Record PTR (DNS Terbalik)
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Record PTR (Pointer) memetakan [[ip-address|alamat IP]] kembali ke hostname, memungkinkan pencarian DNS terbalik — kebalikan dari pencarian [[a-record|record A]] atau [[aaaa-record|record AAAA]]. Record PTR berada di zona pencarian terbalik khusus di bawah domain in-addr.arpa (IPv4) dan ip6.arpa (IPv6), di mana oktet atau nibble IP ditulis dalam urutan terbalik. Server surat menggunakan record PTR sebagai sinyal anti-spam dasar: IP pengirim tanpa record PTR yang cocok (atau yang PTR-nya tidak mengonfirmasi kembali ke IP yang sama) sering ditolak oleh filter spam. ISP dan penyedia hosting mengendalikan delegasi zona terbalik ini.
Contoh
The IP 93.184.216.34 has a PTR record pointing to 93.184.216.34.in-addr.arpa that resolves to 'edgecastcdn.net'; mail servers verify this to confirm the sender IP is legitimately associated with the claimed domain.