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I am trying to use the no-IP service to get a domain name for my dynamic ip address. I use some tools on line to detect my IP, and they tell me that my IP address is 88.207.251.1. So I bind this IP with a domain name at this website.

But to my surprise, it changes automatically!

I mean, when I try to ping my domain name, it becomes this ip: 

10.244.149.239

And I go to that website to check my domain name and i find that that IP changes into 10.244.149.239.

I really dont know why.

Besides, I enter into my router and the router tells me that its IP address is 10.244.149.239.

I don’t understand. The inner IP of the router—an AVM FRITZ!Box 7490—should be something like 192.168.1.1? Because to enter into the router, I type 192.168.1.1 at the Internet Explorer.

  • If the 10.244.149.239 is outer ip, what is 88.207.251.1?
  • If the 10.244.149.239 is inner ip, what is 192.168.1.1?
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    You have double NAT. Your dynamic IP address is also private, so you can't map a domain name to it and accept incoming connections. What is your router connected to exactly?
    – David Schwartz
    Apr 3, 2015 at 15:32
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    Or, more generally: Please name your ISP and data plan.
    – Daniel B
    Apr 3, 2015 at 15:36
  • @DavidSchwartz my router is "FRITZ!Box 7490"
    – Yves
    Apr 3, 2015 at 15:41
  • @DanielB my router is "FRITZ!Box 7490"
    – Yves
    Apr 3, 2015 at 15:41
  • This is essentially the same question as superuser.com/questions/897382/…
    – Tetsujin
    Apr 3, 2015 at 16:24

1 Answer 1

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10.X.X.X is a Class A private network IP range. All values in here are always on a private network. Some routers utilize 192.168.X.X, a Class C private network IP range. You should always see one of these ranges as your "default gateway," unless you're directly connected to the internet. Most providers today are using NATs unless you request a static IP address. This means that your IP of 88.207.251.1 is probably shared with other "Entreprise des P&T" customers on your local node (possibly your neighborhood or city).

Using NAT allows service providers to provide many more customers service than they could using only their allocated IP addresses. Since the IPv4 space has been completely exhausted, such tricks are necessary to keep the Internet going while everyone upgrades to IPv6. Contact your service provider if you want a dedicated IP address, and expect to pay more for the service.

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