ARIN IP assignments

[rtjensen4]

Hello,

I am a bit confused with how ARIN assignments work. I've never had to deal with it before, so i'm looking for some clarification.

I've read in ARIN's policies that to end-users, they will only assign a /20, a /22 to dual-homed customers. However, I've heard people mention getting smaller blocks from ARIN, like /24. How is this possible? Or is it even possible?

We're currently using 4 discontiguous /28 networks from our ISP, I'd like to get an ASN, purchase an address space and become dual-homed, but I'm not certain we can meet the utilization requirements for a /22, but we definately could for a /24.

Here is the regulation:

4.3.3. Utilization rate

Utilization rate of address space is a key factor in justifying a new assignment of IP address space. Requesters must show exactly how previous address assignments have been utilized and must provide appropriate details to verify their one-year growth projection. The basic criteria that must be met are:

A 25% immediate utilization rate, and

A 50% utilization rate within one year.

A greater utilization rate may be required based on individual network requirements. Please refer to RFC 2050 for more information on utilization guidelines.

Any help would be greatly appreciated.

[Collin Clark]

Do you currently have a tier1 provider (ie ATT)? Do you continue to use that provider? It's usually easier to have the ISP request it on your behalf. You can get a /24 in their space, but that shouldn't be a problem if you don't swap carriers.

[rtjensen4]

I believe our ISP (TW Telecom) is a Tier 2. If we have the ISP request it on our behalf, would we be able to announce that network to our 2nd ISP for failover purposes? Will ISPs typically allow that or is that somthing that's negotiable?

Thanks.

[Collin Clark · Accepted solution]

As long as it's a public address space the second ISP will allow you to advertise it. A very common scenario with ISPs.