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Usually, devices on the same home Wi-Fi share a public IPv4 address, but each device normally has its own private IP address. A router uses Network Address Translation (NAT) to let those devices reach the internet through one public IPv4 address. The answer can differ with IPv6, a VPN, a phone hotspot, or a separately routed network.
“IP address” can mean a local address used inside your network or a public address seen by internet services. Keeping those two meanings separate explains most apparent contradictions.
Public IP vs. private IP: what are you comparing?
| Address type | What it does | Example | What a website usually sees |
|---|---|---|---|
| Private or local IPv4 | Identifies a device within a local network, such as your home Wi-Fi. | 192.168.1.20 |
Usually not this address. The router translates the connection before it reaches the internet. |
| Public IPv4 | Identifies the internet-facing connection or exit point. | A numeric IPv4 address assigned by an ISP or used by an intermediary | Usually this address when the device connects directly through the household router. |
| IPv6 | Provides a separate addressing system; a device may have more than one IPv6 address. | A long hexadecimal address, such as one beginning with 2001: |
A device’s IPv6 address may be visible if the site and network use IPv6. |
Private IPv4 addresses come from ranges reserved for local networks: 10.0.0.0/8, 172.16.0.0/12 and 192.168.0.0/16. They can be reused in separate homes because they are not globally unique or directly routed across the public internet. RFC 1918 defines these ranges.
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Why devices usually share a public IPv4 address
A home router commonly assigns each connected device a different private address, often using DHCP. The router then translates their internet-bound traffic so that it uses the household’s public IPv4 address. It tracks connection details, including port numbers, so replies can be directed back to the right device.
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Phone 192.168.1.20 ┐
Laptop 192.168.1.21 ├── Wi-Fi router (NAT) ── one public IPv4 ── Internet
TV 192.168.1.22 ┘So a “what is my IP?” check on a phone and laptop may show the same public IPv4 even though the router lists different local addresses for them. Cisco explains how NAT lets one address represent multiple internal computers and how Port Address Translation allows multiple hosts to share an address using ports: Cisco’s NAT FAQ and NAT overview.
When devices on the same Wi-Fi may show different public addresses
- IPv6: Devices may have distinct globally routable IPv6 addresses while sharing a network prefix. A device can also have several IPv6 addresses, including temporary privacy addresses that may change. Some networks use IPv6 alongside IPv4; behavior depends on the ISP, router and device. See Apple’s networking overview.
- VPN: A device sending traffic through a VPN may appear to use the VPN server’s address, while another device on the same Wi-Fi uses the household connection. Split tunneling or different VPN servers can also lead to different results. A VPN does not normally change the devices’ private Wi-Fi addresses.
- Different routes or connections: One device may be on cellular instead of Wi-Fi, use a proxy, connect to a second router, or use an internet route different from the others. A browser extension or security app may also proxy some traffic.
- IPv4 and IPv6 are being compared: Two devices—or two checks on one device—may show different addresses because one result is IPv4 and another is IPv6. Compare like with like, and check both where available.
Can different homes share the same public IP?
Yes. An ISP can use carrier-grade NAT (CGNAT) to share public IPv4 addresses among multiple customers. Public Wi-Fi, businesses, schools, hotels, VPNs and proxy services can also send many users’ traffic through one public address.
Ordinary home NAT:
Device → home router → household public IPv4 → Internet
CGNAT:
Device → home router → ISP shared-address network → shared public IPv4 → InternetIf a router’s internet or WAN status shows an address that differs from the public IPv4 shown by a website, that can indicate CGNAT or another upstream router doing NAT. The mismatch is a clue, not proof on its own: a VPN, proxy, or comparison of IPv4 with IPv6 can also explain it. The IETF’s RFC 6269 discusses address-sharing complications, including CGNAT and public Wi-Fi.
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A shared public IP identifies an internet exit point, not one person, device or household. It can also explain why an IP-based ban or challenge affects several people who have no other connection to one another.
Does sharing an IP mean devices can see each other?
No. Sharing a public internet address does not mean devices can communicate locally or access one another’s files. Guest Wi-Fi, client isolation, VLANs, firewalls or a second router can block device-to-device traffic even while devices use the same public exit address. Apple notes that local-network traffic is not forwarded by a router in its local-network privacy guidance.
Nor does a shared IP make users indistinguishable to websites. Services may also use account logins, cookies, browser or device characteristics, and other application signals. A routine web request generally reveals the public route, not a device’s private address such as 192.168.1.20; do not treat that as a promise that no application or browser feature can reveal other network information.
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How to check both kinds of address
Check the private address on the device
- Windows: Open Command Prompt or PowerShell and run
ipconfig. Under the active Wi-Fi adapter, look for IPv4 Address and, if present, an IPv6 address. Default Gateway is usually the router’s local address. - macOS: Open System Settings → Wi-Fi, select Details for the connected network, then open TCP/IP. Check the IPv4 address, router and any IPv6 information shown. Labels can vary by macOS version.
- Linux: Run
ip address, or useip -4 addressandip -6 addressto focus on each protocol. Check the active wireless interface.
On the same local network, devices should normally have distinct private IPv4 addresses. If two are configured with the same one, they can experience an IP conflict: intermittent access, failed connections or traffic reaching the wrong device. DHCP usually assigns addresses automatically, and its leases may change after reconnecting or over time. A DHCP reservation can keep a device’s local address consistent; a manually configured static address can do the same if set correctly. Neither gives the device a unique public address.
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Use a reputable IP-check page on each device, and compare IPv4 with IPv4 and IPv6 with IPv6 if the page reports both. Temporarily disconnect VPNs and check that each device is using the same connection before drawing conclusions. You can also inspect the router’s internet or WAN status page and compare its address with the public IPv4 shown by the browser. Router labels vary by manufacturer.
- Same public IPv4 on all devices: Normal for a typical home IPv4 connection using NAT.
- Different results: Check for a VPN, proxy, cellular connection, IPv6, separate routers or another routing difference.
- Router WAN address differs from the website’s public IPv4: Possible CGNAT or another upstream NAT layer; also rule out a VPN, proxy and IPv4/IPv6 mismatch.
Common problems and what they mean
“My phone and laptop show different IPs”
Check whether one is using a VPN, cellular data, a proxy, IPv6, or a second routed network. If both are on the same Wi-Fi, use the same address family for the comparison and temporarily disable VPNs. Different private addresses are expected; different public addresses need an explanation in the route each device uses.
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“My router shows one address, but the website shows another”
The router may be behind CGNAT or another modem/router performing NAT, or a VPN or proxy may be changing the visible route. Confirm that you are comparing the router’s IPv4 WAN address to a website’s IPv4 result, rather than comparing IPv4 with IPv6.
“Port forwarding does not work”
Port forwarding on the home router may not be enough if the ISP uses CGNAT or there is another router upstream. Other possibilities include a device firewall, ISP port restrictions, a forwarding rule aimed at an outdated local address, or an IPv4/IPv6 mismatch. A DHCP reservation can help keep a forwarding target’s local IPv4 address stable, but it does not bypass CGNAT.
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“My IPv6 address changed”
This can be normal. Privacy or temporary IPv6 addresses may change over time. A changing address alone does not mean the Wi-Fi is broken.
“A site blocked everyone here”
A restriction based on a shared public IP can affect multiple users on a home, company, public Wi-Fi, VPN or CGNAT connection. It does not prove that every affected user is the same person or device.
Does everyone on the same Wi-Fi have the same IP?
For a conventional IPv4 home network, the concise answer is: different private IPv4 addresses, usually one shared public IPv4 address. IPv6, VPNs, separate routes and ISP address sharing can change what an IP-check page reports. A shared address is a shared route to the internet—not proof of a shared identity or permission for devices to access one another.
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