Virgin Media CGNAT: How to Check and Get Around It

If port forwarding is not working on your Virgin Media connection, CGNAT is one possible cause, but it is not the only one. CGNAT is not necessarily used on every Virgin Media connection, and Virgin Media UK still provides port forwarding controls on supported Hubs. So a failed port forward does not automatically mean CGNAT is the problem.

Before changing routers or trying a workaround, it is worth checking the IP address on your connection and ruling out local causes such as double NAT or firewall rules. In this guide, we will show you how to check for CGNAT on Virgin Media, what else can stop port forwarding from working, and what you can do if CGNAT is the reason.  

Open Ports Behind Virgin Media CGNAT With PureVPN

1. Log in to the Member Area and open Subscriptions.
2. Find Port Forwarding and select Configure.
3. Choose Enable specific ports and enter the ports you want to allow.
4. Select Apply Settings to save the changes.
5. Connect through the PureVPN app so the forwarding rule can take effect.

Does Virgin Media Use CGNAT?

Virgin Media does not use CGNAT across every residential connection. In the UK, customers can receive a dynamic public IPv4 address, so their connection is not necessarily behind carrier-grade NAT. Supported Virgin Media Hubs also include port forwarding controls.

However, some Virgin Media Ireland customers have reported connections using DS-Lite or CGNAT. You cannot assume CGNAT applies simply because you use Virgin Media. The best way to know for sure is to check the IP address assigned to your own connection.

How to Check If Your Virgin Media Connection Is Behind CGNAT

Before treating CGNAT as the cause, it helps to confirm whether Virgin Media is actually using it on your connection. Here is how:

Method #1: Check Your WAN IP Address

Open the connection or status page on your Virgin Media Hub or router and find the WAN or Internet IPv4 address. If it falls between 100.64.0.0 and 100.127.255.255, the address belongs to the 100.64.0.0/10 shared range reserved for carrier-grade NAT.

An address in that range is a strong indication that your connection is using CGNAT. If it falls outside this range, move on to the next check rather than ruling CGNAT out based on the WAN address alone.

Method #2: Compare Your WAN IP With Your Public IP

Use an online IP checker to see the IPv4 address websites see when you connect through Virgin Media. Turn off any VPN or proxy first, then compare that address with the WAN IP on your Hub or router.

If the addresses match and the WAN IP is not private or shared, there is no extra IPv4 NAT layer between that device and the public internet. But if they differ, another NAT layer is involved, and it may be local double NAT rather than CGNAT.

Related Read: How to Check If Your ISP Uses CGNAT

Why Port Forwarding Can Still Fail Without CGNAT

Even with a public IPv4 address, port forwarding can fail because of a problem elsewhere on the local network. Some common causes include:

• Wrong device or local IP: If the device’s local IP has changed, incoming traffic may be forwarded somewhere else.

• Nothing is listening on the port: A forwarding rule will not help if the game server, app, or other service is not running on the port you opened.

• Firewall rules are blocking traffic: Rules on the Hub, router, or destination device can stop incoming traffic even when the port forwarding rule is correct.

• Double NAT is getting in the way: Using your own router behind the Virgin Media Hub can create double NAT, which may require forwarding rules on both devices.

• Incorrect port forwarding details: The wrong port number, protocol, or destination IP can prevent the connection from reaching the intended service.

When Virgin Media CGNAT Becomes a Problem

CGNAT usually stays out of the way until you need to reach a device or service on your home network from outside. Common examples include:

Hosting Games and Game Servers

A game server can run perfectly well on your local network but still refuse connections from players elsewhere. You might configure the correct port on your router and find that CGNAT prevents outside connection attempts from reaching the server. Player-hosted games can also be affected when the game expects participants to connect directly.

Accessing Home Devices Remotely

Remote access can become frustrating when a NAS, PC, or security system works at home but cannot be reached directly while you are away. Opening the required port on your router does not solve the problem if Virgin Media is handling the connection through CGNAT. From outside the network, there is no direct public IPv4 route back to that device.

Running Self-Hosted Services

The same problem can affect anything you host yourself, from a media server or web app to a home-lab service. Everything may work as expected over the local network, while requests coming from the internet fail to reach it. A normal port forwarding rule only controls your own router, so it cannot make the service publicly reachable through an upstream CGNAT layer.

Ways to Overcome CGNAT on Virgin Media

Once you have confirmed CGNAT, there are a few ways to handle inbound access. Take a look at the table below for a quick overview of each one:

Method	Why It Works	What You Need
Public IPv4 Address	Creates a public IPv4 path for inbound traffic	Public IPv4 from Virgin Media, where available
Port Forwarding VPN	Routes supported inbound traffic through the VPN connection	VPN with port forwarding support
IPv6 Connection	Provides an IPv6 path without relying on IPv4 CGNAT	End-to-end IPv6 support + firewall control
Reverse Tunnel or VPS	Receives traffic at an external endpoint and sends it back to your local service	Reverse tunnel service or public VPS

Get a Public IPv4 Address 

Contact Virgin Media and ask whether a public IPv4 address is available for your service. A public IPv4 address gives incoming traffic a direct path to your connection, so you can use normal port forwarding on a compatible router.

A dynamic public IP is enough for port forwarding to work, although the address may change over time. Virgin Media Business includes static IP options with some broadband packages, but availability for residential services is different and needs to be checked separately.

Forward Ports Through a VPN

If Virgin Media is using CGNAT on your connection, a forwarding rule on the Hub cannot open the required port at the carrier level. A port forwarding VPN handles the inbound port on the VPN side instead and carries that traffic back to your device through the VPN connection.

This method does not depend on getting a public IPv4 address from Virgin Media, which makes it relevant when that option is unavailable. PureVPN offers a Port Forwarding add-on and lets you forward the ports you need from the Member Area.

Connect Over IPv6

If your Virgin Media connection has end-to-end IPv6 support, you can use IPv6 instead of relying on the CGNATed IPv4 path. Both the service you are hosting and the device connecting to it need to support IPv6.

However, inbound access is still controlled by firewall rules, so IPv6 does not automatically make a device or service reachable from the internet. It also does not solve the problem for anything that only supports IPv4.

Related Read: IPv4 vs IPv6: What’s The Difference Between Them?

Set Up a Reverse Tunnel or VPS

A reverse tunnel connects your network to an external endpoint. Incoming requests reach that endpoint and travel back through the tunnel to your local service, so they do not rely on Virgin Media’s CGNAT accepting a direct inbound connection.

A VPS can act as the public endpoint instead, giving you more control over how traffic is handled. The connection back to your local service can run through WireGuard or reverse SSH without relying on normal inbound IPv4 port forwarding.

Frequently Asked Questions