Why Does My IP Address Keep Changing? How to Stop It

Why your public or local IP keeps changing: DHCP leases, router reconnects, CGNAT, mobile data, VPNs, and IPv6 privacy addresses, plus how to keep one IP.

You check your IP address in the morning and it is different from yesterday. A website logs you out and asks you to confirm a "new location". The camera or game server you reach from outside stops answering because its address moved. A changing IP address is usually normal: most home and mobile connections use addresses that are leased, not owned. This guide explains every common reason your public or local IP changes, how often it happens, when it actually matters, and how to stop it, from a reservation in your router to a static IP from your provider.

The short answer

Most connections receive a dynamic IP address. The DHCP standard, RFC 2131, describes dynamic allocation as assigning an address to a client for a limited period of time, and that is how most providers hand out addresses. Your IP changes when that arrangement is interrupted or reshuffled:

• The router or modem reconnects after a restart or outage.
• The lease is not renewed in time, or your provider reorganizes its address pools.
• You switch networks, for example from Wi-Fi to mobile data, often without noticing.
• A VPN, proxy, or iCloud Private Relay gives you different exit addresses.
• On IPv6, your device rotates temporary privacy addresses on purpose, about once a day by default.

None of this means anything is wrong. If you need an address that stays put, the fixes are a static IP from your provider or dynamic DNS for your public address, and a DHCP reservation in your router for a device on your home network.

First, which IP address is changing?

"My IP keeps changing" can mean two different addresses. Your public IP is the one websites see, the address our IP checker shows. Your local or private IP, such as 192.168.1.23, is the one your router gives each device inside your home, which you see in ipconfig or the Wi-Fi settings. They change for different reasons and have different fixes; our guide to public vs private IP addresses explains the difference in detail.

Why your public IP address keeps changing

Your provider gives you a dynamic address

On most home connections the public address is leased from your provider for a set time and renewed automatically while your router stays online. By default the DHCP standard has the client start renewing halfway through the lease, so an always-on router can keep the same address for weeks or months. When the lease cannot be renewed, for example because the router was off for longer than the lease, the provider may give the address to someone else and assign you a new one.

This also explains a common surprise: restarting the router often does not change the IP. RFC 2131 tells a DHCP server to prefer the client's current address, then its previous address if it is still free, before picking a new one. A quick restart therefore usually gives you the same address back, and only a longer gap, a different device, or a change on the provider's side moves you.

Your router or modem reconnects

Power cuts, firmware updates, and line drops all start a new session with the provider. On connections that log in with PPPoE, common on DSL and some fiber services, each new session can come with a different address from the pool. Replacing your router has a similar effect: providers usually recognize the device by its hardware (MAC) address or client identifier, so new hardware looks like a new customer and receives a new lease.

You are behind carrier-grade NAT or on mobile data

Mobile carriers and many home providers share public IPv4 addresses between customers with carrier-grade NAT (CGNAT). Your traffic leaves through one address of a large pool. The IETF requirements for these systems, RFC 6888, say a CGN must by default use "paired" pooling, which keeps all of one customer's connections on the same external address while the mapping lasts. Mappings are not permanent, though. On a phone, a restart, airplane mode, or moving between parts of the network starts a new data session that can land on a different address. Our CGNAT test shows whether your home connection is shared this way, and the CGNAT IP range guide explains the 100.64.0.0/10 addresses behind it.

Your device quietly switches networks

Phones jump between Wi-Fi and mobile data when the signal drops, and each network has its own public IP. Laptops do the same between home, office, and cafe networks. Some routers fail over to a backup connection, such as a 5G modem, when the main line has a problem, and the backup has a different address. If your IP seems to change at random, note which network the device was on each time you checked.

A VPN, proxy, or iCloud Private Relay is involved

A VPN replaces your public IP with the address of the server you connect to, and that address changes whenever you pick another server or the app reconnects. Browser extensions that act as proxies behave the same way. On Apple devices, iCloud Private Relay sends Safari traffic through two relays, and Apple notes that the second relay generates a temporary IP address for the connection. If a site shows you an address from the wrong city, read our guide to iCloud Private Relay and check whether a VPN or extension is active.

Your IPv6 address rotates on purpose

If an IP checker shows an IPv6 address that changes every day, that is the design working. To stop websites from tracking a device by a fixed address, operating systems create temporary IPv6 addresses and use them for outgoing connections. RFC 8981 sets the default preferred lifetime of such an address to one day and its valid lifetime to two days, so a new temporary address takes over roughly daily. Some providers also hand out a new IPv6 prefix when the router reconnects, which changes every address in the home at once. Our guide to IPv4 vs IPv6 covers how the two families differ.

Your provider renumbers its network

Providers move customers between address pools during maintenance, when they upgrade equipment, or when they move a neighborhood onto carrier-grade NAT. These changes happen on the provider's side and can give you a new address, or a shared one, without any action from you. If your address changed and your router now shows a WAN IP in 100.64.0.0/10, you were moved behind CGNAT.

Why your local IP address keeps changing

Inside your home, the router plays the provider's role. Its DHCP server leases local addresses to every phone, laptop, and TV, and a device that leaves and returns after its lease has expired can come back with a different number. That is harmless for browsing, but it breaks port forwarding rules and printer settings that point at a fixed local address.

Phones add another twist. Apple devices use a private Wi-Fi address, a randomized hardware address, instead of the real one, and when the option is set to Rotating, Apple says the private address changes to a different one every two weeks. Android randomizes Wi-Fi addresses too. To the router, a phone with a new hardware address looks like a new device, so it can receive a new local IP. If you need a stable local address for a phone, switch the private address setting to Fixed for your home network before you reserve an address for it.

The fix for local addresses is a DHCP reservation: you tell the router to always give one device the same address. It lives in the router admin page, usually under LAN, DHCP, or address reservation; our router login guide shows how to get in. To see and renew a device's current lease, follow the steps in our guides for Windows and Mac.

Lily's address check

Track what your address is doing

Note your public IP and whether your router WAN IP is shared before you change anything. A WAN IP in 100.64.0.0/10 means carrier-grade NAT, which changes which fixes will work.

Check your public IPTest for CGNAT

How often does an IP address change?

There is no fixed schedule, because the answer depends on how your provider runs its network and on what happens to your connection. As a rough guide:

• Home broadband with an always-on router: often the same public IPv4 address for weeks or months, because the router renews its lease long before it runs out.
• DSL and fiber with PPPoE: potentially a new address after every reconnect, depending on the provider.
• Mobile data: frequently a different public address after a restart, airplane mode, or a long idle period.
• IPv6 temporary addresses: a new one roughly every day by default, by design.
• VPN and relay services: whenever you reconnect or switch servers, and sometimes during a session.

To measure your own connection, check your public IP at the same time each day for a week, and look at the WAN or Internet status page in your router, which often shows the lease time and when it was granted.

When a changing IP address is a problem

For browsing, streaming, and almost every app, a new address makes no difference. It starts to matter in a handful of situations:

• Reaching your home from outside. Cameras, a NAS, a game server, or remote desktop all need an address that stays the same, or a name that follows it. If you are behind CGNAT, inbound connections fail no matter what the address is; our guide on port forwarding under CGNAT covers the realistic options.
• Allowlists. Work systems, admin panels, cloud firewalls, and some school or bank services only accept known addresses. A new IP locks you out until someone updates the list.
• Security prompts. Banks, email providers, and streaming services may ask you to confirm a sign-in from a new address. That is normal and not a sign of an attack.
• Inherited reputation. A new address can carry someone else's history and trigger blocks or captchas; our guide to blocked IP addresses explains what to do. The reverse also happens: a new address can lift a block that was tied to the old one.
• Location. Different addresses can geolocate to different cities, which changes local search results and content; see why IP location is often wrong.

How to stop your IP address from changing

Ask your provider for a static IP

A static IP is an address reserved for your connection that does not change. Many providers offer one on business plans or as a paid add-on to residential service, and some will move a customer off CGNAT to a public address on request. When you ask, be specific: say you need a static public IPv4 address, and if your router shows a WAN IP in 100.64.0.0/10, say you are behind CGNAT and need a public address. Our ISP directory has pages for many providers to start from.

Use dynamic DNS instead

If you only need to reach your home from outside, you may not need a fixed address at all. Dynamic DNS gives you a hostname, and your router or a small app updates it whenever your public IP changes, so the name always points home. Many routers support it in their settings. It only works with a real public address, though: behind CGNAT the hostname points at a shared address that will not forward connections to you.

Keep your current lease alive

Because DHCP servers prefer to give a client its previous address, simple habits keep the same IP for longer: leave the router and modem powered on, put them on a small UPS if power cuts are common, and avoid swapping hardware unnecessarily. If you replace your router and your provider ties the lease to the old device, some routers can copy the old WAN hardware address, often called MAC cloning, which lets the provider recognize the connection as the same customer.

Reserve addresses on your home network

For local addresses, a DHCP reservation in the router is the clean fix, and it is better than typing a static IP into the device, because the router keeps track of it and avoids conflicts. Reserve addresses for printers, a NAS, cameras, game consoles, and anything you forward ports to.

Use a dedicated IP from a VPN

If your provider cannot give you a static address, which is common on mobile and CGNAT connections, a VPN dedicated IP is the workaround for allowlists. Unlike normal VPN servers, where many users share and rotate addresses, a dedicated IP is assigned to you alone and stays the same every time you connect, so a work system or admin panel can allowlist it once. It gives you a stable outgoing address; it does not make your home reachable from outside.

Frequently asked questions

Is it normal for my IP address to change?

Yes. Most home and mobile connections use dynamic addresses that are leased for a limited time, so a change after a restart, an outage, or a network switch is expected. It only matters if you host services or rely on an allowlist.

Why does my IP address change every day?

If it is an IPv6 address, temporary privacy addresses rotate about once a day by default. If it is IPv4, your connection may reconnect daily, you may be switching between Wi-Fi and mobile data, or a VPN or relay may be giving you new exit addresses.

Why did my IP not change after restarting the router?

DHCP servers are told to prefer giving a client its current or previous address, so a short restart usually returns the same IP. A longer outage, new hardware, or a change on the provider side is more likely to move you.

Can I keep the same IP address without paying for a static IP?

Often, yes in practice. Leaving the router online keeps the lease renewed, dynamic DNS keeps a hostname pointing at your current address, and a DHCP reservation fixes local addresses. Only a static IP is guaranteed not to change.

Does a changing IP address mean I have been hacked?

No. Address changes are routine. Be suspicious only if your IP suddenly shows another country and you are not using a VPN, Private Relay, or a proxy extension. In that case, check your browser extensions and router settings.

Can a dynamic IP address be traced?

Yes. Providers usually keep records, for a period, of which customer used which address at which time, so a dynamic address can be traced through the provider with a legal request. Our guide on what someone can find from your IP explains the limits.

Does a VPN give me a static IP?

Not by default. Normal VPN servers share addresses between many users and you get a different one when you switch servers. Some VPNs sell a dedicated IP add-on that stays the same every time you connect.

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By Tudor Uzun

Founder and Senior Software Engineer, IP Trackers

Published October 2, 2026Editorial standards