How to change Name server in ARIN LIR.
Login to ARIN Account Manager portal:
2. Click on your Networks either directly via Dashboard link or through menu option IP Addresses -> Search
3. For a prefix of interest in "View & Manage Network" click "Actions" drop down and select "Manage Reverse DNS"
4. Select the Delegation, which is going to be announced on HEFICED network and click "Modify Nameservers"