### Узнать IP адреса домена
```bash
host vk.com
```
ответ, что-то типа
```
vk.com has address 87.240.137.158
vk.com has address 87.240.139.194
vk.com has address 93.186.225.208
vk.com has address 87.240.190.78
vk.com has address 87.240.190.72
vk.com has address 87.240.190.67
vk.com mail is handled by 0 mx.vk.com.
vk.com mail is handled by 20 mx2.vk.com.
```