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$ curl repovive.com/roadmaps/network-design/dhcp-and-dns/reverse-dns-lookup

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$ curl repovive.com/roadmaps/network-design/dhcp-and-dns/reverse-dns-lookup

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Reverse DNS Lookup - DHCP and DNS | Network Design | Repovive

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Network Design26 sections · 911 units44h total

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Reverse DNS Lookup

IP to name

Reverse DNS goes the other direction: give an IP, get a name.

Query: 142.250.80.14
Answer: lax17s62-in-f14.1e100.net

Reverse lookups use the special in-addr.arpa domain. The IP is reversed and appended: $14.80.250.142$ .in-addr.arpa.

Email servers use reverse DNS to verify senders. If your mail server's IP doesn't have a PTR record, many servers reject your mail as spam.