ตรวจสอบ DNS Record, Host IP ด้วย PHP เอามาจากปรั่งทำไว้ตามเคยครับ ^^
- checkdnsrr() – Check if DNS records exists corresponding to a given Internet host name or IP address
- dns_get_record() – Fetch DNS Resource Records associated with a hostname
- getmxrr() – Get MX records corresponding to a given Internet host name
- gethostbyaddr() – Get the Internet host name corresponding to a given IP address
- gethostbyname() – Get the IPv4 address corresponding to a given Internet host name
- gethostbynamel() – Get a list of IPv4 addresses corresponding to a given Internet host name
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