Obtaining a server IP address from hostname

Question

When performing an NSURLRequest to a hostname, is it possible to obtain the IP address of the server that the response came from?

The NSURL method:

- (NSString *)host;

simply returns the hostname, and I see no way of obtaining the IP address from any of the other NSURL methods.

Perhaps there is a way of performing a host lookup before inititing the NSURLRequest?

Answer 1

You can use the system call gethostbyname() to resolve a hostname then use the returning structure to get the ip address. Have a look at inet_ntop() for this last part.

EXAMPLE CODE

struct hostent *hostentry;
hostentry = gethostbyname("google.com");
char * ipbuf;
ipbuf = inet_ntoa(*((struct in_addr *)hostentry->h_addr_list[0]));
printf("%s",ipbuf);

Answer 2

I was asking a question regarding

"how to get IP from hostname in unix\linux?"

but found this question in a different context which is not for Unix I guess, let me correct if I am wrong

since this question already been asked so I am fearing to avoid asking the same question marked as duplicated by stack overflow team.

Quest: how to get IP from hostname in unix\linux?

Ans: the two commands over there

1. ping host_name

Ex:

ping -s google.co.in
PING google.co.in: 56 data bytes
64 bytes from dfw06s48-in-f3.1e100.net (216.58.194.99): icmp_seq=0. time=2.477 ms
64 bytes from dfw06s48-in-f3.1e100.net (216.58.194.99): icmp_seq=1. time=1.415 ms
64 bytes from dfw06s48-in-f3.1e100.net (216.58.194.99): icmp_seq=2. time=1.712 ms

2. nslookup host_name

Ex:

nslookup google.co.in
Server:         155.179.59.249
Address:        155.179.59.249#53

Non-authoritative answer:
Name:   google.co.in
Address: 216.58.194.99