How to decide if internet or LAN ip?

[philkr]

I want to know my ip address for internet. I use gethostname() and then gethostbyname() with the result of the first. Now I get a list of all my IPs, but how do I know which one is the internet ip? The only way I can imagine is to check which network class the ip is. Is this a good idea, or is there a better way?

[grabbler]

but how can you classify them ?

[Mathew Joy]

One idea, you know your IP and sub-net mask. Compare the IP's net id with yours ( using mask and IP ). If it is the same you know that it belongs to your subnet. Otherwise it belongs to the outer subnet/network.

[philkr]

One idea, you know your IP and sub-net mask. Compare the IP's net id with yours ( using mask and IP ). If it is the same you know that it belongs to your subnet. Otherwise it belongs to the outer subnet/network.

Well, I know my IP but I can't hard code it because it is a multi-user program. And that is also the problem with classification of the IPs:

but how can you classify them

Normally home networks have IPs starting with at least 192. That's because of the class A network ip address range selected by ICANN. That's how I do it now. The problem is: users might not always stick to the ICANN, when selecting their LAN ip.

[Mathew Joy]

Well, I know my IP but I can't hard code it because it is a multi-user program. And that is also the problem with classification of the IPs:

Hard coding? Why do you need to hard code your IP?

See How to get the local IP address(es)? for more details..

Normally home networks have IPs starting with at least 192. That's because of the class A network ip address range selected by ICANN. That's how I do it now. The problem is: users might not always stick to the ICANN, when selecting their LAN ip.

Well, 192 IP range belongs to class C.

[philkr]

Hard coding? Why do you need to hard code your IP?

Sorry, it seems I misunderstood the first part of your post.

Well, 192 IP range belongs to class C.

Yes, that's what I meant. I got mixed up. However, thanks for the link, I will rate it.

[Mathew Joy]

However, thanks for the link, I will rate it.

You don't have to mention it...rating is up to the individual to. Rating or no rating...we are here to help.

[ting88]

you can get your IP Address details, through this site http://www.ip-details.com/ip-search/
It has the best result about internet service provider,location, country and and also provides the IP details at free cost itself.......