1. ENUM User Guide
  2. Non-ENUM or DNS Query Handling
  3. DNS Record Configuration
  4. PTR Record

4.2.7 PTR Record

A DNS pointer record (PTR) provides the domain name associated with an IP address. DNS PTR records are used in reverse DNS lookups.

In IPv4: DNS PTR records are stored under the IP address (reversed), and with .in-addr.arpa added.

For example: The PTR record for the IP address 192.0.2.255 would be stored under 255.2.0.192.in-addr.arpa.

Table 4-10 PTR Record - 192.0.2.255

Domain Name TTL Record Type Value
1.2.0.192.in-addr.arpa 14400 PTR example.com
In IPv6: IPv6 PTR records are stored under the IPv6 address (reversed) and converted into four-bit sections, along with .ip6.arpa.

Table 4-11 IPv6 PTR Records

Domain Name TTL Record Type Value
7334.0370.8a2e.0000.0000.85a3.0db8.2001.ip6.arpa 14400 PTR example.com