What "static" and "dynamic" actually mean
A static IP address is fixed. Your internet provider reserves a specific address for your connection, and it stays the same through reboots, outages and modem swaps until you cancel the arrangement. A dynamic IP address is assigned automatically from a pool of addresses the provider owns. You get whatever address is available when your router connects, you lease it for a while, and the provider is free to hand you a different one later.
The key point is that this is a property of the assignment, not of the address itself. There is nothing physically different about a static IP — it's an ordinary address that your ISP has simply promised not to change. That promise is the thing you pay for.
It also helps to keep two scopes separate. Your public IP is the address the wider internet sees, assigned by your ISP to your router. Your private IPs are the addresses your router hands to each device inside your home (usually starting with 192.168 or 10.). Both can be static or dynamic independently: setting a "static IP" on your laptop in your router's settings fixes its private address on your home network, but does nothing to your public address. This article is mostly about the public one, because that's the address the rest of the internet uses to reach you.
How dynamic IPs are assigned
When your router connects to your ISP, it asks for an address using DHCP, the Dynamic Host Configuration Protocol. The ISP's server picks an address from its pool and grants it as a lease — permission to use that address for a set period, commonly anywhere from a day to a couple of weeks. Before the lease expires, your router quietly asks to renew it, and in the overwhelming majority of cases the ISP just renews the same address.
Why your "dynamic" IP almost never changes
This surprises a lot of people: a dynamic IP can stay the same for months or even years. As long as your router stays online and keeps renewing its lease, the ISP has no reason to move you. Many home users effectively have a "sticky" dynamic IP — dynamic on paper, stable in practice. That stability is convenient, but it also means a dynamic IP is not the privacy shield people sometimes assume it is. If your address hasn't changed since spring, every website you've visited since spring has seen the same address.
When it actually does change
Your public IP typically changes when the lease genuinely lapses or the connection resets in a way the ISP treats as new: the router is powered off for a long time, the ISP does maintenance or re-arranges its network, you swap the modem or router (some ISPs tie the lease to the hardware's MAC address), or the provider deliberately rotates addresses — a few still do this daily. Rebooting your router for thirty seconds usually gets you the same address back; leaving it unplugged overnight is the classic trick for forcing a new one, though whether it works depends entirely on your ISP.
One more wrinkle: many ISPs no longer give each customer a public IPv4 address at all. With carrier-grade NAT (CGNAT), hundreds of customers share one public address, and your router only ever sees an internal one. If you're behind CGNAT, the static-vs-dynamic question is somewhat moot — you don't have your own public address of either kind, and inbound connections like port forwarding won't work regardless.
What a static IP actually gets you
A static IP matters in exactly one situation: when something on the internet needs to find you, reliably, at the same address every time. That covers more use cases than you might think.
Hosting anything at home. A game server, a website, a Plex or home-media server, a personal VPN back into your house — anyone connecting to it needs your address. If that address changes overnight, everything pointing at the old one breaks.
Remote access to your own devices. Security cameras, NAS drives, smart-home hubs and remote desktop all work far more smoothly when home has a fixed address you can dial into from anywhere.
IP whitelisting. Some corporate VPNs, databases and admin panels only accept connections from pre-approved addresses. That's only workable if your address doesn't move.
Running an email server. Mail from dynamic residential addresses is widely treated as spam on arrival; a static IP with proper reverse-DNS records is table stakes for deliverability.
Notice what's not on the list: speed. A static IP does not make your connection faster — bandwidth is a separate product, and the packets travel the same routes either way. If you're diagnosing a slow connection, a traceroute will tell you far more than your IP assignment type ever will.
The downsides of a static IP
It costs money. ISPs usually sell static IPs as an add-on, often only on business plans. Prices vary widely by provider and country, from a few dollars a month to considerably more, and IPv4 scarcity keeps nudging them upward — there simply aren't enough IPv4 addresses to give everyone a permanent one, which is a big part of why dynamic assignment and CGNAT exist at all.
You're a fixed target. A static address gives port scanners and attackers a stable, permanent location to probe. A dynamic IP doesn't make you secure — your router's firewall does that — but a static one does mean any exposed service stays findable at the same spot indefinitely. If you go static, closing unused ports stops being optional housekeeping and becomes essential.
Easier long-term tracking. Websites, advertisers and data brokers link activity by IP address. A fixed address makes that linkage trivial and permanent, and IP geolocation databases will pin it to your neighbourhood with more confidence over time.
Reputation is forever (yours to manage). If your static IP ends up on a spam blacklist — say a compromised device in your network sends junk for a week — that reputation follows the address, and cleaning it up is your problem. Dynamic users just get a different address eventually.
Which one do you have? A two-minute test
Your ISP's paperwork will say, but it's quicker to test. Check your current public IP with the GoIPScan IP lookup and note it down. Then power your router off for a few minutes — ideally longer, even overnight — turn it back on, and check again. Same address after a long power-off, every time? You very likely have a static IP or a very sticky dynamic one. New address? Definitely dynamic.
Two caveats. First, a sticky dynamic IP can survive short reboots for years, so a single quick test proves less than it seems — the reliable signal is your address changing at some point over weeks, which is why it's worth noting your IP occasionally. Second, if the address you see in the lookup doesn't match the "WAN address" your router's admin page reports, you're behind CGNAT, and the question is academic.
Do you actually need one? Usually not — try DDNS first
For most home hosting and remote-access needs, dynamic DNS (DDNS) gets you 95% of the benefit for free. A DDNS service gives you a hostname like yourname.example-ddns.net, and a small updater on your router or NAS keeps that hostname pointed at your current IP, updating automatically within minutes whenever the address changes. You connect to the name, not the number, and the occasional IP change becomes invisible. Most consumer routers and NAS boxes have DDNS support built in, and it works fine with a sticky dynamic IP.
DDNS won't help with IP whitelisting or mail-server reputation — those genuinely need a static address. And none of it helps behind CGNAT, where the fix is asking your ISP for a real public IP (some provide one on request, sometimes for a small fee) or building an outbound tunnel from inside your network.
There's also a middle path on the privacy side: several VPN providers sell a dedicated IP — a static address that belongs to the VPN server rather than your home line. You get the whitelisting-friendly stability without pinning the address to your physical location. If you're weighing that option, our VPN guide covers how these services work; and whichever way you go, it's worth confirming the setup isn't leaking your real address anyway.
Frequently Asked Questions
Is a static IP faster than a dynamic IP?
No. The assignment method has no effect on bandwidth or latency — your traffic takes the same route through the same infrastructure either way. Any speed difference you notice after switching is coincidence or a plan change, not the IP type.
Is a dynamic IP safer than a static IP?
Only marginally, and not in the way people assume. A changing address makes you a slightly less convenient long-term target for scanning and tracking, but your actual security comes from your router's firewall, closed ports and patched devices. A well-secured static IP is far safer than a carelessly run dynamic one.
How often does a dynamic IP change?
There's no universal schedule — it depends on your ISP's lease times and policies. Some rotate addresses daily; many others let the same address stick for months or years as long as your router stays online. The only way to know your ISP's behaviour is to note your IP and watch it over time.
Does restarting my router change my IP address?
Sometimes. A quick reboot usually returns the same address, because your lease is still valid. Leaving the router off for several hours or overnight makes a new address much more likely, but some ISPs tie the address to your hardware and will hand the same one back regardless. Others let you request a change through support.
Can I get a static IP on a home internet plan?
Often, but not always. Some ISPs offer static IPs as a paid add-on to residential plans; others reserve them for business tiers. If yours doesn't offer one, DDNS covers most home use cases, and a VPN with a dedicated IP covers most of the rest.
So which IP do you have right now?
Look up your current public IP in one click and note it down — check back in a week and you'll know exactly how sticky your address really is. Then scan your network to make sure nothing is exposed at it.