What is a public IP address?

Your public IP address is the address visible to websites and services you connect to. It is assigned by your ISP and may differ from your device's local LAN address.

Why does my IP address look different from what I expect?

VPNs, corporate proxies, and carrier-grade NAT can change the IP address visible externally. The returned address reflects the exit point of your connection.

Is my IP address logged?

StackCache does not log the lookup or the result. The query goes directly to ipify, whose documentation states visitor information is not logged.

Can I find my IPv6 address?

This tool returns your IPv4 address. For IPv6, check your device's network settings or use an IPv6-specific lookup service.

Public IP Lookup

Ask ipify for the public IPv4 address visible from this connection.

Declared service

Explicit network action

Ask before contacting the provider

Destination: https://api.ipify.org?format=json
Provider: api.ipify.org
Request: Credentialless HTTPS GET · 5-second timeout · no automatic retry

This leaves the browser.

ipify necessarily receives your connection IP and normal browser request metadata. StackCache sends no body, cookies, credentials, custom headers, app identifier, or tool content, and does not proxy the request.

No request made

Your address stays unknown to StackCache

Run the lookup only when you want ipify to return the public address visible from this connection.

Working notes

Use Public IP Lookup with the boundary visible.

Public IP Lookup asks the disclosed ipify endpoint for the IPv4 address visible from the current connection only after you press the lookup action.

What is Public IP Lookup?

Every device connected to the internet has a public IP address — the address that websites and services see when you connect to them. This address is assigned by your Internet Service Provider (ISP) and is typically different from the private IP address your device uses on its local network (192.168.x.x or 10.x.x.x). Knowing your public IP is useful for configuring firewall rules, debugging VPN connections, setting up remote access, and diagnosing network issues. Your public IP can change when you switch networks, restart your router, or when your ISP assigns a new address via DHCP. VPNs, corporate proxies, and carrier-grade NAT (CGNAT) can also change the address that external services see. This tool sends a single HTTPS request to the ipify API, a well-known public IP detection service, and displays the returned address. The request goes directly from your browser to ipify — StackCache does not proxy, cache, or log the result.

When to use it

Configuring firewall rules — find your public IP to add it to a cloud security group or firewall allowlist.
Verifying VPN connection — check whether your traffic exits through the VPN endpoint or your ISP.
Setting up remote access — confirm the IP address to use when configuring SSH access, RDP, or port forwarding.
Debugging network issues — verify that your public IP matches expectations when troubleshooting connectivity to external services.
ISP troubleshooting — check if your ISP has assigned a new IP address after a router restart or service interruption.

How to use it

01Review the provider disclosure: the request goes to ipify.org over HTTPS.
02Click the lookup button to send the request.
03Your public IPv4 address is displayed.
04Use the address for firewall rules, VPN verification, or network diagnostics.

Common mistakes

Confusing public and private IPs — your device's local IP (192.168.x.x) is different from the public IP seen by external services. This tool shows the public IP.
Assuming a static IP — most residential ISPs assign dynamic IP addresses that can change. Do not hard-code your public IP in long-term configurations without confirming it is static.
VPN split tunneling — if your VPN uses split tunneling, some traffic may exit through your ISP while VPN traffic uses a different IP. This tool shows the IP for the traffic that reaches ipify.
Carrier-grade NAT — mobile carriers and some ISPs share a single public IP among many customers. The displayed IP may be shared with other users.
IPv6 vs IPv4 — this tool returns your IPv4 address. Your IPv6 address may be different and is not shown.

Synthetic example

Example provider response

Input

Explicit lookup request

Result

203.0.113.7 (documentation-only address)

Related standards

Limits and data boundary

ipify receives the connection IP and normal browser request metadata.
VPNs, proxies, carrier NAT, and IPv6 routing can make this differ from a device or LAN address.

Frequently asked questions

What is a public IP address?: Your public IP address is the address visible to websites and services you connect to. It is assigned by your ISP and may differ from your device's local LAN address.
Why does my IP address look different from what I expect?: VPNs, corporate proxies, and carrier-grade NAT can change the IP address visible externally. The returned address reflects the exit point of your connection.
Is my IP address logged?: StackCache does not log the lookup or the result. The query goes directly to ipify, whose documentation states visitor information is not logged.
Can I find my IPv6 address?: This tool returns your IPv4 address. For IPv6, check your device's network settings or use an IPv6-specific lookup service.

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