Reverse IP Lookup
Find the PTR (reverse DNS) hostname of an IPv4 or IPv6 address — and check that it points back to the same IP.
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By MegaHostZone · AS132563
What is reverse DNS (PTR)?
Normal DNS turns a hostname into an IP address. Reverse DNS does the opposite: it turns an IP address back into a hostname using a PTR record. PTR records live in special zones — in-addr.arpa for IPv4 and ip6.arpa for IPv6 — and are controlled by whoever owns the IP block, usually the ISP or hosting provider.
Why it matters
- Email delivery – most mail servers reject or flag mail from IPs without a valid PTR record.
- Forward-confirmed reverse DNS (FCrDNS) – the PTR hostname should resolve back to the same IP. Mail providers check this to spot spoofing.
- Troubleshooting – a PTR name often tells you which provider or server an IP belongs to.
Need a PTR record set for an IP on a MegaHostZone server? Contact our support team.
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