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IP Lookup

See an IP’s reverse DNS or the addresses a domain resolves to.

Example: 8.8.8.8 uzmantescil.com.tr

IP address

1.1.1.1

IP
1.1.1.1
Reverse DNS (PTR)
one.one.one.one

What an IP lookup is for

It shows the reverse DNS (PTR) of an IP, or the IPv4 and IPv6 addresses a domain resolves to. PTR is the record from the address back to a name. Missing PTR on a mail server is a common reason messages land in spam.

Several addresses usually mean a CDN or a load balancer. One address can still be a single server or an anycast point. This tool does not invent a city. It stays with the resolved addresses and the PTR.

PTR is not an A record

An A record goes from the name to the IP. PTR goes from the IP back to a name. If they do not agree, mail identity is weak. A website does not need PTR. A server that sends mail practically does. PTR is set by the host that owns the address, not by an A record in your own zone.

Frequently asked questions

What does IP lookup show?

The PTR name for an IP, or the IPv4 and IPv6 addresses for a domain.

Why does PTR matter?

It supports the identity of a sending mail server. Filters penalize a missing PTR.

Are multiple IPs normal?

Yes. CDNs and load balancers publish more than one A or AAAA record.

Can I write the PTR myself?

Only the network that owns the address can. A PTR in your own zone does nothing if the IP is not yours.

Why does this differ from whois?

Whois shows the registrant. This tool shows the resolved address. They are different data.

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