What Is My IP Address? How to Find Your Public IPv4 & IPv6

“What is my IP address?” is one of the most common networking questions on the internet — and until now, answering it on MailCannon meant sending people to a third-party site. That changes today. We have added a dedicated What Is My IP Address tool to our free email and network tools collection. Open the page and your public address appears immediately, together with the address family (IPv4 or IPv6), an approximate location, and network ownership details such as the ISP, organization and ASN.

In this article we explain what a public IP address is, how the new tool detects yours, what an IP address can and cannot reveal about you, and why your public IP matters if you send email.

What Is a Public IP Address?

A public IP address is the address that websites and online services see when your device connects to the internet. It is usually assigned by your internet service provider, mobile carrier, company network, VPN or proxy, and it is how the response to your request finds its way back to you. Inside your home or office, your devices use separate private addresses that are not reachable from the internet — only your router's public address is exposed to the outside world.

There are two address families in everyday use:

• IPv4 — the original scheme: 32-bit addresses written as four numbers between 0 and 255, such as 203.0.113.45. Roughly 4.3 billion of these exist, and that pool is now exhausted.
• IPv6 — the modern scheme: 128-bit addresses written as eight groups of hexadecimal digits, such as 2001:db8::1234, providing enough addresses for the foreseeable future.

Many networks are dual-stack, meaning a device can connect over either family. The MailCannon tool reports the family your connection actually used to load the page and shows IPv4 and IPv6 separately, rather than guessing.

How the What Is My IP Address Tool Works

The tool does two things: it detects the address your connection used to reach the page, then it looks that address up.

Step 1 — Detection

When your browser opens the tool, the request travels through your router, your ISP and possibly a VPN or proxy before it reaches MailCannon's servers. The tool reads the public address that the request arrived from and identifies whether it is IPv4 or IPv6. Nothing needs to be installed, and no browser extension, app or account is required.

Step 2 — Lookup

The detected address is then looked up to estimate its location and network ownership. The result typically includes the country, region, city, postal code and timezone associated with the network, plus the ISP, organization, ASN and sometimes the hostname. If only the address itself is available, the tool reports exactly that instead of filling in guessed details.

Step 3 — Refresh after any network change

Use the Refresh button after switching Wi-Fi or mobile networks, connecting or disconnecting a VPN, or restarting your router. Because the page is never cached, you always get the address your connection is using right now.

Look up any other address

The tool also includes a Look Up Another IP Address section. Enter any public IPv4 or IPv6 address — for example 8.8.8.8 or 2001:4860:4860::8888 — to see its approximate location and network details. Hostnames and URLs are not accepted; only valid public IP addresses.

What Information Can an IP Address Reveal?

An IP address is tied to the network that owns it, so a lookup can reliably show the country, and often the region, city, postal code and timezone associated with that network. It also reveals network ownership details: the ISP, the organization, the ASN, and sometimes the hostname and connection type. Geolocation providers map these by keeping databases of which address blocks belong to which networks and regions.

Why Does My IP Address Change?

If you check your address and then check again later, you may see a different value. That is normal:

• Most ISPs assign addresses dynamically, and reconnecting or restarting your router can issue a new one.
• Switching between Wi-Fi and mobile data moves you to a different network with a different address.
• Connecting a VPN replaces your address with the VPN server's address; disconnecting restores it.
• Roaming between cell towers or load-balanced gateways can reassign you mid-session.

Why Is My IP Location Wrong?

IP geolocation is accurate at country level in most cases, and often reliable down to region or city, but it is not GPS-accurate. The most common reasons for a wrong location are:

• A VPN or proxy makes the lookup report the exit server's location instead of yours.
• Mobile carriers pool addresses across wide regions, so the city shown may be a regional hub.
• ISP routing and reassignments can lag behind geolocation database updates.
• Some address blocks are simply registered to a company's headquarters, not where they are used.

The tool deliberately labels the result an approximate location, because it reflects the network that operates the address — which may be your ISP, VPN, proxy or mobile carrier.

Can Someone Find My Exact Address from My IP?

Not your street address. An IP address identifies a network connection, not a person or a building, so a lookup provides approximate network and geographic information — typically the country, region and city of the ISP or gateway that operates the address. Combining an IP with other data, such as an account you logged into, can narrow things down further, but the IP address alone does not reveal your name, your identity or your exact physical location.

How a VPN Affects Your IP Address

When you connect to a VPN, your traffic exits through the VPN provider, so websites see the VPN server address and its location rather than your own. This is why the tool may show a city or country you are not in while a VPN is running. Disconnecting from the VPN and refreshing the page shows your regular address again. It is also a quick way to confirm that a VPN connection is actually up and routing traffic as expected.

Why Your Public IP Matters for Email Senders

You might wonder why an email marketing platform like MailCannon ships an IP address tool. The answer is that your public IP is one of the first things receiving mail servers look at when you send email. The address you send from feeds directly into email deliverability and sender reputation:

• Blacklists — DNSBL databases list sending IP addresses with poor reputations. Check yours with the Email Blacklist Checker.
• Authentication — SPF, DKIM and DMARC tie your sending domain and IP together. Read our SPF, DKIM and DMARC guide.
• VPN and office networks — if you send or test email from behind a VPN, the IP you see here is the one servers will judge.
• Network troubleshooting — confirming your public IP is the first step in diagnosing routing, blocking or connectivity problems.

Knowing your own address also helps you communicate clearly with an ISP, blacklist operator or IT team, because “what is my IP” is usually the first question they ask.

When Should You Check Your IP Address?

1. Before contacting IT support or a blacklist operator about a delivery problem.
2. After connecting or disconnecting a VPN, to confirm the exit address changed.
3. When a website shows the wrong country or language for your location.
4. Before running an IP blacklist check or an email deliverability test.
5. When diagnosing remote access, gaming, streaming or connectivity issues.
6. When you simply want to verify what the internet can see about your connection.

MailCannon Tools Ecosystem

The What Is My IP Address tool is part of a broader set of MailCannon tools designed to help you create, test and optimize your emails and your sending infrastructure:

• What Is My IP Address — Detect your public IPv4 or IPv6 address and network details.
• Email Deliverability Checker — Test emails before sending.
• Email Blacklist Checker — Check DNSBL listings for your domain or IP.
• Email Authentication Checker — Check SPF, DKIM, DMARC, BIMI and MTA-STS records.
• Email Spam Checker — Check content for spam-risk signals.
• Email Address Checker — Verify if an email address exists.

Frequently Asked Questions

Conclusion

“What is my IP address?” is a question that should take one second to answer, and now it does. The MailCannon What Is My IP Address tool detects your public IPv4 or IPv6 address the moment the page loads, then shows the approximate location, ISP, ASN and network details behind it — free, with no account and no tracking profile.

If you send email, pair it with the Email Blacklist Checker, the Email Authentication Checker and the Email Deliverability Checker to keep your sending infrastructure healthy. For more background, read our guides on email deliverability and how to improve it.