Which of the following DNS records is used to map an IP address to a hostname?

The correct answer is A. PTR. A PTR (Pointer) record performs reverse DNS lookup - it maps an IP address to a hostname, which is the opposite direction of a standard A record. The A record (option D) maps a hostname to an IPv4 address, making it the forward lookup record. An SOA (Start of Authority) record…

Network Security

Question

Options

APTR
BSOA
CNS
DA

How the community answered

(16 responses)

A
94% (15)
C
6% (1)

Explanation

A PTR (Pointer) record performs reverse DNS lookup - it maps an IP address to a hostname, which is the opposite direction of a standard A record. The A record (option D) maps a hostname to an IPv4 address, making it the forward lookup record. An SOA (Start of Authority) record (option C) contains administrative metadata about a DNS zone, such as the primary nameserver and refresh intervals. An NS (Name Server) record (option B) identifies which servers are authoritative for a domain, not address-to-hostname mappings.

Memory tip: Think of PTR = "Points To Reverse" - it's the record you use when you have an IP and need to find the hostname, like reading a phone book backwards.

Topics

#DNS Records#PTR Records#Reverse DNS#IP-to-Hostname Mapping

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