What is Reverse DNS
Below is a MRR and PLR article in category Internet Business -> subcategory Other.
Understanding Reverse DNS
Overview
Reverse DNS (Domain Name System) lookup, abbreviated as rDNS, is the process of finding a host name from a given IP address. Unlike standard DNS that resolves host names to IPs, rDNS works in the opposite direction.
Why Use Reverse DNS?
Troubleshooting: Reverse DNS is commonly used in network troubleshooting. Tools like traceroute or ping employ rDNS to trace the path of internet traffic.
Email Verification: Modern email providers utilize rDNS to check if emails originate from recognized spam sources, enhancing email security.
Security Measures: The technique known as Forward Confirmed Reverse DNS (FCrDNS) verifies the relationship between a server and its domain name owner, helping to prevent phishing and spam.
IPv4 Reverse DNS Lookup
For IPv4 addresses, reverse DNS uses the in-addr.arpa domain. The IP address is reversed and appended with in-addr.arpa. For example, 192.168.1.1 becomes 1.1.168.192.in-addr.arpa during a lookup.
IPv6 Reverse DNS Lookup
IPv6 addresses use the ip6.arpa domain for reverse DNS. Unlike IPv4, IPv6 addresses are reversed in nibbles (four-bit units) and separated by periods. For instance, the address 2001:0db8:0:0:0:0:1428:57ab translates to b.a.7.5.8.2.4.1.0.0.0.0.8.b.d.0.1.0.0.2.ip6.arpa.
Multiple Host Names on One IP Address
Reverse DNS can identify all host names linked to a single IP address. However, this can be problematic when multiple websites share an IP under budget hosting plans, leading to complications with various services.
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