ARIN legacy block transfer process

William Herrin bill at
Fri Sep 30 17:22:19 UTC 2016

On Fri, Sep 30, 2016 at 12:49 PM, Bryan Fields <Bryan at> wrote:
> I'm trying to find a place on ARIN's website where this is addressed, but
> coming up short.  I'm not the seller or buyer in this, but basically someone
> has a legacy block allocated by Postel and wants to sell the block as it's an
> owned asset.
> What's the process to get ARIN to move the admin/ownership of this?

Hi Bryan,

If this is entirely within the ARIN region, the process is this:

1. Buyer gets approved by ARIN for a specified transfer in the amount
to be purchased. Signs RSA.
2. Legacy registrant (seller) signs the LRSA, proves identity and
authority to ARIN, places legacy block under the LRSA.
3. Buyer requests specified transfer from ARIN, seller authorizes it.
4. ARIN transfers registration to buyer, now under the RSA.

Note that you can't sell the block as an "owned asset" and have ARIN
recognize the change. ARIN does not recognize ownership of IP address
blocks, they only recognize registration and authorized agents.

Note that if the legacy block's registration is defective, you're in
for some trouble. Defects include a defunct organization where an
individual who is not the registrant has maintained the block.

Bill Herrin

William Herrin ................ herrin at  bill at
Owner, Dirtside Systems ......... Web: <>

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