getaddrinfo resolves hostname incorrectly - c++

Question

I try to use getaddrinfo function (http://man7.org/linux/man-pages/man3/getaddrinfo.3.html) to get in_addr structure of IP address, but as far as I see, something is wrong, or I do something wrong. Consider following code snippet.
bool resolve_host (string hostname, in_addr* address) {
cout << "hostname = " << hostname << endl;
addrinfo *res {};
addrinfo hints {0, AF_INET, 0, 0, 0, nullptr, nullptr, nullptr};
auto result = getaddrinfo (hostname.c_str (), nullptr, &hints, &res);
if (!result) {
memcpy (address, &((struct sockaddr_in*) res->ai_addr)->sin_addr, sizeof (in_addr));
freeaddrinfo (res);
cout << "resolved addr = " << inet_ntoa (*address) << endl << endl;
return true;
}
else {
return false;
}
}
With the usage like this:
in_addr addr {};
resolve_host ("www.google.pl", &addr); // 1
resolve_host ("linux-1smb", &addr); // 2
resolve_host ("192.168.100.100", &addr); // 3
resolve_host ("192.168.100.1001", &addr); // 4
resolve_host ("wrong_name", &addr); // 5
Output looks like this:
hostname = www.google.pl
resolved addr = 74.125.71.94
hostname = linux-1smb
resolved addr = 192.168.0.101
hostname = 192.168.100.100
resolved addr = 192.168.100.100
hostname = 192.168.100.1001
hostname = wrong_name
resolved addr = 217.74.65.145
First four calls acts like intended. There is of course an assumption that linux-1smb is a known hostname (added to /etc/hosts). But the last (5) call shows that hostname "wrong_name" (which of course is not added to /etc/hosts) has an IP address 217.74.65.145.
Could you tell me where do I have a mistake (in code, or understanding how getaddrinfo works)?
Content of the /etc/hosts is:
#
# hosts This file describes a number of hostname-to-address
# mappings for the TCP/IP subsystem. It is mostly
# used at boot time, when no name servers are running.
# On small systems, this file can be used instead of a
# "named" name server.
# Syntax:
#
# IP-Address Full-Qualified-Hostname Short-Hostname
#
127.0.0.1 localhost
# special IPv6 addresses
::1 localhost ipv6-localhost ipv6-loopback
fe00::0 ipv6-localnet
ff00::0 ipv6-mcastprefix
ff02::1 ipv6-allnodes
ff02::2 ipv6-allrouters
ff02::3 ipv6-allhosts
192.168.0.101 linux-1smb
225.0.0.37 multi-test
What's worth to be mentioned is, if I change hints, to this:
addrinfo hints {0, AF_UNSPEC, 0, 0, 0, nullptr, nullptr, nullptr};
which is (as far as I know - from documentation) equals to:
getaddrinfo (hostname.c_str (), nullptr, nullptr, &res);
The result of fourth call is:
hostname = 192.168.100.1001
resolved addr = 217.74.65.145
Which is the same IP address like in case of call 5.
Possible solution:
I read in the comment some possible situation and I checked it. It turns out, that the address 217.74.65.145 is an address of my ISP, which basically forwards all unknown hostnames (from browser for example) into this address. I think, that's the reason why getaddrinfo returns this address. I still don't know how to solve this, but now I now why this happens.
Thanks