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$ curl repovive.com/roadmaps/network-design/dhcp-and-dns/dns-ns-and-ptr-records

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$ curl repovive.com/roadmaps/network-design/dhcp-and-dns/dns-ns-and-ptr-records

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DNS NS and PTR Records - DHCP and DNS | Network Design | Repovive

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Network Design26 sections · 911 units44h total

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DNS NS and PTR Records

Nameservers and reverse lookup

NS records (Name Server) identify authoritative DNS servers for a domain:

example.com.  86400  IN  NS  ns1.example.com.

These records delegate authority. The parent zone (.com) uses NS records to point to your domain's authoritative servers.

PTR records map IP addresses to domain names (reverse DNS):

34.216.184.93.in-addr.arpa.  3600  IN  PTR  www.example.com.

Reverse DNS helps with email spam filtering and logging.