Your IP address changes based on your internet setup, and most home networks experience this regularly without causing problems

Whether your IP address changes depends on what you mean by "your" address. Your home network has an external IP address (the one the internet sees) and internal IP addresses for each device on your network (the ones your router assigns). The external one changes when your internet service provider reassigns it. The internal ones change when your router restarts or when you manually release them. Neither happens on a fixed schedule — it depends on your ISP's practices and your router's settings.

For home network security, the important thing is understanding which address does what, so you know whether a change actually matters for the devices you're trying to protect.

Key Takeaways

  • Your external IP address (what websites see) changes when your ISP reassigns it, which can happen days apart or months apart depending on your provider and whether you restart your modem.
  • Your internal IP addresses (what your router assigns to your devices) usually stay the same unless your router restarts or you manually release them in your router settings.
  • A changing external IP address does not weaken your home network security if your router's firewall is enabled, which it should be by default.
  • If you need a device to stay at the same internal address for port forwarding or remote access, you can assign a static IP in your router's settings instead of letting it change.
  • ISPs typically use dynamic IP assignment for home customers, while businesses usually pay extra for static IPs that do not change.

The difference between external and internal IP addresses

Your external IP address is what the outside world sees when you visit a website or send data across the internet. It belongs to your ISP, not to you, and it identifies your entire home network as a single unit. When you visit a website, that site logs your external IP. When someone runs a port scan on your network, they are scanning your external IP.

Your internal IP addresses are assigned by your router to each device on your network — your laptop, phone, smart TV, printer. These addresses only work inside your home network. A device might have an internal address like 192.168.1.5, which is meaningless to anyone outside your home. Your router translates between the two: it takes traffic from your device's internal address and sends it out under your external address, then brings responses back to the right internal address.

When people ask "does my IP address change," they usually mean the external one, because that is the one that affects whether websites can reach you or whether someone outside can connect to a device you've opened a port to.

When your external IP address changes

Your ISP assigns your external IP address using a system called DHCP (Dynamic Host Configuration Protocol). Most home internet customers get a dynamic IP, meaning the ISP can reassign it. The ISP sets a lease period — typically 24 hours to 30 days — and when that period ends, the address may change. If you restart your modem before the lease expires, the ISP often assigns a new address when ready.

How often this actually happens varies. Some ISPs reassign addresses frequently; others leave them alone for months. Restarting your modem is the most common trigger. If you restart your modem once a week, your external IP might change weekly. If you never restart it, your external IP might stay the same for months, even though technically the lease keeps renewing.

A few ISPs offer static external IPs (addresses that do not change), but this usually costs extra — $10 to $20 per month — and is marketed mainly to small businesses or people who run servers from home.

When your internal IP addresses change

Your router assigns internal addresses to your devices using the same DHCP system. When a device connects to your network, the router gives it an address from a pool (usually something like 192.168.1.100 through 192.168.1.254). The router sets a lease period, typically 24 hours. When the lease expires, the device may get a different address.

In practice, most home routers renew the lease automatically if the device is still connected, so the address stays the same. The address usually only changes if the device disconnects and reconnects, or if the router restarts.

You can override this by setting a static IP in your router's settings. This tells the router to always give a specific device the same address. This is useful if you want to set up port forwarding to a particular device, or if you want a printer or security camera to always be at the same address so you can reach it reliably.

Why a changing external IP matters less than you might think

A changing external IP does not automatically make your network less find. Your router's firewall blocks incoming connections by default — it only lets traffic through if you explicitly opened a port or if a device on your network initiated the connection first. This is true whether your external IP is static or dynamic.

Where a changing external IP becomes a problem is if you have set up port forwarding to access a device from outside your home. If your external IP changes, the address you were using to reach that device stops working. You would need to look up your new external IP and use that instead. This is why people who run home servers or want remote access to a device often pay for a static IP, or use a service like dynamic DNS that automatically updates a domain name to point to your current external IP.

For ordinary home use — browsing, email, streaming — a changing external IP has no effect on your security or your ability to use the internet.

How to check your current IP addresses

To find your external IP, visit a site like whatismyipaddress.com or straightforward search "what is my IP" in any search engine. The number that appears is what the internet sees.

To find your internal IP addresses, the method depends on your device. On Windows, open Command Prompt and type ipconfig. On Mac or Linux, open Terminal and type ifconfig or ip addr. Look for the address that starts with 192.168 or 10.0 — that is your internal address on your home network.

To see all the devices on your network and their internal addresses, log into your router's admin panel. The address is usually printed on the router itself or in the manual — often something like 192.168.1.1 or 192.168.0.1. You will need the router's password, which is also usually on the device or in the manual (and which you should change if you have not already).

Setting a static internal IP if you need one

If you want a device to always have the same internal address, you can set it in your router's settings. Log into your router's admin panel, find the DHCP or IP reservation section (the name varies by router brand), and create a reservation for the device's MAC address — a unique identifier printed on the device or visible in your router's connected devices list.

This is useful for devices you want to reach reliably from other devices on your network, like a printer, security camera, or NAS drive. Once you set a static IP, that device will always get the same address when it connects, and you can bookmark or remember that address.

Do not confuse this with a static external IP. A static internal IP only affects how your router talks to that device. It does not change your external IP or affect how the internet reaches you.

Frequently Asked Questions

Does my IP address change every time I restart my computer?

No. Restarting your computer does not change your IP address. Your computer keeps the same internal address from your router, and your external IP only changes if your modem restarts or your ISP's lease expires. Restarting just your computer has no effect on either.

If my external IP changes, will websites I visit know where I am?

Websites can see your external IP and use it to estimate your general location (usually to the city or region level, sometimes less accurately). A changing IP does not reveal more information — websites see your current IP each time you visit, whether it changed or not. If you want to hide your location from websites, use a VPN, which masks your external IP entirely.

Should I pay for a static external IP?

Only if you need to access a device on your home network from outside your home and you want the address to never change. For ordinary home use, a dynamic IP is fine. If you do need static access, a dynamic DNS service is usually cheaper than paying your ISP for a static IP.

Can someone hack me if my IP address changes?

No. A changing IP does not create a security vulnerability. Your router's firewall protects you whether your IP is static or dynamic. The only risk is if you have opened ports for a specific reason (like remote access) and you forget to close them — but that risk exists regardless of whether your IP changes.

What is a MAC address and how is it different from an IP address?

A MAC address is a unique identifier for your device's network card, like a serial number. An IP address is a temporary address assigned by your router or ISP. Your MAC address never changes; your IP addresses can. Your router uses MAC addresses to identify devices on your network and assign them internal IP addresses.