Reverse DNS Pointer Generator
Convert an IP address into its reverse-DNS lookup owner name.
Build reverse lookup names from IP addresses
Reverse DNS maps an address back to a hostname by querying a special owner name under in-addr.arpa for IPv4 or ip6.arpa for IPv6. This generator validates the address and constructs that owner locally. IPv4 reverses the four decimal octets, while IPv6 expands all eight hextets into 32 hexadecimal nibbles and reverses every nibble individually.
The default address 192.0.2.1 becomes 1.2.0.192.in-addr.arpa. An IPv6 address is normalized before conversion, so compressed zero runs do not omit any nibble from the resulting ip6.arpa name. Invalid octets, duplicate double-colon compression, or malformed hextets produce explicit errors.
Byte reversal versus IPv6 nibble reversal
The generated owner is the lookup name, not a complete PTR zone record and not proof that the address delegation permits a change. Reverse zones are normally controlled by the address provider, hosting company, or network operator. No DNS request is made because conversion stays in your browser. Add the desired PTR target only through the authority responsible for that reverse zone.
Frequently Asked Questions
Why does IPv4 reverse the octets?
Reverse IPv4 DNS follows the address hierarchy from least specific octet to most specific under in-addr.arpa.
How is IPv6 reversed?
The full 128-bit address is expanded to 32 hex digits, then every nibble is reversed and separated under ip6.arpa.
Does this create the PTR record with my provider?
No. It generates the owner name only; reverse-zone control belongs to the address provider or network operator.
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