Webmaster & Network·4 min read

IPv4 vs IPv6 Explained: What Your IP Address Says

Two very different addresses follow you around the internet, and most people have never looked at either one. The short dotted number and the long colon-separated one do the same job in two eras of the network, which is why ipv4 vs ipv6 explained properly starts with your own connection rather than a textbook. Check your address once and the abstractions get concrete fast: what's public, what's private, what a remote server sees, and what it can actually do with that information.

Open the tool All insights

The moments your own IP address suddenly matters

It comes up more than you'd think.

Nobody checks their address for fun. It happens when a database firewall needs your address before it will let you connect, when an API rejects requests from an address that changed overnight, when you're on a support call and the technician asks what you're connecting from, or when you've paid for a VPN and want proof it's doing anything.

In each case the number you need is your public address as servers see it, which is exactly what the What Is My IP page reads from your request the moment it loads. No button, no form, just the answer.

Public vs private IP: the two addresses you hold at once

Your router speaks both.

Every device on your network has a private address, something like 192.168.1.24, valid only inside your walls. The router holds the single public address your ISP assigned and translates between the two worlds, a scheme called NAT that lets a whole office share one public identity.

The public vs private ip distinction explains a whole family of confusions. The address in your laptop's network settings won't match what a website reports, because they're different addresses doing different jobs. Allowlists, bans, and geolocation all key off the public one, while port forwarding and printer setups live in the private range.

IPv4 vs IPv6 explained with the address on your screen

Two formats, one job.

IPv4 addresses are four numbers from 0 to 255, about 4.3 billion combinations, and we ran out years ago. IPv6 answers with 128-bit addresses written in hex, enough to give every grain of sand a subnet, and removes the need for NAT workarounds entirely.

Which one this page shows depends on your network's preference at request time. See a long address with colons and your connection went over IPv6; see dotted decimals and it was IPv4. Both can be true simultaneously on a dual-stack connection, and neither is better for everyday browsing, though IPv6 adoption keeps climbing on mobile carriers especially.

A sample IP readout, decoded line by line

A worked example.

Imagine the page shows 203.0.113.88 in the big readout, with timezone Europe/Berlin, language de-DE, screen 2560x1440, and a User-Agent naming Chrome on Windows. That single screen is roughly what every website you visit collects passively.

The address itself is IPv4, and it belongs to your ISP, not to you. If the same connection preferred IPv6, you'd see something like 2001:db8:85a3::8a2e:370:7334 instead, the double colon standing in for a run of zeros. Meanwhile the 192.168.1.24 in your laptop's settings appears nowhere, because private addresses never leave your network.

What your IP reveals, and what it can't

Less than the movies claim.

Here's what your ip reveals to a remote server: your ISP, a rough region, usually city-level at best, and whether you're on a known VPN or datacenter range. Combined with browser details like timezone and language, it supports the loose fingerprinting that ad networks lean on.

What it can't do is name you or locate your front door. Mapping an address to a person requires records only your ISP holds, released through legal process. The geolocation city is frequently wrong anyway, since databases place addresses at ISP infrastructure rather than at subscribers.

IP address assumptions that cause real problems

A few recurring misreads worth retiring:

Believing incognito mode hides your IP. Private browsing clears local history, nothing more; every site still sees the same public address.
Allowlisting a home IP and treating it as permanent. Dynamic assignment means a router reboot can silently break your own access.
Panicking because a stranger has your IP. On its own it enables little beyond the geolocation guess you just saw.
Reading the wrong city in a lookup as evidence of hacking, when it's just the database naming your ISP's regional hub.

Quick IP checks worth making a habit

Check before you allowlist, every time, rather than reusing the address from last month's ticket. It takes five seconds and beats debugging a mysterious connection refusal.

Test your VPN with a before-and-after pair: note the address, connect, refresh. Different address, working tunnel. Same address, the VPN isn't carrying your browser traffic no matter what its status icon claims. And after any router or ISP change, glance at whether you've moved between IPv4 and IPv6, since some older services still behave differently across the two.

What Is My IP beside Domain to IP and DNS Lookup

Two directions of the same question.

This page answers the outbound identity question: the address you present to the internet. Domain to IP asks the mirror image, which addresses a given name presents to you, and the two pair naturally when you're connecting a machine to a server allowlist from both ends.

When the question widens beyond addresses into mail routing or domain verification, DNS Lookup covers the full record set, and HTTP Headers Checker shows what a server declares back once your request actually arrives.

Try it now

Open What Is My IP

The tool is one click away. No sign up, no upload, no payment.

Open What Is My IP

Write a review