Vultr Customer Portal

1. Navigate to Products and click Compute.
2. Click your target Vultr VX1™ Cloud Compute instance to open its management page.
3. Navigate to the Settings tab.
4. Click IPv4 on the left navigation menu to view the instance’s public IPv4 network information.
5. Click Add Another IPv4 Address to attach an additional public IP address to the instance.
6. Check the confirmation prompt and click Add IPv4 Address to attach the new public IP address and restart your instance.
7. Click the default IPv4 reverse DNS value and replace it with a custom value to enable reverse DNS on the instance.

Vultr API

1. Send a GET request to the List Instances endpoint and note your target instance’s ID.
   console

   $ curl "https://api.vultr.com/v2/instances" \
     -X GET \
     -H "Authorization: Bearer ${VULTR_API_KEY}"

2. Send a GET request to the List Instance IPv4 Information endpoint to view the instance’s IPv4 information.
   console

   $ curl "https://api.vultr.com/v2/instances/{instance-id}/ipv4" \
     -X GET \
     -H "Authorization: Bearer ${VULTR_API_KEY}"

3. Send a POST request to the Create IPv4 endpoint to attach a new IPv4 address to the instance.
   console

   $ curl "https://api.vultr.com/v2/instances/{instance-id}/ipv4" \
     -X POST \
     -H "Authorization: Bearer ${VULTR_API_KEY}" \
     -H "Content-Type: application/json" \
     --data '{
       "reboot" : true
     }'

4. Send a POST request to the Create Instance Reverse IPv4 endpoint to enable reverse DNS on the instance.
   console

   $ curl "https://api.vultr.com/v2/instances/{instance-id}/ipv4/reverse" \
     -X POST \
     -H "Authorization: Bearer ${VULTR_API_KEY}" \
     -H "Content-Type: application/json" \
     --data '{
       "ip" : "<ipv4-address>",
       "reverse" : "<domain>"
     }'