dns_get_record query failed

Question

I was trying to create a DNS availability checker, and while testing dns_get_record(), some of the results failed.

My code is something like this:

Answer 1

It looks like the specified "official" dns servers for that domain are offline. A whois on the domain gives:

Record expires on 12-Apr-2012.
Record created on 13-Apr-1998.
Database last updated on 25-Jan-2012 13:20:24 EST.

Domain servers in listed order:

NS1.DONGMUN.NET              147.46.147.28
NS2.DONGMUN.NET              147.46.147.29

and directly querying either of the specified name servers returns failure - they're not pingable either, so there's no official DNS servers available to respond to queries on that domain. Hence your error.