do the ISP's tell you how many internal IP addresses you can have?

Churla27 · 11-03-2011, 05:43 PM

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.

~Darkseeker~ · 11-03-2011, 06:37 PM

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.

Churla27 · 11-03-2011, 06:53 PM

OK cool. I was always wondering how it worked. Thanks!

**root** · 11-07-2011, 06:14 AM

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

11-03-2011, 05:43 PM	#1
Churla27 Baseband Member Join Date: Nov 2010 Posts: 58	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.

11-03-2011, 06:37 PM	#2
~Darkseeker~ Fully Optimized Join Date: Jan 2010 Location: United Kingdom Posts: 1,964	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. __________________ "Democracy is the road to Socialism" - Karl Marx

11-03-2011, 06:53 PM	#3
Churla27 Baseband Member Join Date: Nov 2010 Posts: 58	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!

11-07-2011, 06:14 AM	#4
root Site Team Join Date: Mar 2004 Posts: 6,939	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. __________________ I didn’t fight my way to the top of the food chain to be a vegetarian… Im sick of people saying 'dont waste paper'. If trees wanted to live, they'd all carry guns. "The inherent vice of capitalism is the unequal sharing of blessings; The inherent vice of socialism is the equal sharing of miseries."

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