DNS Terbalik (Rekaman PTR)
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Pencarian DNS terbalik memetakan [[ip-address|alamat IP]] kembali ke nama domain menggunakan rekaman PTR. Ini kebalikan dari pencarian [[dns|DNS]] standar. DNS terbalik umumnya digunakan untuk verifikasi server email — banyak server email menolak pesan dari IP tanpa rekaman PTR yang valid.
Contoh
Mail servers check that the IP 203.0.113.1 has a PTR record matching mail.example.com before accepting email from it.