What's my IP

Shows your public IP address, its reverse DNS and the network it belongs to.

Reading your addressReverse DNSNetwork

ASN lookup

Then

DNS lookup

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What it shows

The public IP address your device uses on the internet, as seen by the server answering this page, plus the reverse DNS name for that address if it has one. If your network supports both, you may see an IPv4 or an IPv6 address, depending on how your browser connected.

Public and local addresses

Your laptop has a local address like 192.168.1.20 on your home or office network. On IPv4 the router shares one public address among every device behind it, using NAT. Over IPv6 each device usually has its own public address. Websites, mail servers and allowlists see the public one, which is the one shown here.

A VPN or proxy replaces your public address with its own. Turn it on and off and refresh to see the difference.

When you need it

Adding your office to an allowlist for a firewall, a database or an admin panel.
Checking whether a VPN is on.
Checking whether your network's IP is on a blocklist before you blame your mail server.
Telling support which address your requests come from.

Why it matters for cold email

If you run a mail server or SMTP relay on your own network, this address is your sending IP. It needs a PTR record that resolves back to the same address, and it shouldn't be on a blocklist.

Home and mobile connections are listed on policy blocklists such as Spamhaus PBL by design, because mail servers aren't supposed to run on them. Send through a proper mail provider, never straight from an office or home connection.

Questions

What is my IP address?

The public address shown in the result. It's the address websites and mail servers see when you connect from this network, not your device's local address.

Why is my IP address different on my phone?

On mobile data your phone uses your carrier's network, which gives it a different public IP, often shared with many other users through carrier-grade NAT. On the same Wi-Fi as your laptop, both show the same public IPv4 address.

Can someone find my location from my IP address?

Roughly. IP location databases usually point to your provider's region or city, not your street. Your provider knows which customer used an address at a given time, but doesn't publish it.

What is reverse DNS for an IP address?

A PTR record that maps the IP back to a host name, like mail.example.com. The owner of the IP sets it, usually your ISP or host. Home connections often have a generic name or none.

Is my IP address IPv4 or IPv6?

Check the format. IPv4 is four numbers separated by dots, like 203.0.113.7. IPv6 is longer and uses colons, like 2001:db8::1. Many networks support both, and your browser picks one per connection.