What is my IP address
The address this server sees when your browser connects. Below it, the part most of these pages leave out: what kind of address it is, and whether it is really yours.
Your address
checking…
Reverse DNS (PTR)
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The name this address answers to. Most home connections have none, and that is normal. On a server that sends email it is not: a missing or generic PTR is one of the first things a receiving mail server holds against you.
How your browser identifies itself
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This is not something we can detect — it is what your browser tells every site it visits, printed back so you can see exactly what arrives here.
From a terminal
On a server you have just built, with no browser and nothing installed:
Plain text, one line, no JSON to parse. That is the address that machine goes out through, which is not always the one your laptop sees.
What this page does not tell you
Your city, your street or your name. Those pages guess from a commercial database that maps address ranges to places, and for mobile and business connections it is wrong more often than not — we would rather show nothing than a confident wrong answer. What we do know is what is above: it comes from the connection itself, not from a lookup table.
Setting up a server with this address?
If it is going to send email, the address matters more than you would like: its reverse DNS, whether it sits on a blacklist, and whether SPF and DMARC line up with it. Mail Doctor checks a domain’s side of that in a few seconds, and Mail Tester scores a message you actually send.