Using your home IP abroad: how it works

How do websites and apps know where you are?

Mostly from your IP address. Every connection carries the public IP address of the line it runs through. Services look that address up in geolocation databases, which map it to a country and often a region. They also use other signals: GPS, Wi-Fi positioning, your time zone and the details stored in your account.

An IP address doesn’t contain a location. Geolocation databases map address ranges to countries, regions and cities, partly using data from network operators. The IETF format for such geolocation feeds deliberately allows only coarse locations and warns that errors can occur at many levels. The result is an estimate.

When you join the hotel Wi-Fi in Lisbon, your traffic runs through the hotel’s connection. Websites see its Portuguese IP address and assume you are in Portugal.

Phones and tablets combine cellular, Wi-Fi, GPS and Bluetooth to find their position, as Apple explains for its devices. Any app you allow to use your location therefore knows where you are, whatever your IP address.

Why do people want their home IP when abroad?

Because many services behave differently when you suddenly connect from another country. Common reasons are extra security checks in online banking, German catch-up TV with content that isn’t available abroad, work tools with access restrictions, and wanting to reach the NAS, printer or smart-home devices on your home network.

• Banking and accounts: Banks and other services check logins for unusual patterns. A login from another country can trigger an extra confirmation step or a temporary block. Our guide to online banking abroad covers this in detail.
• Catch-up TV and streaming: Not all content can be watched abroad (see the note below). More in our guide to German catch-up TV abroad.
• Work: Some company systems only accept connections from certain networks or countries. Whether you may work from abroad is for your employer to decide, not the technology – see our guide to working abroad.
• Home network: A NAS, printer, cameras or smart-home devices are often only reachable from inside your own network.
• Unfamiliar Wi-Fi: When your traffic runs through an encrypted tunnel to your home, others on the same hotel or café Wi-Fi can’t read it.

How does your home IP get abroad?

Through an encrypted tunnel. A device on the road connects to a counterpart at home, such as your router, a small server or a second box. Your traffic travels through this tunnel to your home and only goes out to the internet from there. That’s why websites see your home IP address, not the hotel’s.

1. On the road, your laptop or a travel router connects to the local network, for example the hotel Wi-Fi.
2. It builds an encrypted VPN tunnel to the counterpart at your home, these days often using the WireGuard protocol.
3. Your traffic goes out to the internet through your home connection. Replies take the same route back.

The catch: your home connection has to be reachable

In the classic setup, your device dials straight into your router at home, so your line must be reachable from the internet. DS-Lite and CGNAT, which are common on many cable and fibre lines in Germany, take away your own public IPv4 address. GL.iNet’s guide to setting up a WireGuard server says accordingly that a router without a public IP address can’t be set up as a WireGuard server. A workaround via IPv6 only helps if the network you’re on abroad offers IPv6 too. Our guide to DS-Lite explains the background.

There is another route for these lines: both ends dial out to a relay server that joins them together. That’s how the Homvoya Kit works: the home box and the travel box each connect, encrypted, to a relay server in the EU. The content of your traffic isn’t logged, and websites still see your home IP rather than the server’s address.

VPN app, DIY setup or ready-made kit: what’s the difference?

A VPN app with a German server is quick to set up but shows a data-centre IP, not your own. DIY with a FRITZ!Box, your own server or a travel router gives you your real home IP but needs know-how and usually a reachable line. A ready-made kit gives you your home IP without setup, even on DS-Lite.

For many people, a VPN on their own FRITZ!Box is the obvious first try. Our guide to the FRITZ!Box VPN covers what you need and where it hits its limits.

Which option is the better choice for you?

A VPN app is enough if any German IP will do, you need lots of bandwidth or your upload at home is weak. DIY makes sense if your line is reachable and you enjoy setting things up. A ready-made kit fits if you want your own home IP without any setup, including on a DS-Lite line.

A VPN app is better if …

• you don’t need your own home IP, just a German address or protection on hotel Wi-Fi.
• your upload at home is below 10 Mbit/s, or you need a lot of bandwidth on the road.
• you’re away for a long time and nobody at home can restart the router and counterpart if something fails.

DIY is better if …

• your line has a public IPv4 address and your router already supports VPN – then it costs next to nothing.
• you like setting things up yourself, installing updates and troubleshooting.
• you mainly want to reach your home network from a laptop or phone.

A ready-made kit makes sense if …

• your line uses DS-Lite or CGNAT and has no public IPv4 address.
• you can’t install apps on a device, such as a work laptop. You still need to agree working from abroad with your employer first.
• several devices should use your home IP, including a smart TV or games console.

What can’t a home IP do?

A home IP only changes the address websites see. It doesn’t hide GPS, Wi-Fi positioning or your time zone, it’s never faster than your upload at home, and it stops working if your internet at home goes down. It doesn’t guarantee access to any particular service and doesn’t change the rules on work or streaming.

• Other location signals remain: GPS, Wi-Fi positioning, time zone and account details can still show where you are. Services may also run their own checks.
• Speed: Your home connection’s upload is the ceiling for your speed on the road. The hardware sets limits too: for the GL.iNet Opal in the Homvoya Kit, the manufacturer states up to 65 Mbit/s WireGuard throughput (lab test).
• Depends on home: If the internet or power at home fails, the connection stops working. Your router and the counterpart at home have to stay on.
• Local networks: Some hotel or corporate networks block encrypted connections.