PTR-record

Q: Wat is een PTR-record?

Reverse DNS — maps an IP back to a hostname. PTR records live in the special in-addr.arpa (IPv4) and ip6.arpa (IPv6) zones. They are set by whoever owns the IP block (ISP, cloud provider) and translate an address back to a name. Mail servers and many security tools use reverse DNS for verification and logging.

Reverse DNS — maps an IP back to a hostname.

Wat is een PTR-record?

PTR records live in the special in-addr.arpa (IPv4) and ip6.arpa (IPv6) zones. They are set by whoever owns the IP block (ISP, cloud provider) and translate an address back to a name. Mail servers and many security tools use reverse DNS for verification and logging.

Voorbeeld zone-file-entry

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

Gangbare use cases

▸Pass outgoing-mail reputation checks — mail receivers require PTR forward-confirmed reverse DNS (FCrDNS).
▸Friendly logs — Apache, Nginx, syslog and SIEMs annotate IPs with hostnames.
▸Tracing in tracerouting — hop names are PTR records.
▸Allow-listing by hostname rather than IP in some security tools.

Veelvoorkomende valkuilen

You can almost never edit PTR yourself — you must ask your ISP / cloud provider (AWS Route 53 lets EC2 customers set PTR via support ticket; DigitalOcean and Hetzner expose it in the UI).

DNS-records opzoeken →

Verwante recordtypen

A record

Maps a domain name to an IPv4 address.

AAAA record

Maps a domain name to an IPv6 address.

NS record

Lists the authoritative name servers for a zone.