIP.go # single-node version
|-- getIP.sh # single-node version
|-- job.sh
|-- LICENSE
|-- README.md
|-- result # result dir
`-- tmp # tmp dir