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Old 11-03-2011, 06:43 PM   #1
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Default do the ISP's tell you how many internal IP addresses you can have?

Do ISP's make that decision or is it up to the admins? Could you use class A IP addresses if you wanted to internally? How does that work? Any input works. Thanks.
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Old 11-03-2011, 07:37 PM   #2
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Default Re: do the ISP's tell you how many internal IP addresses you can have?

How you set up your internal network is up to you. Your ISP provide the line and the router's public IP - and that's their point of demarcation.

If you set up your internal network in class A (10.x.y.z) you can have exponentially more hosts (16,777,216 or 2^24) because you sacrifice subnets for host bits. Class C network addressing limits you to 254 hosts per subnet, but gives a higher number of subnets with 254 hosts per subnet. Your ISP can't control how you set up your network internally, unless it specifically says so in your service agreement.
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Old 11-03-2011, 07:53 PM   #3
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Default Re: do the ISP's tell you how many internal IP addresses you can have?

OK cool. I was always wondering how it worked. Thanks!
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Old 11-07-2011, 07:14 AM   #4
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Default Re: do the ISP's tell you how many internal IP addresses you can have?

you can also supernet class C subnets if you need more than 256 addresses.
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