SharkDNS guide
4 min readrDNS and PTR record search
Search reverse DNS names to map IP addresses back to hostnames and infrastructure patterns.
rDNS lookupPTR record lookupreverse DNS searchIP hostname
When to use it
rDNS search is useful when an IP range needs context. PTR names can reveal host roles, provider naming patterns, mail server identities, or customer allocation hints.
What PTR records mean
A PTR record maps an IP address back to a hostname. It is commonly used for mail reputation, logging, network operations, and infrastructure labeling.
How to search effectively
Use contains mode for broad discovery, starts-with for provider prefixes, and ends-with for domain suffixes. Combine rDNS results with forward DNS checks before drawing conclusions.
More SharkDNS Guides
What is DNS lookup used for?
Use DNS lookup to inspect records, verify routing, troubleshoot mail, and compare public DNS visibility.
Reverse IP lookup explained
Find domains observed on the same IPv4 address and understand shared hosting or infrastructure relationships.
Subdomain discovery for asset inventory
Use public subdomain data to build a cleaner domain inventory and find exposed hosts.