PTR Record Check
The PTR record is within the DNS Zone of a single domain, one of several DNS records present and has its own function. The acronym PTR stands for DNS pointer record and is used for the so-called reverse DNS lookup process where we use an IP address to find out the domain name associated with that IP address. Hence the reverse and bears the name since it is the diametrically opposite process of DNS lookup through which we find out the IP address and other DNS records through the domain.
Reverse DNS lookup for IPv4 and IPv6
Reverse DNS lookup differs depending on whether it is used for an IPv4 or IPv6 address:
- 1) In IPv4, the reverse lookup technique takes place via a special domain in.addr.arpa, since the PTR record is stored in that domain, through which we find out the host name for the requested IP address. For example, IP address 220.127.116.11 uses the domain 18.104.22.168.in-addr.arpa, which indicates the use of host name mail.google.com. The PTR record for the IP address is 22.214.171.124 126.96.36.199.in-addr.arpa in PTR mail.google.com
- 2) In IPv6, the reverse process takes place via the dedicated domain ip6.arpa so that for example the PTR record for the IPv6 address 2607:f8b0:4009:816::2005 uses e.0.0.2.0.0.0.0.0.0.0.0.0.0.0.0.6.188.8.131.52.0.0.4.0. b.8.f.184.108.40.206.ip6.arpa in PTR mail.google.com.
To find the PTR record for IPv4 or IPv6 use our free Reverse DNS lookup tool.
- Reverse DNS
- IP: 220.127.116.11
- Arpa: 18.104.22.168.in-addr.arpa
- Host Name: ec2-44-197-197-23.compute-1.amazonaws.com