# DNS Chain
This data call returns the recursive chain of DNS forward (A/AAAA/CNAME) and reverse (PTR) records starting form either a hostname or an IP address.
GET /data/dns-chain/data.json?resource=www.ripe.net
# Parameters
| Key | Value | Info | Required |
|---|---|---|---|
| resource | Hostname or IP address (Ipv4 or IPv6) | Defines the resource that the query is performed for. | YES |
# Data Output
| Key | Info |
|---|---|
| forward_nodes | A key-value list in which the key is a hostname and the value is the list of IP addresses/hostnames to which it has A/AAAA/CNAME records pointing to. |
| reverse_nodes | A key-value list in which the key is an IP address and the value is the list of hostnames to which it has PTR records pointing to. |
| nameservers | The list of IP addresses of the DNS resolvers used to do perform the DNS queries. |
| authoritative_nameservers | The list of the authoritative nameservers for the returned DNS records. |
| query_time | Defines the time of the query. |
| resource | Defines the resource used in the query. |